An ammonia compressor is driven by a 20kW SAE 1020.

How deep should the bolt be

motor. The compressor and the motor RPM drilled?
are 380 and 1750, respectively. The small
sheave has a pitch diameter of 152.4 mm. A. 38.1 mm
If the bolt to be used is standard C-120 B. 40.2 mm
(L=122.9in.). Determine the center C. 37.3 mm
distance between sheaves D. 35.5 mm

A. 709 mm Ans. A
B. 865 mm
A single square thread power screw is to
C. 806 mm
raise a load of 70 kN. The screw has a
D. 686 mm
major diameter of 36 mm and a pitch of 6
Ans. C mm. The coefficient of thread friction
and collar friction are 0.13 and 0.10
A safety valve spring having 9 and respectively. If the collar mean diameter
coils has the ends squared and ground. is 90 mm and the screw turns at 60rpm,
The outside diameter of the coil is 115 find the combined efficiency of screw and
mm and the wire is 13 mm. It has a free collar.
length of 203 mm. Determine the length of
the wire to which this spring must be A. 13.438%
initially compressed to hold a boiler B. 15.530%
pressure of 1.38 MPa on the seat of 32 mm C. 14.526%
diameter. Modulus of rigidity is taken as D. 12.526%
G=80GN/m.
Ans. D
A. 172
Find the horsepower required to drive a
B. 179
power screw lifting a load of 4000 lbs. A
C. 192
2 and inches double square thread with
D. 158
two threads/in is to be used. The
Ans. A friction radius of the collar is 2 inches
and the coefficients of friction are 0.1
A single threaded trapezoidal metric for the threads and 0.15 for the collar.
thread has a pitch of 4 mm, and a mean The velocity of the nut is 10 ft/min.
diameter of 18 mm. It is used as a
translation screw in conjunction with a A. 5.382 HP
collar having an outside diameter of 37 B. 4.395 HP
mm and an inside diameter of 27 mm. Find C. 3.683 HP
the required torque in N-m to raise a D. 6.472 HP
load of 400 kg if the coefficient of
Ans. B
friction is 0.3 for both thread and
collar. A flywheel has a mean diameter of 4 ft
and is required to handle 2200 ft-lb of
A. 34.6 N-m
kinetic energy. The flywheel has a width
B. 32.6 N-m
of 8in. Normal operating speed is 300 rpm
C. 39.1 N-m
and the coefficient of fluctuation is to
D. 38.5 N-m
be 0.05. Find the weight of the rim
Ans. B assuming that the arms and hub are
equivalent is 10% of the specific weight.
Determine the diameter of the stud bolt
that are required to fasten down the A. 412 lb
cylinder head of a 203 mm x 304 mm gas B. 334 lb
engine. There are ten bolts on the block. C. 452.4 lb
The explosion pressure is 31 kg/sq.cm and D. 533 lb
studs are made of ordinary bolts material
Ans. B B. Impact
C. Creep
Find the rim thickness for a cast iron D. Load
flywheel with a width of 200 mm, a mean
diameter of 1.2 in a normal operating Ans. A
speed of 300 rpm, a coefficient
fluctuation of 0.05 and which is capable A cone-disk spring is also known as _____
of hanging 3000 N-m of kinetic energy.
A. Believille Spring
Assume that the hub and arms represent
B. Heavy duty spring
10% of the rim weight and the specific
C. Helical spring
weight of cast iron is 7200 kg/m
D. Conical spring
A. 25.28 mm
Ans. A
B. 28.82 mm
C. 28.25 mm What is the other term used for die
D. 25.25 mm casting?
Ans. C A. Thermosetting
B. Shell-molding
A cast iron flywheel is rotated at a
C. Metal-mold casting
speed of 1200 rpm and having a mean rim
D. Tangential casting
radius of 1 foot. If the weight of the
rim is 30 lbs. What is the centrifugal Ans. C
force? Use factor C=41.
It is a cold-working process in which
A. 14,800 lbs metal is gathered or upset.
B. 70,000 lbs
C. 14 800 lbs A. Heading
D. 14,700 lbs B. Cold rolling
C. Spinning
Ans. D D. Stamping
The maximum-strain theory which apples Ans. A
only in elastic range of stresses are
also known as _______ Which of the following is the high-leaded
brass used for instrument, lock and watch
parts?
A. Hookes Law
B. Saint Venants Theory A. Red brass
C. Stress-strain Theory B. Commercial brass
D. Catalignos Theory C. Yellow brass
D. Engravers brass
Ans. B
Ans. D
It refers to the collision of two or more
masses with initial velocities. The rapid cooling of steel to a
temperature between 400 to 800 deg F in
A. Shock enough time, then austenite is
B. Impact transformed into a materials called.
C. Creep
D. Load A. Bainite
B. Lignite
Ans. B C. Quinite
D. Ferrite
A term used to describe sudden applied
force or disturbance. Ans. A
A. Shock
A centrifugal pump is directly couple to Ans. D
a motor. The pump rating is 3,600 liters
per minute against a total head of 8 What load P which causea total
meters of water. Pump efficiency is 65% deformation of 0.036 inch of a steel rack
at shaft speed of 550 rpm. Calculate the which has a cross-section area of 4 sq.
torsional stress induced on the 40 mm inches and a length of 5 ft.
diameter motor shaft.
A. 55,000 lb
A. 11,193.45 kPa B. 72,000 lb
B. 12,420.72 kPa C. 60,000 lb
C. 10,010.85 kPa D. 50,000 lb
D. 13,113.83 kPa
Ans. B
Ans. C
A lubrication where lubricant is
A 80 mm solid shaft is to be replaced introduced between surfaces which are in
with a hallow shaft of equal torsional rolling contact such as roller gears or
strength. Find percentage of weight rolling bearings?
saved, if the outside of the hallow shaft
A. Hydrostatic lubrication
is 100 mm.
B. Hydrodynamic lubrication
A. 56.53% C. Elastohydrodynamic lubrication
B. 67.31% D. Solid-film lubrication
C. 48.49%
Ans. C
D. 52.90%
What lubrication is usually used when
Ans. D
bearings are operating at extreme
A solid transmission shaft is 4.0 inches temperatures?
in diameter. It is desired to replace it
A. Hydrodynamic lubrication
with a hallow shaft of the same material
B. Solid-film lubrication
and same torsional strength but its
C. Hydrostatic lubrication
weight should only be half as much as the
D. Liquid-film lubrication
solid shaft. Find the outside diameter of
the hallow shaft in millimeters. Ans. B
A. 107.315 mm Which of the following is not a form of
B. 112.231 mm bearing lubrication?
C. 122.940 mm
D. 131.204 mm A. Liquid-film lubrication
B. Hydrodynamic lubrication
Ans. C C. Hydrostatic lubrication
D. Solid-film lubrication
A railroad track is laid at a temperature
of 10 degree F with gaps of 0.01 feet Ans. A
between the ends of the rails. The rails
are 33 feet long. If they are prevented In ASTM standard, what is the instrument
from buckling, what stress will result used in determining viscosity?
from a temperature of 110 degree F?
Coefficient of linear expansion = 6.5x A. Dynamic viscometer
per degree F. B. Saybolt universal furol
C. Hagen-Poinsulle viscometer
A. 10,000 psi D. Saybolt universe viscometer
B. 8,530 psi
C. 9,450 psi Ans. D
D. 10409 psi
In what country that the present theory A. Train value
of hydrodynamic lubrication originates B. Modular value
from? C. Ratio factor
D. None of these
A. China
B. Germany Ans. A
C. US
D. England For very slender column, what type of
formula that is best applied?
Ans. D
A. Column formula
In viscosity chart, Raimond-Boyd analysis B. Moment formulas
assumed that the viscosity of the C. Slenderness formulas
lubricant is _________ D. Euler formula

A. Constant Ans. A
B. Increasing
C. Decreasing Which of the following is the type of
D. Vanishing failure due to unstability?

Ans. A A. Buckling
B. Stability
What do you call the phenomenon occurring C. Slenderness formulas
when two touching surfaces have a high D. Euler formula
contact pressure and when these surfaces
have minute relative motion? Ans. A

A. Prestressing What type of spring made in the form of

B. Friction dished washer?
C. Fretting
A. Air spring
D. Carving
B. Volute spring
Ans. C C. Believille spring
D. Motor spring
What type of bolt threaded on both ends
and can be used where a through bolt Ans. C
impossible?
What is the minimum number of teeth on a
A. Coupling smaller sprocket for high speed?
B. Stud bolt
A. 12
C. Carriage bolt
B. 21
D. Machine bolt
C. 24
Ans. B D. 14

What type of bolt distinguished by a Ans. B

short potion of the shank underneath the
Which of the following is the minimum
head being square or finned or ribbed?
number of teeth on a smaller sprocket for
A. Coupling moderate speed?
B. Stud bolt
A. 15
C. Carriage bolt
B. 12
D. Machine bolt
C. 21
Ans. C D. 17

What is the term applied to the Ans. D

reciprocal of the velocity ratio?
What is the minimum number of teeth on a Calculate the minimum shaft diameter
smaller sprocket for low speed? based on pure torsion.

A. 11 A. 9 mm
B. 17 B. 11 mm
C. 21 C. 13 mm
D. 12 D. 15 mm

Ans. 12 Ans. B

Two shaft at right angles to each other A 100 mm diameter solid shaft is to be
may be connected by what arrangement? replaced with a hollow shaft equally
strong (torsion) and made of the same
A. Half turn material. The outside diameter of the
B. turn hollow shaft is to 27 mm. What should be
C. Quarter turn the inside diameter? The allowable
D. One turn shearing stress is 41.4 MPa?

Ans. C A. 107.42 mm
B. 105.82 mm
What is the recommended initial tension
C. 291.53 mm
of the belt?
D. 109.60 mmw
A. 75 lb/in of width
Ans. A
B. 71 lb/in of width
C. 73 lb/in of width If the weight of 6 diameter by 48 long
D. 80 lb/in of width SAE 1030 shafting is 174.5 kg then what
will be the weight of chromium SAE 51416
Ans. A
of same size?
What factor of safety is needed for a 2
A. 305.79 lbs
in. diameter shaft with an ultimate
B. 426.70 lbs
strength of 50,000 psi to transmit 40,000
C. 347.96 lbs
in-lb torque.
D. 465.89 lbs
A. 2.25
Ans. C
B. 1.95
C. 2.14 A 50 inches diameter diamond saw blade is
D. 2.62 mounted on a pulley driven steel shaft,
required a blade peripheral linear speed
Ans. D
of 150 ft/sec. Motor drive is 125 hp at
A round steel shaft transmits 373 watts 1,200 rpm, with 6 inches diameter pulley.
at 1800 rpm. The torsional deflection is Determine the shaft rpm to attain blade
not to exceed 1 deg in a length equal to peripheral speed required.
20 diameters. Find the shaft diameter.
A. 716.2 rpm
A. 6.53 mm B. 635.3 rpm
B. 8.72 mm C. 539.10 rpm
C. 12.84 mm D. 687.55 rpm
D. 18.16 mm
Ans. D
Ans. A
A steel shaft transmits 40 hp at 1400
A steel shaft operates at 186 rad/s and rpm. Considering allowable shearing
must handle 2 kW of power. The shearing stress based on pure torsion to be 5000
stress is not to exceed 40 MN/m. psi, find the torsional deflection of the
shaft in degrees per foot.
 A. 0.392 degrees/foot ans: B
B. 0.246 degrees/foot
C. 0.541 degrees/foot The ability of a material to absorb
energy within is proportional limit is
D. 0.435 degree/foot
known as
a. resilience
Ans. B
b. endurance
c. toughness
The process by which high pressure is
d. spring action
applied to a heated metal billet or blank
which causes it to flow through ans: A
restricted orifice.
A method whereby a gear is run with
A. Extrusion another gear that has abrasive surface
B. Intrusion material.
C. Forging a. hobbing
b. honing
D. Hot rolling
c. lapping
d. milling
Ans. A
ans. C
A tolerance where the size of a part is
permitted to be either larger or smaller A multiple disc clutch of 10 steel disc
than the given dimension. and 9 bronze disc. the effective outside
and inside diameter are 20.32 cm and
A. Bilateral 15.24 cm, respectively if the axial force
B. Unilateral of 450 Newton is applied and the shaft
C. Lateral turns at 1200 rpm, find the horsepower
D. None of these capacity, assume a coefficient of
friction of 0.27.
Ans. A a. 39.566 hp
b. 40.482 hp
In a pressure vessel, the ratio of c. 37.456 hp
d. 35. 659 hp
minimum strength of joint to the strength
of solid joint is known as Ans: A
A. Efficiency An engine of a motor vehicle with a wheel
B. Performance factor diameter of 712 mm develops 50 kW at
C. Joint efficiency 2,000 rpm. the combined efficiency of the
D. Relative strength differential and tranmission is 75% with
an overall speed reduction of 25 is to 1.
Ans. D Determine the speed reduction of travel
of the vehicle in km/hr.
When tested in compression, ductile a. 10.74
material usually exhibit________ b. 11.69
c. 12.58
characteristics up to the yield strength
d. 13.80
as they do when tested in tension.
Ans: A
a. the same
b. less than An engine of a motor vehicle with a wheel
c. more than diameter of 712 mm develops 50 kW at
d. approximately the same 2,000 rpm. the combined efficiency of the
differential and transmission is 75% with
ans. D an overall speed reduction of 25 is to
1. determine the speed reduction of
In pure torsion, the maximum stress is at travel of the vehicle in km/hr.
the center of the a. 10.74
a. peripheral sides b. 11.69
b. long sides c. 12.58
c. medium sides d. 13.80
d. short sides
Ans. A

An engine of a motor vehicle with a wheel

diameter of 712 mm develops 50 kW at
2,000 rpm combined efficiency of the
differential and transmission is 75% with
an over-all speed reduction to. 1
determine he torque to be delivered by
the clutch N-m.
a. 239 N-m
b. 359 N-m
c. 432 N-m
d. 471 N-m

Ans: A

The large diamter and face of the disk of

a multiple disk clutch are 255 mm and 25
mm respectively the helical compression
spring used to engage the clutch has 9
and 1/2 effective coils of 10 mm steel
wire. the outer coil diameter is 80 mm.
the free length of the spring is 185 mm.
when in place with clutch engaged, its
length is 130 mm. Assuming that there is
10 pairs of friction surface in contact,
that the motor runs at 1200 rpm, f=0.15,
determine axial force available for the
clutch.
a. 1,688 N
b. 2,493 N
c. 1,542 N
d. 2,783 N

Ans: A

A flange bolt coupling consist of eight

steel 20 mm diameter steel bolts spaced
evenly around a bolt circle 300 mm in
diamter. if the coupling is subjected to
a torque of 15.1 KN-m, determine the
maximum shearing stress in the bolts?
a. 40450 kPa
b. 63320 kpa
c. 40054 kpa
d. 31298 kpa

Ans: C

a flange coupling is to be designed,

using 25 mm diameter bolts at a distance
of 152 mm from the center of the shaft.
allowable shearing stress on the bolt is
103 Mpa. if the shaft is to transmit
5,600 hp at a speed of 1200 rpm, how many
bolts are needed in the connection?
a. 2
b. 3
c. 4
d. 5

Ans: D