1472636232

6
MACHINE DESIGN-I
SUBJECT CODE : 337551 (37)
CSVTU PREVIOUS YEARS QUESTION PAPERS
Nov-Dec 2007
6-1
Apr-May 2008
6-3
Nov-Dec 2008
6-5
Apr-May 2009
6-7
Nov-Dec 2009
6-9
Apr-May 2010
6-12
Nov-Dec 2010
6-14
Apr-May 2011
6-17
Nov-Dec 2011
6-19
Apr-May 2012
6-21
Nov-Dec 2012
6-23
Apr-May 2013
6-25
Nov-Dec 2013
6-27
Apr-May 2014
6-30
Nov-Dec 2014
6-32
Apr-May 2015
6-33
Nov-Dec 2015
6-37
SCHOLARSHIP TEST
FOR GATE 2018 ASPIRANTS
Test Pattern
Test Date
th
18 Sep. 2016
30 Questions
50 Marks
90 Minutes
RAIPUR
9630520016
BHILAI : PLOT NO. A-213, STREET NO.-27,NEAR CANARA BANK, SMRITI NAGAR, BHILAI
RAIPUR :
SARASWATI SHIKSHA MANDIR, NEAR TIKARAPARA POLICE STATION, SANTOSHI NAGAR, RAIPUR
MECHANICAL ENGINEERING
CIVIL
MECHANICAL
NEW BATCHES FOR
GATE 2018
STARTING ON
29TH AUG. 2016 - BHILAI
15TH SEP. 2016 - RAIPUR
BHILAI
RAIPUR
0788-6499334
9630520016
BHILAI : PLOT NO. A-213, STREET NO.-27,NEAR CANARA BANK, SMRITI NAGAR, BHILAI
RAIPUR :
SARASWATI SHIKSHA MANDIR, NEAR TIKARAPARA POLICE STATION, SANTOSHI NAGAR, RAIPUR
CSVTU PREVIOUS YEARS QUESTION

PAPERS
|6-1
Nov-Dec 2007
UNIT-1
Q.1
Explain the following terms:
(i) Design stress (ii) Factor of safety
Ans. Refer Q. No.1.3 in Unit 1.

Q.2
(i)
(ii)
A steel shaft is subjected to a constant

bending moment of 10 kN-m and a constant
torque of 35 kN-m. Using a factor of safety
equal to 2.0 determine the diameter of shaft
applying Distortion energy theory of failure
and a maximum shear stress theory of failure.
Yield point stress = 700 MN/m2.

Q.3
Design a roller chain drive to connect a 15 kW 1500

rpm electric motor to a centrifugal pump running at
750 rpm. The service conditions involve moderate
shocks.
(i)
What steady load P can be applied on a

cylindrical bar shown in below figure without
exceeding yields strength of material at notch
root. The value of ultimate stress=600
N/mm2.
Taking notch sensitivity into action, find the value of

P which can be applie without exceeding endurance
limit of material. Steel-annealed & normalized.
If the value of in fluctuates between 2 F and 4 F, find

the value of F. Apply soderberg equation with factor
of safety = 2.0 surface of bar is matched
(ii)
Select a proper roller chain and give a list of

its dimensions.
Determine the pitch circle diameters of

driving and driven sprockets
(iii) Determine the number of chain links
(iv) Recommend the correct centre distance

between the axes of sprockets.
The conditions of operations are: Constant load,
fixed centre distance, continuous lubrication
continuous running.
Ans. Not in Syllabus.
65
UNIT-2
Q.1
Prove that a square key is equally strong in shear

and compression.

Q.2
Design a knuckle joint (with fork and eye) to

withstand a load of 10000 N. The material used for
all components have the following properties:
Ultimate tensile strength = ultimate compressive
strength = 480 N/mm2; shear strength = 360
N/mm2, FOS = 6.
Q.3
Design a cotter joint to carry a maximum load of

50000 N. All the components are made of the same
material having the following stress:
Tensile stress = 20 MN/m2, Compressive stress = 50
MN/m2
Shear stress = 15 MN/m2.
Ans. Refer Q. No. 2.12 in Unit 2..

.
FOR DESCRIPTIVE SOLUTION REFER GATEMENTOR PUBLICATION (MACHINE DESIGN - I) BOOK FOR CSVTU
6-2|MACHINE DESIGN
-I
UNIT-3
Q.1
between bolts 1 and 2 is 200 mm, and the centre

distance between bolts 1 and 3 is 150 mm. All the
bolts are identical. The bolts are made from plain
carbon steel 30C8 (Syt = 400 N/mm2) and factor of
safety is 2.5. Determine the size of the bolts
Differentiate between a bolt and tap bolt.
Ans. A bolt is a threaded fastener mated with a nut. One

end mates with a tapped component and the other
with a standard nut
Q.2
A tap bolt is a bolt with a head on one end and a

thread on the other end, to be screwed into some
fixed part, instead of passing through the part and
receiving a nut.
A screw jack is to lift a load of 80 KN through a
higher of 400 mm. The elastic strength of screw
material in tension and compression is 200 MPa and
in shear 120 MPa. The material for the nut is
phosphor-bronze for which the elastic limit may be
taken as 100 MPa in tension, 90 MPa in
compression and 80 MPa in shear. The bearing
pressure between the nut and the screw is not to
exceed 18 N/mm2. Design and draw the screw jack.
The design should include the design of:
(i) Screw
Ans. Refer Q. No. 4.12 in Unit 4.

Q.4
(ii) Nut
(iii) Handle and cup (iv) Body

Q.3
Q.1
The structural connection shown in figure is

subjected to an eccentric force P of 10 kN with an
eccentricity of 500 mm. The centre distance
A bolted joint is used to connect two components.

The combined stiffness of the two components is
twice the stiffness of bolt. The initial tightening of
nut results in a pre-load of 5 kN in the bolt. The
external force of 10 kN creates further tension in
bolt. The bolt is made of plain carbon steel 30C8
with yield point stress in tension = 400 N/mm2 and
factor of safety is 3. There are coarse threads on the
bolt. Determine the size of bolt.
Ans. Refer Q. No. 4.17 in Unit 4
UNIT-4
Define the efficiency of riveted joint.

Q.2
A rectangular cross-section bar is welded to a

support by means of fillet weld as shown in figure.
Determine the size of the welds if the permissible
shear stress in the weld is limited to 75 MPa.

Q.3
Design a double riveted butt joint with two cover

plates for the longitudinal seam of a boiler shell 1.5
m in diameter subjected to a steam pressure of 0.95
N/mm2. Assume joint efficiency as 75%, allowable
tensile stress in the plate 90 MPa, compressive
stress 140 MPa and shear stress in the rivet 56 MPa.
MECHANICAL eryc GATEMENTOR

PAPERS
|6-3
UNIT-5
Q.1
Explain the difference between design of shaft

based on:

Q.3

Q.2
A machined surface shaft carries a completely

reversed bending moment of 3 kN-m and a torque
of 10.8 kN-m. The stress concentration factor for
bending and torsion is 1.35. Take factor of safety =
2.0.
The
ultimate
strength
of
material
2
2
u 825 N / mm ; yield strength yt 610 N / mm .
Calculate the diameter of shaft based on maximum
shear stress theory of failure. Neglect notch
sensitivity.
Design a clamp muff coupling to transmit 30 kW at

100 rpm. The shaft and key are made of 40C8 steel
having tensile yield strength = 320 N/mm2. There
are six bolts connecting the two halves of the
coupling. The bolts are made of 45C8 steel having
tensile yield stress of 350 N/mm2. Take factor of
safety = 4 and coefficient of friction between muff
and surface = 0.3.
Apr-May 2008
UNIT-1
Q.1
A plate made of steel 20 C8 ut 440 N / mm 2 in
Q.2
hot-rolled and normalized condition is shown in

below figure. It is subjected to a completely
reversed axial load of 30 kN. The notch sensitivity
factor q can be taken as 0.8 and the expected
reliability is 90% the factor of safety is 2. Determine
the plate thickness for infinite life.
(i)
(ii)
(v)
10
Q.1
Specify the correct centre distance.
Ans. Not in syllabus.

.
UNIT-2
Design a knuckle joint for a tie rod of a circular

section to sustain a maximum pull of 70 kN. The
ultimate strength of the material of the rod against
tearing is 420 MPa. The ultimate tensile and
shearing strength of the pin material are 510 MPa
an 396 MPa respectively. Determine the tie rod
section and pin section. The factor of safety = 6??
Select a proper roller chain
(iv) Determine the number of chain links
50
Specify the number of teeth on the driving and

driven sprockets.
(iii) Calculate the pitch circle diameters of driving

and driven sprockets
30kV
30kN
It is required to design a chain drive with a duplex

chain to connect 15 kW, 1400 rpm electric motor to
a transmission shaft running at 350 rpm. THe
operation involves moderate shocks.
Q.2
Design an draw (sketch) a cotter joint to support a

load varying from 30 kN in compression to 30 kN in
tension. The material used is carbon steel for which
the following allowable stresses may be used. The
load is applied statically.
Tensile stress = Compressive stresses = 50 MPa;
Shear stress = 35 MPa and Crushing stress = 90

MPa.
6-4|MACHINE DESIGN
-I
UNIT-3
Q.1
A steel plate subjected to a force of 3 KN and fixed

to a vertical channel by means of four identical bolts
as shown. The bolts are made of plain carbon steel
45C8 with yt 380 N / mm2 If FOS = 2. Determine

the diameter of bolts.
Ans. Refer question 4.11 in unit 4

Q.3

Q.2
A sluice valve used in water-pipelines, consist of a

gate raised by the spindle, which is rotated by the
hand wheel. The spindle has single-start square
threads. The nominal diameter is 36 mm, and the
pitch is 6 mm. The inner and outer diameters of the
friction collar are 30 mm and 50 mm respectively.
The coefficients of friction at the threads and the
collar are CI. 15 and 0.20 respectively. The weight of
the gate is 7.5 kN, and the frictional resistance to
open the valve due to water pressure is 2.5 kN.
Using the uniform wear theory for collar friction,
calculate:
A steel plate subjected to a force of 8 kN is fixed to a

channel by means of these identical bolts as shown.
The bolts are made of 45C8 (Syt = 380 N/mm2). IF
the required FOS=2.5 Determine the size of the bots.
(i)
(ii)
The torque required to raise the gate and

The overall efficiency of the mechanism
UNIT-4
Q.1
A steam boiler is to be designed for a working

pressure of 2.5 N/mm2 with its inside diameter 1.6
m. Give the design calculations for the longitudinal
and circumferential joints for the following working
stresses for steel plates and rivets:
In tension = 75 MPa, In shear = 60 MPa, In crushing
= 125 MPa.

Q.2
A welded connection of steel plates, as shown in

figure is subjected to an eccentric force of 10 kN.
Determine the throat dimension of the weld if the
permissible shear stress is limited to 95 N/mm 2.
Assume static condition.

PAPERS
|6-5
UNIT-5
Q.1
An intermediate shaft of a gear box, supporting two

spur gears A and B and mounted between two
bearings C1 and C2 shown in below figure. The pitch
circle diameters of gears A and B are 500 and 250
mm respectively. The shaft is made of alloy steel 20
MnCr5
ut
620 N / mm 2 and yt N / mm 2 . The
factors Kb and Kt of the ASME code are 2 and 1.5

respectively. The gears keyed to the shaft.
Determine the shaft diameter.

Q.2
Design a protective type of cast iron flange coupling

for steel shaft transmitting 15 kW at 200 rpm and
having an allowable shear stress of 40 MPa. The
working stress in the bolt should not exceed 30
MPa. Assume that the crushing stress is twice the
value of its shear stress. The maximum torque is
25% greater than the full load torque. The shear
stress for cast iron is 14 MPa. Same material is used
for shaft and key
Nov-Dec 2008
UNIT-1
Q.1
Ans. Refer question 1.44 in Unit 1.
Define stress concentration factor.
Q.3

Q.2
A cantilever beam made of cold drawn steel

as
40 C 8 Sut 600 N / mm 2 and S yt 380 N / mm 2
shown below. the force P acting at the free end

varies from 50 N to 150 N . The expected
reliability is 90% and the FOS = 2. The notch
sensitivity factor at the fillet is 0.9. Determine the
diameter "d" of the beam at the fillet crosssection.
It is required to design a chain drive connect a 5 kW,

100 rpm electric motor to drilling machine. THe
speed reduction is 3:1. The centre distance should
be approximately 500 mm.
(i) Select a proper roller chain for the drive
(ii) Determine the number of chain links
(iii) Specify the correct centre distance between the

axes of sprockets.
Ans. Not in syllabus
P 50 N 150 N
+
0
8 s
t
s
Te 0/Original Virtual Calculator
100
STARTS ON
ST
1 SEPTEMBER
6-6|MACHINE DESIGN
-I
UNIT-2
Q.1
What are the functions of key?
Q.3

Q.2
It is required to design a knuckle joint to connect

two circular rods subjected to an axial tensile force
of 50 KN. The rods are co-axial and a small amount
of angular movement between their axes is
permissible. Design the joint and specify the
dimensions of its components. Select a suitable
material for the parts.
It is required to design a cotter joint to connect two

steel rods of equal diameter. Each rod is subjected
to an axial tensile force of 50 KN. Design the joint
and specify its main dimensions
UNIT-3
Q.1
What are the types of threads for power screws?.

Q.2
Design a screw jack to lift a load of 100 kN through a

height
of
300
mm.
Assume
u 400 MPa, u 200 MPa, y 300 MPa,
b 10 MPa The outer diameter of the bearing

surface is 1.6 d1 and inner diameter of bearing
surface is 0.8 d1, coefficient of friction between the
collar on screw and C.I. cup is 0.2. The co-efficient of
friction between the steel screw and bronze nut is
0.15. Take factor of safety of 5 of screw and nut but
a factor of safety for the operating lever as 2.5.

Q.3
Q.1
A wall bracket is attached to a wall by means of four

identical bolts, two at A and two at B as shown in
figure. Assuming that the bracket is held against the
wall and prevented from tipping about point C by all
four bolts and using an allowable tensile stress in
the bolts as 35 N/mm2, determine the size of the
bolts on the basis of maximum principal stress
theory.

.
UNIT-4
What are the different types of welding methods

used in fabrication work?

Q.2


PAPERS
|6-7
Use the following data
Permissible tensile stress for the boiler shell = 90

N/mm2
Permissible shear stress for rivet / shell = 56

N/mm2
Permissible compressive stress for the rivets /
holes = 140 N/mm2

Q.3
Q.1

plates for a longitudinal seam of a boiler shell
having 0.75 m internal diameter the maximum
steam pressure inside the boiler is 1.55 N/mm2.
What is the function of transmission shaft?

Q.2
A transmission shaft with a uniformly distributed

load of 10 N/mm is shown in figure (a). The
maximum permissible deflection of the shaft is
(0.003L), where L is the span length. The modulus
of elasticity of the shaft material is 207000 N/mm 2.
Determine the shaft diameter by Castiglianos
theorem.
Efficiency of double riveted longitudinal butt joint =

75%
UNIT-5
Q.3
A rigid coupling is used to transmit 50 KW power at

300 rpm. There are 6 bolts. The outer diameter of
the flange is 200 mm. The coefficient of friction
between the flanges is 0.15. The bolts are made of
steel 45 C8(Syt=380 N/mm2) & FOS = 3. Determine
the diameter of the bolts. Assume that the bolts are
set in large clearance holes. The recess diameter is
150 mm..
Apr-May 2009
UNIT-1
Q1.
What are the advantages and disadvantages of chain

drive?.
distance is around 450 mm. The compressor

operates for 16 hours per day.
Q.2
Q.3
A 12 KW electric motor running at 1200 rpm. The

compressor speed is around 350 rpm. The centre
What are the steps to be followed while designing a

chain drive?
6-8|MACHINE DESIGN
-I
Q.4
Q1.
A chain drive has some features of belt drive and

some of the gear drive. Explain
What is the purpose of using a gib along with a
cotter in a cotter joint?

Q.2
Two steel rods are to be connected by means of a

steel sleeve and two steel cotters. The rods are
subjected to a tensile load of 40 KN. Design the joint.
The
permissible
stress
in
tension,
may
be
50 MPa, t 60 MPa, c 90 MPa
assumed.
Ans. Refer question 2.14 in Unit 2..

Q.3
Q.1
Define critical resolved shear stress. How is it

calculated? Explain
UNIT-2
Q.4
An automobile engine has a capacity of 250 N-m.

The clutch is attached to its driven shaft by means
of six splines that is to slide when not under load.
Determine the dimensions of the shaft and spline.
The material of the shaft and splines is steel and the
load is applied with a moderate shock. The
maximum pressure on the spline is 8.5 N/mm2.
Assume length of the spline 1.5 times the shaft
diameter
UNIT-3
What is meant by screwed fastener and what are

the applications of screwed fasteners?.
Q.2. A steam engine cylinder of 300 mm effective

diameter is subjected a steam pressure of 1.5
N/mm2. The cylinder head is connected by means of
8 bolts having yield strength of 320 MPa and
endurance limit of 240 MPa. The bolts are tightened
with an initial preload of 1.5 times that of steam
load. A soft copper gasket is used to make the joint
leak proof. Assuming a fatigue stress concentration
factor of 1.4 and factor of safety of 2; determine the
size of the bolts required..
Q.3
dC
Figure shows a screw clamp and nut, calculate : (a)

The diameter of the screw, (b) The height of the nut
and (c) The dimensions of the handle, for maximum
clamping force Fc 20 KN force at the end of the
level arm = 200 N=W, allowable compressive stress
for screw = 80 MPa c , Bearing pressure of screw
and nut Pb 20 MPa, coefficient of friction between
screw and nut threads 0.15 Friction torque of
pad T2 40 N m , allowable bending stress for

handle b 90 MPa .

PAPERS
|6-9
UNIT-4
Q.1
Which type of joint used for longitudinal joint of a

boiler and why?

Q.2
Q.1
A boiler is made by welding the plates

longitudinally and circumferentially as shown in
figure. The diameter of the boiler is 1m. The
maximum pressure is 1.5 N/mm2. Design both the
joints, using single-V butt weld for both the joints.
The permissible tensile stress in the plate material
is 70 MPa. Also assume the strength of the plate and
weld is the same.
1000
UNIT-5
What are the purposes in machinery for which

couplings are used?

Q.3

Q.2
It is required to design a bushed pin type of flexible

coupling for connecting the motor and centrifugal
pump shaft. The details of the duty required from
the pump are:
Enumerate the cases of shaft failure

differentiate between a shaft and an axle?
and
A transmission shaft with keyways is subjected to a

maximum torsional moment of 750 N-m, and
maximum bending moment of 1200 N-m. The leads
are suddenly applied, minor shocks are
encountered and the allowable shear stress is 42
MPa. Find the shaft diameterl.
Power to be transmitted = 18.5 kW
Speed of revolution/minute = 1000
Ans. Refer Q. No. 3.1,3.3 & 3.15 in Unit 3.
The diameter and pump shafts are 50 mm and 45

mm respectively. Take the bearing pressure on the
rubber bush as 0.35 N/mm2 and the work shearing
stress in the materials of the pins as 20 N/mm2.
Nov-Dec 2009
UNIT-1
Q.1
Explain factor of safety, notch sensitivity.
Ans. Refer question 1.3 & 1.17 in Unit 1.

Q.2
A flat plate subjected to a tensile force of 5 KN is

shown. The plate material is grey cast iron FG 200
and FOS 2.5 . Determine the thickness of the
plate.
Q.3 A cantilever beam made of cold drawn steel

as
6-10|MACHINE DESIGN
-I
diameter "d" of the beam at the fillet cross-section.
Ans. Not in syllabus.

Q.4
P 50 N 150 N
How do you accommodate the effect of keyway on a

shaft?
A standard spline connection 8 52 60 mm is used

for the gear and the shaft assembly of a gear box in
20 KW power at 300 rpm is transmitted by the
splines. The dimension of the splines are,
D 60 mm, d 52 mm and Pb 6.5 N / mm 2 ,
0.06. Find:

Q.4
compressor operates 16 hrs/day. Design a suitable

chain
A compressor is to be actuated from a 10 KW

electric motor. The speed of the motor shaft is 1000
rpm and the compressor speed being 350 rpm. The
minimum centre distance is 500 mm. The
(i)
(ii)
The length of the hub of the gear
The force required to shift the gear
UNIT-2
Q.1
Differentiate the temporary joint and permanent

joint give examples.

D 60 mm, d 52 mm and
Pb 6.5 N / mm 2 ,

Q.2
Design a cotter joint to support a load of 80 KN in

the allowable stresses may be taken as
t 60 MPa, 40 MPa, c 100 MPa respectively.
Go for socket and spigot cotter joint.
0.06. Find:
(i) The length of the hub of the gear

Q.3
Design a knuckle joint to transmit 150 KN, the

design stress may be taken as 75 MPa in tension, 60
MPa in shear and 150 MPa in compression.

Q.4
Q.1

shaft?
(ii) The force required to shift the gear.
Ans. Refer question 2.34 in Unit 2 .
UNIT-3
What are different types of stresses set up in bolts

due to initial tightening?

Q.2
A steel bracket shown is secured to a wall by means

of four steel bolts. The load on the bracket is 15 KN
which acts at a distance of 175 mm from the wall.
Determine the size of the bolt.

PAPERS
|6-11
Q.3

(i) Screw
(iv) Body
UNIT-4
Q.1
Classify the rivets. What is throat of weld?
Ans. Refer Q. No.5.21 & 5.2 in Unit 5.

Q.2

(ii) Nut
(iii) Handle and cup

Q.4
A bracket carrying a load of 15 kN is to be welded as

shown in figure. Find the size of the weld required if
the allowable shear stress is not to exceed 80 MPa.

Q.3
A bracket is riveted to a column by 6 rivets of equal

size. It carries a load of 100 KN at a distance of 250
mm from the column if, 63MPa , find the
diameter of the rivet.
.
UNIT-5
Q.1
What are the materials for the shaft?

Q.2
A shaft supported on bearings 900 mm apart,

receives power through a pulley of 450 mm
diameter, which over hangs the right bearing by

200 mm. A shaft transmits power through a pulley
of 250 mm diameter, which is located mid way
between the bearings. The belt drives are at right
angle to each other. The ratio of tension in both the
6-12|MACHINE DESIGN
-I
belts is 3:1 and maximum tension in both the belts
is limited to 200 N. If the permissible tensile and
shear stresses are 100 N/mm2 and 60 N/mm2
respectively. Determine the diameter of shaft.
250
Shear stress for shaft, bolt and key material = 40

MPa
Crushing stress for bolt and key = 80 MPa
Shear stress for cast iron = 8 MPa:
450
FB2
FB1
FA1
FA2

Q.2
Design a cast iron protective type flange coupling to

transmit 15 KW at 900 rpm from an electric motor
to a compressor. The service factor may be assumed
is 1.35. The following permissible stress may be
used:
Apr-May 2010
UNIT-1
Q.1
Define factor of safety and notch sensitivity.
Q.3

Q.2
Ans. Refer similar question 1.44 in Unit 1
A cantilever beam made of cold drawn steel 20C8 is

subjected to a completely reversed load of 10000 N
as shown. The notch sensitivity factor at the fillet
can be taken as 0.85 and the expected reliability is
90%. Determine the diameter d for the beam for a
life of 10000 cycles in figure.
P 1000 N
A transmitting shaft of cold drawn steel C 30 is

subjected to a fluctuating torque which varies from 100 Nm to +400 Nm. The factor of safety is 2 and
the expected reliability is 90%. Neglecting the effect
of stress concentration, determine the diameter of
the shaft. assume distortion energy theory of failure.

Q.4
A blower is to run at 600 rpm. Power the blower is

available from a motor rated at 8 kW at 1500 rpm.
Design a chain drive for the system approximate
center distance is 800 mm..

.

PAPERS
|6-13
UNIT-2
Q.1 What is the difference between key and splines.
Q.2
D 60 mm, d 52 mm and Pb 6.5 N / mm 2 ,

0.06. Find:

shaft?
(i) The length of the hub of the gear
(ii) The force required to shift the gear.
Ans. Refer Q. No. 2. 3 & 2.4 in Unit 2.

Q.3

Ans. Refer Q. No.2.15,in Unit 2.
UNIT-3
Q.1
What is initial tension in a bolt, what I force

deformation diagram for bolted joint?

Q.2
A casting weighing 30 KN is lifted by means of an

eye bolt of 30 mm nominal diameter. The bolt
extends 40 mm into the casting. Determine the
direct tensile and shear stresses in the threaded
portion of bolt.

Q.3

theory.
Ans. Refer Q. No.4.8 in Unit 4..

Q.4

(i) Screw
(iv) Body.
(ii) Nut
UNIT-4
Q.1
What are the modes of failure of a riveted joint?

Q.2
A double riveted double cover butt joint in plates 20

mm thick is made with 25 mm diameter rivets at
100 mm pitch. The permissible stresses are:
st 120 MPa, 100 MPa, c 150 MPa

Find the efficiency of joint, taking the strength of the
rivet in the double strength of the rivet in the
double shear as twice than that of the single shear.:
6-14|MACHINE DESIGN
-I
Q.3


Q.4
A rectangular steel plate is welded as a cantilever to

a vertical column and supports single concentrated
load P as shown in figure. Determine the weld size if
shear stress in the same is not to exceed 140 MPa.
UNIT-5
Q.1
How axles are different than shaft. What are the

requirements for the shaft dewsign?
Ans. Refer Q. No. 3.1 & 3.2 in Unit 3.

Q.2
A transmission shaft supporting a spur gear B and

the pulley D. The shaft is mounted on two bearings
A and C. The diameter of the pulley an the pitch
circle diameters of the gear are 450 mm and 300
mm respectively. The pulley transmits 20 KW
power at 500 rpm to gear P1 and P2 are belt
tensions in the tight and loose sides, while P t and Pr
are tangential and radial components of gear tooth
force. Assume, P1 3P2 and Pr Pt tan 20 0 The gear
and pulley are keyed to the shaft. The material of
the
shaft
is
steel
50
C4
2
2
The
ut 700 N / mm and yt 460 N / mm .
factors Kb and Kt of the ASME code are 1.5 each.
Determine the shaft diameter using the ASME code.
Nov-Dec 2010
UNIT-1
Q.1
State distortion energy theorem of failure.

Q.2
A non-rotating shaft supporting a load of 2.5 KN as

shown in figure 1.78. The shaft is made of brittle
material with an ultimate tensile strength of
300 N / mm 2 . FOS FOS 3 . Determine the diameter
of shaft.

PAPERS
|6-15
Q.3

as
Q.4
A blower is to run at 10 r.p.s, power to the blower is

available from a motor rated at 8000 watts at 25
r.p.s. Design a chain drive for the system of the
centre distance is to be 800 mm.
Ans. Not in Syllabus
P 50 N 150 N
Q.1
UNIT-2
Q.4
What are the different type of keys?

Q.2
Design a cotter joint to withstand an axial load

varying from 60LKN in tension to 60KN in
compression. Allowable stresses fro the steel used
in the joint are 60 N/mm2 in tension, 75 N/mm2 in
crushing & 48 N/mm2 in shear
(i)
(ii)

Q.3
A knuckle joint is to transmit a force of 140,000 N.

Allowable stresses in tension, shear and
compression are 75 N/mm2, 65 N/mm2, 64 N/mm2
and 140 N/mm2 respectively. Design the joint.
Q.1
A standard splined connection mm is used for the

gear and shaft assembly of a gearbox. The splines
transmit 20 kW power at 300 rpm. The dimensions
of splines are as follows:
Major diameter = 60 mm
Minor diameter = 52 mm (iii) Number of

splines = 8 permissible normal pressure on
splines is 6.5 N/mm2. The coef icient of
friction is 0.06.
Calculate:
(i)
(ii)
Length of hub of the gear
The force required for shifting the gear.
Ans. Refer Q. No. 2.34. In Unit 2.
UNIT-3
What are the types of threads of power screw?

Q.2
An electric motor weighting 10 kN is lifted by

means of an eye bolt. The eyebolt is screwed into
the frame of the motor. The eyebolt has coarse
threads. It is made up of plain carbon steel 30C8
S yt 400 N / mm2 and factor of safety is 6.
Determine the size of bolt..

Q.3
A steel plate subjected to a force of 5 kN and fixed to

a channel by means of three identical bolts as
shown in below figure. The bolts are made from
plain carbon steel 45C8 (Syt = 380 N/mm2)and the
factor of safety is 3. specify the size of bolt.
6-16|MACHINE DESIGN
-I
Q.4
Q.1


(i) Screw
Body
(iv)
UNIT-4
What are the different types of riveted joints?

Q.4
A double riveted double cover butt joint in plates 20

mm thick is made with 25 mm diameter rivets at
100 mm pitch. The permissible stresses are:
st 120 MPa, 100 MPa, c 150 MPa
Find the maximum shear stress induced in the weld

of 6 mm size when a channel as shown in figure is
welded to a plate and loaded with 20 kN force at a
distance 200 mm.
Find the efficiency of joint, taking the strength of the

rivet in the double strength of the rivet in the
double shear as twice than that of the single shear..

Q.3

Q.2
(ii) Nut
The bracket is to carry a load of 45 kN. Determine

size of the rivet, if the shear stress is not to exceed
40 MPa. Assuming all rivets of the same size.

.
UNIT-5
Q.1
What are the methods of design of shaft?

Q.2
A solid shaft is supported on two bearings 1800 mm

apart and rotates at 250 rpm. A 200 involute gear D,
300 mm diameter is keyed to the shaft at a distance
of 150 mm to the left of the right hand bearing. Two
pulleys B and C are located on the shaft at distances
of 600 mm and 1350 mm respectively to the right of

the left hand bearing. The diameters of the pulleys B
and C are 750 mm and 600 mm respectively. 40 H.P.
is supplied to the gear, out of which 25 H.P. taken off
in the pulley C and 15 H.P. from B. The drive from B
is vertically downward while from C the drive is
downward at an angle of 600 to the horizontal. In
both cases tension ratio is 2 and the angle of lap is

PAPERS
|6-17
1800. The combined fatigue and shock factors for
torsion an bending may be taken as 1.5 an 2.0
respectively. Design a suitable shaft taking working
stress to be 42 N/mm2 in shear at 84 N/mm2 in
tension.

Q.3
Permissible crushing stress for bolt and key = 150

N/mm2
Permissible shear stress for cast iron = 8 N/mm2.
Design a C.I. flange coupling to transmit 150 H.P at

250 rpm. The following permissible stresses may be
use
Permissible shear stress for shaft, bolt and key
material = 50 N/mm2 .
Apr-May 2011
UNIT-1
Q.1
Q.3
Explain the following terms

(i)
(ii)
Factor of safety
Stress concentration factor.
(i)
Ans. Refer question 1.3,1.17 in Unit 1.

Q.2
(ii)
A rectangular plate, 15 mm thick, made of a brittle

material is shown in below figure 1.79. Calculate the
stresses at each of three holes of 3, 5 and 10 mm
diameter.
3
Design a roller chain to connect a 10 kW, 1500 rpm

electric motor to a centrifugal pump running at 750
rpm.
Select a proper roller chain
Calculate the pitch circle diameter of driving

(iii) Determine the number of chain lnks.
(iv) Specify the correct centre distance. The

conditions of operation are: Constant load,
fixed centre distance, continuous lubrication,
continuing running.
10
During preliminary stages the centre distance can

be assumed to be 40 times the pitch of the chain
Q.1
Explain the spline with neat sketch.

Q.2
Ans. Not in Syllabus .
UNIT-2
Design a socket and spigot cotter joint to connect

two steel rods of equal diameter. Each rod is
subjected to an axial tensile force of 50 KN. Material
of two rods and cotter is steel 30C8 (S yt = 400 N/m2
and Syc = 2Syt and Ssy = 0.5Syt) The factor of safety for
rods, spigot end and socket end is assumed as 6
while for cotter it is taken as 4.
Ans. Refer Q. No.2.13 &2.4 in Unit 2.

Q.3

6-18|MACHINE DESIGN
-I
UNIT-3
Q.1
Explain the following:

(i)
Tap bolt
(ii)
250
mm
Stud
Solve any one of the following [Either part (b) or

part (c)].

Q.2
(i)
A steel plate subjected to a force of 5 kN and

fixed to a channel by means of three identical
bolts as shown in below figure. The bolts are
made from plain carbon steel 45C8 (Syt = 380
N/mm2)and the factor of safety is 3. specify
the size of bolt.
300
mm
75
mm
5 KN

Q.3
Screw jack general purpose with a load carrying

capacity of 100 kN and maximum lifting height of
350 mm. The screw jack is operated manually by
two workers.
Assume factor safety = 5 Material for :
(i)
(ii)
Q.1
A cast iron bracket, as shown in below figure.

Support a load of 5 kN acting vertically at a
distance of 250 mm from the face of column.
THe bracket is fixed to steel column by means
of four identical bolts, two at A and two at B.
The bolts are made of steel 40 C8 (Syt = 380
N/m2) and factor of safety is 5. Determine the
major diameter of the bolts on the basis of
maximum principal stress.
(ii)
Nut is cast variety of phosphor bronze of

grade 1 (Sut = 190 N/mm2).
Design the following component of screw jack:

(1) Screw (2) Nut
(3) Handle
UNIT-4
Differentiate between permanent and temporary

joint.

Q.2
Screw and handle is plain carbon steel of

grade 30C8 (Syt = 400 N/mm2,mm2, Syt = Syc, E
= 2,07,000 N/mm2).
What is martensite and Austenite and how it is

formed?
50

Q.3
A circular shaft, 50 mm in diameter, is welded to a

support by means of a fillet weld, as shown in below
figure. Determine the size of the weld, if the
permissible shear stress in the weld is limited to
100 N/mm2.

.

PAPERS
|6-19
UNIT-5
Q.1
Explain the difference between rigid and flexible

coupling
Solve any one of the following [Either part (b) or

part(c)].

Q.2

used:
MPa
Shear stress for cast iron = 8 MPa..

Q.3
The layout of an intermediate shaft of a gear box

supporting two spur gears B and C. The shaft is
mounted in two bearings A and D. The pitch circle
diameters of gears B and C are 900 mm and 600 mm
respectively. The material of the shaft is steel
FeE580
ut 770 MPa and yt 460 MPa
K b 1.5 and K t 2.0 . Determine the shaft diameter

using the ASME code. Assume that the gears are
connected to the shaft by means of keys.
Nov-Dec 2011
UNIT-1
Q.1
Explain factor of safety and stress concentration

factor.

Q.2
Drawn S.N. curve for steel and explain:

(i)
(ii)

P 50 N 150 N
Design for infinite life.

Design for finite life..

Q.3

as
6-20|MACHINE DESIGN
-I
Q.4
A compressor is to be actuated from a 10kW electric

motor. The speed of motor shaft is 970 rev/min and
that of the compressor is to be 330. The compressor
operates in two shift. The minimum centre distance
should be 550 mm.
(i)
Q.1

driven sprockets.
(ii)
(iii) Select a proper roller chain.
(iv) Determine the number of chain links.

(v)
UNIT-2
What is the difference between key and splines
Design an draw (sketch) a cotter joint to support a

load varying from 30 kN in compression to 30 kN in
the following allowable stresses may be used. The
load is applied statically.
the key. If the FOS = 3.
Tensile stress = Compressive stresses = 50 MPa;
Q.1
Shear stress = 35 MPa and Crushing stress = 90

MPa.
The standard cross-section for a flat key, which is

fitted on a 50 mm diameter shaft, is 16 10 mm . The
key is transmitting 475 N-m torque from the shaft
to the hub. The key is made of commercial steel
S yt S yc 230 N / mm2 Determine the length of

Q.3

Q.2
Calculate the pitch circle diameter of driving

and driven sprockets.
Q.4
It is required to design a knuckle joint to connect

two circular rods subjected to an axial tensile force
of 50 KN. The rods are co-axial and a small amount
of angular movement between their axes is
permissible. Design the joint and specify the
dimensions of its components. Select a suitable
material for the parts.
UNIT-3
Differentiate between a bolt, tap bolt and stud.
250
mm

Q.2
A double threaded power screw with trapezoidal

thread is used to raise a load of 300 kN. The
nominal diameter is 100 mm and the pitch is 12
mm. The coefficient of friction and screw thread is
0.15. Neglecting collar friction. Calculate:
(i) Torque required to raise the load
(ii) Torque required to lower the load

(iii) Efficiency of the screw.

Q.3
A cast iron bracket, as shown in below figure.

Support a load of 5 kN acting vertically at a distance
of 250 mm from the face of column. The bracket is
fixed to steel column by means of four identical
bolts, two at A and two at B. The bolts are made of
steel 40 C8 (Syt = 380 N/m2) and factor of safety is 5.
Determine the major diameter of the bolts on the
basis of maximum principal stress.
5 KN
300
mm
75
mm

Q.4
A screw jack suitable to lift a maximum load of 50

kN through a height of 200 mm, is to be designed
with the following data:
(i) Allowable stress for screw and handle, Tensile
stress = 90 N/mm2, compressive stress = 110
N/mm2, Shearing stress = 60 N/m2.

PAPERS
|6-21
Allowable bearing pressure between nut and screw
16N/mm2, coefficient of friction of threads and
collar may be taken as 0.14 Design:
Q.1
(i) Screw
UNIT-4

Q.2
Find the efficiency of single reveted lap joint of 6

mm plate with 20 mm diameter rivets having a
pitch of 50 mm. The permissible stresses are:
Tensile, stress in plate = 100 MPa,
Shearing stress in rivets = 80 MPa
Crushing stress in rivets = 160 MPa.

stress 140 MPa and shear stress in the rivet 56 MPa
Q.1
.
UNIT-5
transmit a torque of 800 N-m at 300 rpm. For the
safe stresses mentioned below calculate:
Differentiate between shaft and axle.

Q.2
(i) Diameter of bolts
What is meant by term high carbon steel?

Q.3
A circular shaft, 50 mm in diameter, is welded to a

support by means of a fillet weld, as shown in below
figure. Determine the size of the weld, if the
permissible shear stress in the weld is limited to
100 N/mm2.
50

Q.3
(iii) Handle .
Q.4
List the types of welded joint.
(ii) Nut
Two 35 mm shaft are connected by a flanged

coupling. The flanges are fitted with 6 bolts on 125
mm pitch circle diameter of bolts. The shaft
(iii) Key dimensions
(v) Power transmitted
(ii) Thickness of flanges

(iv) Hub length and
Apr-May 2012
UNIT-1
Q1.
How will you designate the following varieties of

materials:
(i)
(ii)
Grey cast iron with an ultimate tensile

strength of 300 N/mm2.
Plain carbon steel with 0.4% carbon and 0.8
% manganese.
Ans. (i) GCI-25, (ii) C-40 or C-45.

Q.2
State:
(i)
(ii)
Maximum normal stress theory

Maximum shear stress theory.
CSVTU
MANUFACTURING SCIENCE-II CSVTU
TURBO MACHINERY
FLUID MACHINERY
CSVTU
CSVTU
DYNAMICS OF MACHINES CSVTU
MACHINE DESIGN-1
OPERATIONS RESEARCH CSVTU
5
5
5
6-22|MACHINE
DESIGN- I
Q.3
A long straight tube, 76 mm internal diameter and

2.5 mm thick is subjected to an internal pressure of
5.6 N/mm2. Consider it as a thin cylinder. IF the
tube is subjected to a twisting moment of 70 Nm,
Elastic limit stress = 282 N/mm2, determine the
factors of safety on
(i)
(ii)
Q1.
(iii) Distortion energy theory

its dimensions
Determine the pitch circle diameters of

driving and driven sprockets
(iii) Determine the number of chain links
(iv) Specify the correct centre distance between

the axes of sprockets.
Design a chain drive to transmit 10 kW from an

electric motor running at 1440 rpm to a centrifugal
UNIT-2
Q.3
Write the function of key and name them.
Briefly write different types and applications of a

cotter joint. Differentiate between a cotter and a
key.
Q1.
(ii)
Maximum shear stress theory

Q.2
(i)
Maximum principal stress theory

Q.4
pump running at 720 rpm. The service condition

involve moderate shocks.
Design a cotter joint for carrying an axial load of 10

kN..

Q.4
Design a knuckle joint to connect two tension rods

subjected to an axial load of 15 kN.
UNIT-3
What is a power screw and state its applications.

Q.2
Write any four forms of threads and briefly explain.

Q.3
The lead screw of a lathe has trapezoidal threads.

To drive the tool carriage the screw has to exert an
axial force of 20 kN. The thrust is carried by the
collar. The length of the lead screw is 1.5 m.
Coefficient of friction at the collar and nut are 0.1
and 0.15 respectively. Suggest suitable size of screw
and height, of the nut if the permissible bearing
pressure is 4 MPa. Check for maximum shear stress
Ans. Refer Q. No 4.50 in Unit 4.

Q.4
Q.1
A bracket is itted to a vertical channel with 5 bolts,

three at the top and two at the bottom with all the
botls equally spaced. The value of P = 20 kN, e = 200
mm. l1 = 50 mm and l2 = 250 mm.
What are the various modes in which a riveted joint

may fail?
l2
l1
UNIT-4
Q.2
A triple riveted lap joint is to be made between 6.5

mm
plates.
The
allowable
stress
f t 35 N / mm 2 , f s 29 N / mm 2 , f c 52.50 N / mm 2

PAPERS
|6-23
Calculate the rivet diameter, rivet pitch and back
pitch, zig-zag riveting is to be used. Indicate how the
joint will fail..

Q.3
Q.1
Determine the size, of the weld required for static

loading in the eccentrically loaded weld as shown in
below figure The effective length of the weld is
12.5 mm shorter than the weld to allow for starting
and stopping of the weld
UNIT-5
up of grey cast-iron FG200 Sut 200 N / mm 2 FOS
Why is it essential to use coupling? What are their

different types?.
for shaft and key is 4. For sleeve, the FOS = 6 based

on ultimate strength.

Q.2
Differentiate between shaft and axle. What are the

causes of failure of shaft?

Q.3
Design a muff coupling which is used to connect two

steel shafts transmitting 25 KW power at 360 rpm.
The shaft and key are made of plain carbon steel
30C8 S yt S yc 400 N / mm 2 The sleeve is made
Nov-Dec 2012
UNIT-1
Q1.
Define stress concentration factor?.

Q.2
A flat plate subjected to a tensile force of 5 KN is

shown. The plate material is grey cast iron FG 200
and FOS 2.5 . Determine the thickness of the
plate.
rpm, center distance 550 mm, chain is adjustable,

working condition 8 hr per day. Design a chain in
terms of:
(i)
(ii)
Specify the number of teeth of the driving &

driven sprockets
Determine the number chain links
(iii) Specify the correct center distance between

axis.
(iv) Select a proper roller chain
(v)
Calculate the pitch circle diameter of driving &

driven sprockets.

Q.3
It is required to design a chain drive with power 15

HP, motor speed 97 r.p.m, compressor speed 350
6-24|MACHINE DESIGN
-I
UNIT-2
Q1. What is the difference between key & splines?.
Q.2
Q1.
Design a cotter joint to support a load varying 30 kN

in compression to 30 kN in tension. The material
used is carbon steel for which the following
allowable stress may be used. The load is applied
statically. Tensile stress =Compressive stress = 50
MPa, shear stress = 35 MPa and crushing stress = 90
MPa

Q.3

MPa in shear and 150 MPa in compression
UNIT-3
What are the types of threads for power screws?

Q.2
The lead screw of a lathe has has Acme threads of

50 mm outside diameter and 8 mm pitch the screw
must exert an axial pressure of 2500 N in order to
drive the total carrieage. The thrust is carried on a
collar 110 mm outside diameter and 55mm inside
diameter and the lead screw rotate at 30 rpm.
Determine (a) The power required to drive the
screw and (b) The efficiency of the lead screw.
Assume a coefficient of friction of 0.15 for the screw
and 0.12 for collar.

Q.3

as shown. THe bolts are made of plain carbon steel
Q.1
UNIT-4
Define the efficiency of riveted joint.

Q.2
A double riveted lap joint with zigzag riveting is to

be designed for 13 mm thick plates assume
t 80 MPa, 60 MPa, c 120 MPa State how
the joint will fail and find the efficiency of the joint.

Q.3

permissible shear stress is limited to 95 N/mm 2.
.

PAPERS
|6-25
UNIT-5
Q.1
be taken as 40 MPa and 80 MPa respectively. The

material for the muff is cast iron for which the
allowable shear stress may be assumed as 15 MPa.
Differentiate between shaft & axle.

Q.2
Design a shaft to transmit power from an electric

motor to a lathe head stock through a pulley by
means of a belt drive. The pulley weighs 200N and
is located at 300 mm from the center of bearing. The
diameter of the pulley is 200 mm and the maximum
power transmitted is 1 kW at 120 rpm. The angle of
lap of the belt is 1800coefficent of friction between
the belt 7 the pulley is 0.3. The shock and fatigue
factors for bearing twisting are 0.5 and 2.0
respectively. The allowable shear stress in the shaft
may be taken as 35 MPa

Q.3

steel shafts transmitting 40 KW at 350 r.p.m. The
material for the shaft and key is plain carbon steel
for which allowable shear and crushing stress may
Apr-May 2013
UNIT-1
Q.1
Define:
(i) Stress concentration
P 50 N 150 N
(ii) Notch sensitivity .

Q.2

as

diameter "d" of the beam at the fillet crosssection.
Q.3
Design a roller chain drive to connect a 15 kW, 1500

750 rpm. The conditions of operation are constant
load, fixed center distance, continuous lubrication,
continuous running.
UNIT-2
Q.1
List the various function of keys.
Q.2
Design a joint to connect two rods of equal diameter

to resist a tensile load of 60 kN. All parts of the joint
are made of same material.
6-26|MACHINE DESIGN
-I
statically. Tensile stress =Compressive stress = 50
MPa, shear stress = 35 MPa and crushing stress = 90
MPa.
Allowable stresses
t 60 MPa, 70 MPa, c 125 MPa .

Q.3
Q.1
Design a cotter joint to support a load varying 30 kN

in compression to 30 kN in tension. The material
used is carbon steel for which the following
allowable stress may be used. The load is applied
What is the difference between a rivet and a bolt.

Q.2

theory.
UNIT-3
Q.3
A power screw having double start square thread of

25 mm nominal diameter and 5 mm pitch is acted
upon by an axial load of 10 kN. The outer and inner
diameters of screw collar are 50 mm and 20 mm.
The coefficient of thread friction and collar friction
may be 0.2 and 0.15. The screw rotates at 12 rpm,
allowable thread bearing pressure is 5.8 MPa. Find:
(i) Torque required
(ii) Stress in screw
Design the screw for ASME code
(iii)
UNIT-4
Q.1
What is a throat and legt in case of weld? Weld?

What is the relation between them?

Q.2
A rectangular steel plate is welded as a cantilever to

a vertical column and supports single concentrated
load P as shown in figure. Determine the weld size if
shear stress in the same is not to exceed 140 MPa.

Q.3


Q.4
Sketch and explain TTT curve for a specific

composition of steel.

.

PAPERS
|6-27
UNIT-5
Q.1
What is strength, rigidity & stiffnes in design of

shaft.

Q.2

the
shaft
is
steel
50
C4
The
ut 700 N / mm2 and yt 460 N / mm2 .

Q.3

steel shafts transmitting 25 KW power at 360 rpm.
The shaft and key are made of plain carbon steel
30C8 S yt S yc 400 N / mm 2 The sleeve is made
up of grey cast-iron FG200 Sut 200 N / mm 2 FOS

for shaft and key is 4. For sleeve, the FOS = 6 based
on ultimate strength
Nov-Dec 2013
UNIT-1
Q.1
State
(i)
(ii)
Maximum normal stress theory
P 50 N 150 N
Stress concentration factor

Q.2

as

Q.3
A rectangular plate, 15 mm thick, made of a brittle

material is shown in below figure 1.79. Calculate the
stresses at each of three holes of 3, 5 and 10 mm
diameter.
6-28|MACHINE DESIGN
-I
Q.4
3
10
A
rotating
bar
made
of
steel
45C 8 Sut 630 N / mm 2 is subjected to a
completely reversed bending stress. The

corrected endurance limit of the bar is
315 N / mm 2 . Calculate the figure strength of
the bar for a life of 90000 cycles
Ans. Refer question 1.36 & 39 in Unit 1.
(i)

its dimensions.
(iii)
Determine the number of chain links
(ii)
Or
(ii)
Design a roller chain drive to connect a 15 kW 1500

750 rpm. THe service conditions involve moderate
shocks.
Determine the pitch circle diameter of driving
(iv) Recommend the correct centre distance

between the axes of the sprockets
The conditions of operations are: Constant load,
Fixed centre distance, Continuous lubrication,
Continuous running.
UNIT-2
Q.1
What are the different types of key? Enumerate the

functions of keys
Q.3

Q.2

section to sustain maximum pull of 70 KN. THe
ultimate tensile strength and shearing strength of
the pin material are 510 MPa and 396 MPa
respectively. Determine the tie rod section and the
pin section. Take FOS=6. ut (for rod) = 420 MPa..
Ans. Refer similar Q. No. 2.16 in Unit 2.
Q.1
(i)
(ii)
What are the types of threads of power

screw?
What is initial tension in a bolt, what is force
deformation diagram for bolted, joint?

(i)
Screw
(ii)
UNIT-3

Q.2

while for cotter it is taken as 4...
(iv) Body.

Q.3

as shown. The bolts are made of plain carbon steel
Nut (iii) Handle and cup

PAPERS
|6-29
Q.4
A bolted joint is used to connect two components.

The combined stiffness of the two components is
twice the stiffness of bolt. The initial tightening of
nut results in a pre-load of 5 kN in the bolt. The
external force of 10 kN creates further tension in
bolt. The bolt is made of plain carbon steel 30C8
with yield point stress in tension = 400 N/mm2 and
factor of safety is 3. There are coarse threads on the
bolt. Determine the size of bolt
UNIT-4
Q.1
Find the efficiency of single reveted lap joint of 6

mm plate with 20 mm diameter rivets having a
pitch of 50 mm. The permissible stresses are:
Tensile, stress in plate = 100 MPa,
Shearing stress in rivets = 80 MPa
Crushing stress in rivets = 160 MPa
Ans. Refer question 5.13 in Unit 5

Q.2


Q.4

Q.3
Q.1

permissible shear stress is limited to 95 N/mm2.
UNIT-5
Differentiate between a shaft and an axle. What are

the causes of failure of shaft?
Design a rigid muff coupling. Use CI. material for the

muff. The power transmitted is 25 kW at 300 rpm.
Ultimate tensile strength = 200 MPa and factor of
safety = 6. Use 30C8 steel for the shaft considered.
Yield point stress = 330 MPa and factor of safety = 4.
Ans. Refer similar Q. No.2.29 in Unit 2.

Q.3


= 125 MPa.

used:

MPa

Q.2

Shear stress for cast iron = 8 MPa.

Q.4
A machined surface shaft carries a completely

reversed bending moment of 3 kN-m and a torque
of 10.8 kN-m. The stress concentration factor for
bending and torsion is 1.35. Take factor of safety =
2.0.
The
ultimate
strength
of
material
2
u 825 N / mm 2 ; yield strength yt 610 N / mm .
6-30|MACHINE DESIGN
-I
Calculate the diameter of shaft based on maximum
shear stress theory of failure. Neglect notch
sensitivity.
Apr-May 2014
UNIT-1
Q.1. Explain the following terms:
(i)
Design stress
(ii)

Q.2
Factor of safety
P 50 N 150 N
A transmission shaft made of steel 20C8 (Sut = 440

N/mm2) is subjected to reversed torsional moment.
The shaft diameter is 30 mm and the expected
reliability is 95%. There is a step in the shaft, at
which the theoretical stress concentration factor is
1.8 while the notch sensitivity factor is 0.86

Q.4
Determine the endurance limit for reversed

torsional moment, using the distortion energy
theory.

Q.3
(i)

as
It is required to design a chain drive with a douplex

chain to connect a 15 kW, 1400 rpm electric motor
to a transmission shaft running at 350 rpm. The
operation involves moderate shocks.
(ii)

driven sprockets.
Select a proper roller chain.
(iii) Calculate the pitch circle diameters of the

driving and driven sprockets.
(iv) Determine the number of chain links.
(v)
During preliminary stages, the centre distance can

be assumed to be 40 times the pitch of the chain.
UNIT-2
Q.1
Prove that a square key is equally strong in shear

and compression.

Q.2

section to sustain maximum pull of 70 KN. The
ultimate tensile strength and shearing strength of
the pin material are 510 MPa and 396 MPa
respectively. Determine the tie rod section and the
pin section. Take FOS=6. ut (for rod) = 420 MPa.

Q.3
Design a joint to connect two rods of equal diameter

to resist a tensile load of 60 kN. All parts of the joint
are made of same material.
Allowable stresses
t 60 MPa, 70 MPa, c 125 MPa .

PAPERS
|6-31
UNIT-3
distance between bolts 1 and 3 is 150 mm. All the
bolts are identical. The bolts are made from plain
carbon steel 30C8 (Syt = 400 N/mm2) and factor of
safety is 2.5. Determine the size of the bolts
Q.1. Explain collar friction.

Q.2
A sluice valve used in water-pipelines, consist of a

gate raised by the spindle, which is rotated by the
hand wheel. The spindle has single-start square
threads. The nominal diameter is 36 mm, and the
pitch is 6 mm. The inner and outer diameters of the
friction collar are 30 mm and 50 mm respectively.
The coefficients of friction at the threads and the
collar are CI. 15 and 0.20 respectively. The weight of
the gate is 7.5 kN, and the frictional resistance to
open the valve due to water pressure is 2.5 kN.
Using the uniform wear theory for collar friction,
calculate:
(i)
(ii)
The torque required to raise the gate and

The overall efficiency of the mechanism

Q.3
The structural connection shown in figure is

subjected to an eccentric force P of 10 kN with an
eccentricity of 500 mm. The centre distance
between bolts 1 and 2 is 200 mm, and the centre
Ans. Refer similar Q. No. 4.12 in Unit 4
UNIT-4
Q.1. Define the efficiency of riveted joint.

Q.2


Q.3

50 mm
UNIT-5
Q.1
Define angle of twist.
Q.2
A transmission shaft, supporting two pulleys A and

B an mounted between two bearings C1& C2 as
shown in figure. Power is transmitted from pulley A
6-32|MACHINE DESIGN
-I
to B, the shaft is made of plain carbon steel 45 C8
yt 380 N / mm2 )
( sut 600 N / mm 2 and
The
pulleys are keyed to the shaft. Determine the shaft
diameter using the ASME code, if K b 1.5& K t 1.0
.
300
200
Nov-Dec 2014
UNIT-1
Q.1
Define factor of safety. Give a guidelines for

selection of factor of safety.
subjected to a completely reversed axial force of

50 KN . The expected reliability is 90% and
FOS 2 . The size factor is 0.85 . Determine the
plate thickness "t" for infinite life, if notch
sensitivity factor is 0.8.

Q.2
A plate, 10 mm thick subjected to a tensile load of

20 kN shown in figure. The plate is made of cast iron
ut 350 N / mm2 and the factor of safety is 2.5.
Determine the fillet Radius
5r
P 50 kN
P 50 kN

Q.4

Q.3
A component machined from a plate made of steel

45C 8 Sut 630 N / mm 2 is shown in figure. It is
A cantilever beam of cold drawn steel 20C8

Sut 540 N / mm 2 is subjected to a completely
reversed load of 10000N. The notch sensitivity

factor q 0.85 and expected reliability is 90%.
Determine the diameter d for the beam for a life of
1000 cycles..

PAPERS
|6-33
P 1000 N
Q.1
UNIT-2
What are the different types of keys?

Q.3

Q.2
Design and draw a socket and spigot cotter joint.

Support a load varying from 10 kN in tension to
compression. The material used is steel permissible
stresses are:
Tensile
stress
Q.1
coupling.
t 50 N / mm 2 , 35 N / mm 2 ,
c is 90 N / mm 2
Ans. Refer Q. No.2.43, 2.36 in Unit 2.
UNIT-3
Define shaft. What is the difference between shaft

and axle
450

Q.2
A rigid coupling is used to transmit 20 kW power at

720 rpm. There are four bolts and the pitch circle
dia of bolt is 125 mm. The bolts are made of
C 45 ut 380 N / mm 2 and F.O.S is 3. Design the
A line shaft supporting two pulleys A and B. Power

is supplied to the shaft by means of a vertical belt on
the pulley A, which is then transmitted to the pulley
B carrying a horizontal belt. The ratio of belt tension
on tight and loose sides is 3:1. The limiting value of
tension in the belts is 2.7 KN. The shaft is made of
plain carbon steel 40C8, Sut = 650 N/mm2 and Syt =
380 N/mm2. The pulleys are keyed to the shaft.
Determine the diameter of the shaft according to
the ASME code, if
250
K b 1.5& K t 1.0
450
P1
250
P3
P2
450
P4
UNIT-4
Q.1
What are the different types of power threads.

Q.2
A cast iron bracket fixed to the steel structure is

shown in figure (a). It supports a load P of 25 kN.
There are two bolts at A and two bolts at B. The

distances are as follows.
l1 50 mm, l2 200 mm, l 400 mm
Determine the rise of the bolts, if maximum

permissible tensile stress in the bolt is 50 N/mm2
6-34|MACHINE DESIGN
-I
l1
l2
(i)

Q.3
Q.1
(iv)
Screw
Body.
(ii)
Nut (iii) Handle and cup
Ans. Refer similar question 4.45 in Unit 4.

UNIT-5
What is the strength of a riveted joint.

Q.2

= 125 MPa..

Q.3
The bracket is to carry a load of 45 kN. Determine

size of the rivet, if the shear stress is not to exceed
40 MPa. Assuming all rivets of the same size.
DEC 2014, 10

Q.4
A bracket carrying a load of 15 kN is to be welded as

shown in figure. Find the size of the weld required if
the allowable shear stress is not to exceed 80 MPa.
6-36|MACHINE DESIGN
-I
UNIT-3
Q.1
Define centrifugal clutch.
Ans. Refer Q. No.3.37 Unit 3.

Q.2
125
A single dry plate clutch is to be designed to

transmit 7.5 kW at 900 rpm. Find :
(i)
(ii)
Diameter of shaft.
Mean radius and face width of the friction

lining assuming , the ratio of mean radius to
face width as 4.
17.10
(iii) Outer and inner radii of the clutch plate.
(iv) Dimensions of spring, assuming that the

number of springs are 6 and spring index 6.
The allowable shear for the spring wire will
may be taken as 420 MPa.

Q.3
547 N
1820 N
16.60
990 N
3535 N
400
The layout of a two stage 20 kW V belt speed

reduction is shown below. The first stage consists of
a 120 mm diameter engine-driven input pulley
rotating at 2400 rpm and driving a 400 mm
diameter pulley mounted on an intermediate shaft.
The 200 mm diameter small pulley of the second
stage is also mounted on this intermediate shaft and
drives 360 mm diameter out pulley connected to
the load. Tensions are indicated on the sketch.
Design the intermediate shaft abcd. Design stress be
taken as 25 MPa.
Intermediate shaft preliminary layout
Ans. V belt is out of syllabus.
UNIT-4
Q.1
What do you understand by sing start and double

start threads?
L1

Q.2
A pillar crane having a circular base of 600 mm

diameter is fixed to the foundation of concrete base
by means of four bolts. The bolts are of size 30 mm
and are equally spaced on a bolt circle diameter of
500 mm. Determine : The distance of the load from
the centre of the pillar along a line XX as shown in
figure. The load lifted by the pillar crane is 60 kN
and allowable tensile stress for bolt material is 60
MPa.
L2
Ans. Referquestion 4.15 in Unit 4.
630

PAPERS
|6-37
Q.3
diameters of screw collar are 50 mm and 20 mm.

The coefficient of thread friction and collar friction
may be 0.2 and 0.15. The screw rotates at 12 rpm,
allowable thread bearing pressure is 5.8 MPa. Find:
Write short notes on the following

(i)
(ii)
Power threads
Efficiency of thread
(iii) Self-locking of threads
(i)
Ans. Refer question 4.20 and 4.24 in Unit 4.

Q.4
Q.1
A power screw having double start square thread of

25 mm nominal diameter and 5 mm pitch is acted
upon by an axial load of 10 kN. The outer and inner
What are the different types of welded joints?

Q.2

plates for the longitudinal seam of a boiler shell of
0.75 m diameter. To carry a maximum steam
pressure of 1.05 kN/mm2. The allowable stresses in
tension crushing and shear are 35 N/mm2, 52.5
N/mm2 and 28 N/ mm2. The efficiency of it is
between 70% to 75%.
(ii)
Torque required
Stress in screw
(iii) Design the screw for ASME code
UNIT-5
Q.3
Derive an expression for a welded joint subjected to

an eccentric loading, load is perpendicular to plane
of weld.

Q.4
A double riveted lap joint is to be made between 9.5

m plates. IF the safe working stresses are
c 1.5 t ,
r 80 N / mm 2 , s 60 N / mm 2 and
calculate the rivet pitch, the distance between rows
of rivets for the joint. State how the joint will fail.
Nov-Dec 2015
UNIT-1
Q.1
Define stress concentration and state how its effect

is considered.

Q.2

Q.3
A rotating shaft, subjected to a non-rotating force of

5 kN and simply supported between two bearings A
and E is shown in figure. The shaft is machined
from plain carbon steel 30C8(Sut = 500 N/mm2) and
the expected reliability is 90%. When is the life of
the shaft if notch sensitivity factor is 0.78?
A polished steel bar is subjected to axial tensile

force that varies from zero to Pmax It has groove 2
mm deep and having a radius of 3 mm. The
theoretical stress concentration factor and notch
sensitivity factor at the groove are 1.8 and 0.95
respectively. The outer diameter of the bar is 30
mm. The ultimate tensile strength of the bar is 1250
MPa. The endurance limit in reversed bending is
600 MPa. Find the maximum force that the bar can
carry for 105 cycles with 90% reliability.

30
45
30
6-38|MACHINE DESIGN
-I
UNIT-2
Q.1
Differentiate between saddle key and sunk key.
Q.3

Q.2

while for cotter it is taken as 4.
Design a rigid flange coupling transmitting 37.5 kW

power at 180 r.p.m. THe material for shafts and
keys is C 40 while that of flange is FG 200. Assume
Syc = 1.5 Syt and.
UNIT-3
Q.1
A single-clutch consists of one pair of contacting

surfaces. Because of space limitations, the outer
diameter of friction disk is fixed as D. The
permissible intensity of pressure is P and coefficient
of friction is . Assuming uniform wear theory,
show that the torque transmiting capacity of the
clutch is maximum when (d/D) is equal to 0.577.
Ans. Refer similar Q. No.3.27 in Unit 3.

Q.2

the
shaft
is
steel
50
C4
2
2
The
ut 700 N / mm and yt 460 N / mm .

Q.3
A transmission shaft supporting a helical gear B and

an over hauling bevel gear D as shown in figure
The shaft is mounted on two bearing A and C. THe
pitch circle diameter of the helical gear is 450 mm
and the diameter of the bevel gear at the forces is
450 mm. Power is transmitted from the helical gear
to the bevel gear. The gears are keyed to the shaft.
The material of the shaft is steel 45 C8
ut 600 N / mm 2 & yt 380 N / mm 2 .
K b 2.0 and K t 1.5 Determine the shaft diameter

using the ASME code.


PAPERS
|6-39
UNIT-4
Q.1
Part (a) is compulsory and attempt any two from

parts (b) , (c) and (d)
(a) What are the basic types of threads used in
power screws?
nominal diameter of the bolts on the basis of

maximum principal stress Assume (dc= 0.8d):

Q.2
A steel plate subjected to a force of 5 kN and fixed to

a channel by means of three identical bolts is shown
in figure . The bolts are made of plain carbon steel
30C8 (Syt = 400 N/mm2) and the factor of safety is 3.
Determine the diameter of the shank

Q.4

Q.3
A bracket for supporting the travelling crane is

shown in figure. The bracket is fixed by means of
four identical bolts, two at A and two at B. A load of
5 kN is acting downwards at a distance of 250 mm
from column. The bolts are made of steel 40C8 (S yt =
380 N/mm2) and factor of safety is 5. Determine the
A screw has single start square threads of 80 mm

nominal diameter and 10 mm pitch. The screw is
exerting a maximum axial force of 10 kN. The mean
radius of friction coilar is 30 mm. The axial length of
the nut is 40 mm. The coefficient of friction at the
threads and the collar is 0.12. The mean diameter of
the rim of the handwheel is 500 mm. Calculate.
(i)
(ii)
Force exerted at the rim to drive the screw

The efficiency of the device,
(iii) The bearing pressure on the threads in the

nut.
UNIT-5
Q.1
What are the different types of joints used in riveted

joints?.

Q.2
A boiler with 1.5 m inside diameter is subjected to

internal pressure of 1.5 MPa. It is made of steel by
triple rived double strap longitudinal butt joint with
equal straps. The pitch of rivets in outer row is
twice the inner row and patter is zig-zag. The
efficiency should be at least 80%. The permissible
stresses in tension, shear and compression are 80
N/mm2, 60 N/mm2 and 120 N/mm2 respectively.
Assume that rivets in double shear is 1.875 times
stronger than in single shear. Design the joint with
neat sketch.

Q.3
An eccentrically loaded bracket is welded to the

support as shown in figure The permissible shear
stress for the weld material is 55 N/mm2 and the

load is static. Determine the throat and leg
dimensions for the welds.
100
100
25 kN
150

1472636232

Uploaded by

Copyright:

Available Formats

1472636232

Uploaded by

Document Information

Original Description:

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

1472636232

Uploaded by

Copyright:

Available Formats

6

CSVTU PREVIOUS YEARS QUESTION PAPERS

CSVTU PREVIOUS YEARS QUESTION

Explain the following terms:

(i) Design stress (ii) Factor of safety

Ans. Refer Q. No.1.3 in Unit 1.

A steel shaft is subjected to a constant

Ans. Refer Q. No.1.30 in Unit 1.

Design a roller chain drive to connect a 15 kW 1500

What steady load P can be applied on a

Taking notch sensitivity into action, find the value of

If the value of in fluctuates between 2 F and 4 F, find

Select a proper roller chain and give a list of

Determine the pitch circle diameters of

(iii) Determine the number of chain links

(iv) Recommend the correct centre distance

Ans. Not in Syllabus.

Prove that a square key is equally strong in shear

Ans. Refer Q. No.2.19 in Unit 2.

Design a knuckle joint (with fork and eye) to

Ans. Refer Q. No.2.18 in Unit 2.

Design a cotter joint to carry a maximum load of

Ans. Refer Q. No. 2.12 in Unit 2..

between bolts 1 and 2 is 200 mm, and the centre

Differentiate between a bolt and tap bolt.

Ans. A bolt is a threaded fastener mated with a nut. One

A tap bolt is a bolt with a head on one end and a

Ans. Refer Q. No. 4.12 in Unit 4.

(iii) Handle and cup (iv) Body

Ans. Refer Q. No. 4.45 in Unit 4.

The structural connection shown in figure is

A bolted joint is used to connect two components.

Ans. Refer Q. No. 4.17 in Unit 4

Define the efficiency of riveted joint.

Ans. Refer Q. No. 5.4 in Unit 5.

A rectangular cross-section bar is welded to a

Ans. Refer Q. No. 5.27 in Unit 5.

Design a double riveted butt joint with two cover

Ans. Refer Q. No. 5.14 in Unit 5.

MECHANICAL eryc GATEMENTOR

CSVTU PREVIOUS YEARS QUESTION

Explain the difference between design of shaft

Ans. Refer Q. No. 3.16 in Unit 3.

Ans. Refer Q. No. 3.2 in Unit 3.

A machined surface shaft carries a completely

Design a clamp muff coupling to transmit 30 kW at

Ans. Refer Q. No. 2.29 in Unit 2.

A plate made of steel 20 C8 ut 440 N / mm 2 in

hot-rolled and normalized condition is shown in

Specify the correct centre distance.

Ans. Not in syllabus.

Design a knuckle joint for a tie rod of a circular

Ans. Refer Q. No.2.16 in Unit 2.

Select a proper roller chain

(iv) Determine the number of chain links

Ans. Refer Q. No.1.31 in Unit 1.

Specify the number of teeth on the driving and

(iii) Calculate the pitch circle diameters of driving

It is required to design a chain drive with a duplex