22655
21222
3 Hours / 70 Marks Seat No.
15 minutes extra for each hour
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any FIVE of the following. 10
a) State two advantages and two disadvantages of oil hydraulic
systems.
b) Define term viscosity index
c) Draw ISO symbols of pressure compensated flow control
valve with reverse free flow.
d) State two designs of fixed displacement pumps and two
designs of variable displacement pumps. (names only)
e) Sketch a typical graph of performance characteristic of
variable displacment vane pump.
f) Draw ISO symbols to show two different centre positions of
DC valves.
g) Sketch a cross sectional diagram of a shuttle valve.
P.T.O.
22655 [2]
Marks
2. Attempt any THREE of the following. 12
a) Sketch and explain working of unbalanced vane pump.
b) In mobile hydraulics application a single acting cylinder of
very long stroke length is required. Due to space limitation
it should occupy less space after refraction. Sketch and
explain suitable actuator required for given condition.
c) State any two methods of actuation of DC valve with their
symbols.
d) Draw a neat sketch and explain working of pressure and
temperate compensated flow control valve.
3. Attempt any THREE of the following. 12
a) Draw a cross sectional diagram of a time delay valve and
explain its working.
b) Sketch and explain construction of pressure reducing valve.
c) Explain the construction of spring loaded accumulator with
neat sketch.
d) Draw neat sketch of a lubricator used in Pneumatic systems.
e) Classify air compressors. Write any one application of each
compressor.
4. Attempt any TWO of the following. 12
a) Compare Relief and sequence pressure control valves on
following points
i) Symbol
ii) Outlet port
iii) Pilot connection
iv) Drain
v) Application
b) Explain with neat sketch of Hydraulic circuit used in
shaping machine.
c) In an application two hydraulic cylinders are required to move
forward simultaneously with the same speed and same stroke
length. Sketch a suitable circuit diagram and explain its working.
22655 [3]
Marks
5. Attempt any TWO of the following. 12
a) In a pneumatic application Piston has to move back and
forth continuously. Draw pneumatic circuits using
i) Roller operated and pilot operated DC valves.
ii) Solenoid operated DC valve and limit switches.
b) Explain with neat sketch of pneumatic circuit used for speed
control of air motor.
c) Explain constructional details of Internal Gear type hydraulic
motor with neat sketch.
6. Attempt any THREE of the following. 12
a) i) List two components used in pneumatic systems but
not used in Hydraulic system with their symbols.
ii) Draw a cross section of Hose pipe used in Hydraulics
and name the layers.
b) List common faults observed in Hydraulic and pneumatic
systems and state their remedies.
c) With a suitable circuit diagram explain the use of shuttle
valve (Logic ‘OR’ gate) in Pneumatic low cost automation.
State its application.
d) Sketch a counter balance hydraulic circuit, name its parts.
22655
12223
3 Hours / 70 Marks Seat No.
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answer with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any FIVE of the following: 10
a) Draw I.S. symbol for :–
i) 4/ D.C.V.
3
ii) Sequence valve.
b) Define :–
i) Viscosity
ii) Specific weight
c) State applications of Linear and Rotary actuator.
d) List various factors considering while selection of pump.
e) State the different functions of valves.
f) State the different types of filters used in fluid system.
g) State the common faults that can be observed in Pneumatic
circuit.
P.T.O.
22655 [2]
Marks
2. Attempt any THREE of the following: 12
a) State the advantages and limitations of hydraulic and pneumatic
systems.
b) Explain the working of Tandem cylinder with neat sketch.
c) Explain the working of check valve with neat sketch.
d) Explain with neat sketch working of any one rotary compressor.
3. Attempt any THREE of the following: 12
a) Compare gear pump and vane pump on the basis of :–
i) Construction
ii) Speed
iii) Application
iv) Pressure.
b) Explain the working of sequence valve with neat sketch.
c) Compare between meter in and meter out circuit.
d) A machine holds the steel sheet and then punches a hole. The
sheet is released when the punch goes back. Suggest and draw
the suitable circuit for this situation.
4. Attempt any THREE of the following: 12
a) Explain with neat sketch working of 3/2 DCV.
b) Give the classification of control valves.
c) Explain flexible hose. State its material and application.
d) Construct Pneumatic circuit using sequence valve to control
two applications performed in a proper sequence and describe
its working.
e) Draw the neat labelled hydraulic circuit of milling machine and
explain its working.
22655 [3]
Marks
5. Attempt any TWO of the following: 12
a) Draw and explain two pump unloading circuit.
b) Mention any two faults detected in pneumatic circuit and give
its causes and remedies.
c) Discuss the situations in which following type of centre position
of DC valves are preferred :–
i) All ports open
ii) Tandem centre.
6. Attempt any TWO of the following: 12
a) It is required to delay the controlling action by some time after
the actuation of DC valve. Select the suitable valve for this
application and explain its working with neat sketch.
b) One application needs a single acting cylinder capable of
giving longer stroke strength. However, the space available to
fit in that cylinder in retracted condition is comparatively less.
Suggest the type of actuator to be used in such condition with
justification. Explain its working with sketch.
c) Differentiate between Hydraulic and Pneumatic system.
(Minimum six points.)
22655
22223
3 Hours / 70 Marks Seat No.
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any FIVE of the following: 10
a) State desirable properties of hydraulic oil used in hydraulic
system.
b) List different safety precautions required for handling industrial
pneumatic system.
c) State two applications of double acting cylinder.
d) List the types of positive displacement pump.
e) State different types of control valves.
f) State function of seal and gaskets.
g) State the common application of hydro-pneumatic system.
2. Attempt any THREE of the following: 12
a) Explain working of hydraulic system with its general layout.
b) Compare positive displacement pump with non-positive
displacement pump.
c) Explain construction and working of sliding spool type 4/3
direction control valve.
d) Explain function of FRL unit with neat sketch. P.T.O.
22655 [2]
Marks
3. Attempt any THREE of the following: 12
a) Explain principle and working of external gear pump with sketch.
b) Explain need of pressure and temperature compensation in flow
control valve.
c) Draw meter-out Hydraulic circuit.
d) It is required to move two or more number of cylinder
simultaneously. Draw the suitable circuit for this application.
4. Attempt any THREE of the following: 12
a) State the function of pressure control valve and flow control valve.
b) Explain with neat sketch working of pressure relief valve.
c) Explain with neat sketch working of centrifugal compressor.
d) Draw the neat labeled hydraulic circuit of milling machine.
e) Discuss the remedies and fault detection in pneumatic circuits.
5. Attempt any TWO of the following: 12
a) One application needs a single acting cylinder capable of giving
longer stroke strength. However the space available to fit in that
cylinder in retracted condition is comparatively less. Suggest the
type of actuator to be used in such condition with justification.
Explain its working with neat sketch.
b) Describe construction and working of Pilot operated check valve
with neat sketch.
c) Explain construction and working of “Time Delay Valve.”
With neat sketch.
6. Attempt any TWO of the following: 12
a) Describe the routine maintenance procedure of hydraulic circuit
of shaper machine.
b) Construct pneumatic circuit using sequence valve to control two
applications performed in a proper sequence and describe its
working.
c) Draw and explain pneumatic circuit to control the speed of
double acting cylinder.
22655
23124
3 Hours / 70 Marks Seat No.
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answer with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Use of Non-programmable Electronic Pocket
Calculator is permissible.
(7) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any FIVE of the following: 10
a) Compare Hydraulic and Pneumatic system.
b) Draw. IS. symbols of –
i) Dead weight accumulator.
ii) Unloading valve.
c) Which pump is suitable for low pressure and high pressure
hydraulic pump.
d) State application for double acting Cylinder and motor.
e) State the difference between counter balance valve and unloading
valve.
f) State the use of FRL unit and time delay valve.
g) State the common faults that can be observed in Hydraulic
circuits.
P.T.O.
22655 [2]
Marks
2. Attempt any THREE of the following: 12
a) List different safety precautions required for handling Industrial
Hydraulics and Pneumatics system.
b) Explain the construction and working of Gear type motor with
neat sketch.
c) Explain two application of pressure control valve with suitable
sketch.
d) Explain with neat sketch double acting reciprocating compressor.
3. Attempt any THREE of the following: 12
a) Enlist four faults and remedies for Hydraulic pump.
b) Explain with neat sketch pressure compensated flow control
valve, give it’s application.
c) Draw Hydraulic circuit for Grinding machine and explain its
working.
d) A mild steel block holds the machine and then drill the hole
the block is released when drill goes back. Suggest and draw
the suitable circuit for this situation.
4. Attempt any THREE of the following: 12
a) Enlist different center positions with sketch.
b) Explain with neat sketch sequence valves.
c) Explain any four accessories used in pneumatic system.
d) For CNC machine select a suitable circuit for door opening
and closing at same speed. Explain with circuit diagram.
e) Draw and explain Meter-In circuit in Pneumatic system.
22655 [3]
Marks
5. Attempt any TWO of the following: 12
a) In a dumping truck needs cylinder of giving longer stroke
strength suggest the type of actuator to be used with justification.
Explain its working with sketch.
b) Discuss the situation in work-shop shifting CNC machine one
place over another place by using hydraulic lifter suggest type
of D.C.V., P.C.V. and F.C.V. with justification.
c) It is required to delay the controlling action by sometime after
the actuation of DC valve. Select the suitable valve for this
application and explain its working with neat sketch.
6. Attempt any TWO of the following: 12
a) Draw and explain time delay circuit for Broaching operation.
b) There are two hydraulic cylinder which operate in sequence.
Forward stroke of first cylinder, take place followed by automatic
forward stroke of second cylinder. However retraction takes
place first in second cylinder followed by the same in first
cylinder. Draw suitable circuit and name all components.
c) A Hydraulic bending machine can be operated from both the
side. Draw pneumatic circuit which ensures both hands safety
of the worker while operating the machine from any side.
22655
23242
3 Hours / 70 Marks Seat No.
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1.
Attempt any FIVE of the following: 10
a) State two advantages and two limitations of Pneumatic system.
b) Draw ISO symbols for:
i) Pressure Relief Valve.
ii) 4/3 Direction control Valve.
c) Classify different types of Gear Pump.
d) State different types of actuators used for getting linear motions.
e) Differentiate between pressure relief valve and pressure reducing
valve.
f) State the function of FRL unit used in pneumatic system.
g) State the common faults that are observed in Hydraulic circuit.
P.T.O.
22655 [2]
Marks
2.
Attempt any THREE of the following: 12
a) Differentiate between Hydraulic system and Pneumatic system
on the basis of following points.
i) Working Medium
ii) Pressure Range
iii) Accuracy
iv) Applications
b) Explain with neat sketch working of Balanced type vane pump.
c) Explain with neat sketch working of Temperature Compensated
Flow control valve along with it’s symbol.
d) Classify Accumulator and explain weight loaded accumulator
with neat sketch.
3.
Attempt any THREE of the following: 12
a) Explain with neat sketch the linear actuator used in dumper
for lowering the material.
b) Explain with neat sketch the 4/3 direction control valve used
in hydraulic system.
c) Out of the three speed control methods, select one method
used for both positives as well as negative loading condition
and explain it with circuit diagram.
d) Draw and explain Regenerative circuit.
4.
Attempt any THREE of the following: 12
a) Classify the control valves used in hydraulic system.
b) Explain with neat sketch working of pilot operated pressure
relief valve.
c) Explain with neat sketch working of Double Acting compressor.
d) Draw and explain the suitable circuit, where second cylinder
will start it’s forward stroke after completion of forward stroke
of first cylinder by using sequence valve.
e) Explain with neat sketch Time Delay Valve.
22655 [3]
Marks
5.
Attempt any TWO of the following: 12
a) Draw and explain with neat sketch a linear actuator for an
application where two number of cylinders/pistons are connected
in series giving maximum force at the end of piston rod.
b) Discuss the situations in which following type of centre
position of 4/3 DC valves are preferred-
i) Centre tap.
ii) All ports open.
c) State Venturi effect and explain with neat sketch the function
of lubricator used in pneumatic system.
6.
Attempt any TWO of the following: 12
a) Draw and explain the hydraulic circuit used in milling machine
and also state the importance of booster pump used in circuit.
b) Draw and explain the pneumatic circuit used for speed control
of pneumatic motor rotating in clockwise and anticlockwise
direction.
c) List common faults observed in Hydraulic and pneumatic systems
along with their remedies.
22655
12425
03 Hours / 70 Marks Seat No.
Instructions – (1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answer with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Mobile Phone, Pager and any other Electronic
Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any FIVE of the following: 10
a) State any two advantages of oil hydraulic systems.
b) State the common applications of pneumatic system.
c) Draw ISO symbol of pressure relief valve and heat exchanger.
d) State the use of twin pressure valve and shuttle valve.
e) List the types of positive displacement pumps.
f) State different types of control valve.
g) State function of seal and gaskets.
P.T.O.
22655 [2]
Marks
2. Attempt any THREE of the following: 12
a) State any two methods of actuation of DC valve with their
symbols.
b) Sketch and explain construction of prenure reducing valve.
c) Explain the working of vain motor with a neat sketch.
d) Explain the construction and working of external gear type
pump.
3. Attempt any THREE of the following: 12
a) Compare gear pump and piston pump.
b) Give the classification of control valves used in fluid system.
c) Explain working of telescopic cylinder with neat sketch.
d) Draw a sketch of 4/2 way direction control valve and explain
it’s working.
4. Attempt any THREE of the following: 12
a) State any four types of accessories used in pneumatic system
along with their function.
b) Draw a cross sectional diagram of time delay valve and explain
it’s working.
c) Explain with neat sketch of Pilot operating prenure relief value.
d) Draw a neat sketch of a lubricator used in Pneumatic system.
e) What is FRL? states it’s important.
5. Attempt any TWO of the following: 12
a) Explain with neat sketch of hydraulic circuit used in milling
machine.
b) Explain with neat sketch of travel dependent sequencing circuits
with cam.
c) Explain with neat sketch of pneumatic circuit used for speed
control of air motor.
22655 [3]
Marks
6. Attempt any TWO of the following: 12
a) What is accumulator? Give the types of accumulator and explain
any one type of accumulator with sketch?
b) List common faults observed in Hydraulic system and state
their remedies.
c) Draw and explain ‘Time delay circuit’ in pneumatic system.
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 1– Introduction to Hydraulic & Pneumatic System
(06 M)
2 Marks Questions
1. Compare oil and air as a medium in fluid system
2. Draw I.S. symbols for i) Bi directional variable discharge pump and ii) Heat Exchanger
3. Draw I.S. symbols for following : i) Gas charged accumulator ii) Oscillatory Motor
4. Define term viscosity index
4 Marks Questions
1. List common faults observed in Hydraulic and pneumatic systems and state their
remedies.
2. List different Safety precautions required for handling Industrial hydraulics and
pneumatics systems
3. Describe essential properties of oil used in oil hydraulic circuits.
4. Give merits and demerits of hydraulic system.
5. Write any four applications of hydraulic system
6. State any four advantages and disadvantages of pneumatic system
7. Explain general layout of hydraulic system
8. Explain general layout of pneumatic system
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 2– Pumps and Actuators
(12 M)
2 Marks Questions
1. Classify Pumps
2. State two applications of double-acting cylinders
3. Differentiate between single acting and double acting cylinder
4 Marks Questions
1. What are selection criteria for hydraulic pumps?
2. Explain the working of vane motor with a neat sketch
Or
Sketch and explain working of unbalanced vane pump
3. Explain with neat sketch working of Gear Pump
4. Explain construction and working principle of internal gear pump.
Or
Explain constructional details of Internal Gear type hydraulic motor with neat sketch
5. Sketch and explain working of axial piston pump used in hydraulic system(Swash
plate piston pump or bent axis piston pump)
6. Explain with sketch working of screw pump
7. Explain with figure working of Gerotor pump
8. Explain with neat sketch working of tandem cylinder
9. With neat sketch describe construction and working of double acting pneumatic
cylinder
10. Describe with sketch working of telescope cylinder. State its application also.
Or
One application needs a single acting cylinder capable of giving longer stroke
strength. However the space available to fit in that cylinder in retracted condition is
comparatively less. Suggest the type of actuator to be used in such condition with
justification. Explain its working with sketch.
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 3– Control Valves
(16 M)
2 Marks Questions
1. State the difference between pressure relief valve and sequence valve
2. State methods of actuation of DC valve
4 Marks Questions
1. Give full classification of control valves used in fluid system
2. Explain with neat sketch working of Pressure reducing valve
3. Explain with neat sketch working of pressure relief valve
4. Explain with sketch working of sequence valve
5. Explain two applications of check valve with suitable diagram
6. Discuss the situations in which following types of center positions of DC valves are
preferred i) All ports open and ii) Tandem center
7. Explain with neat sketch working of 4/2 spool type DC valve
8. Draw a neat sketch and symbol of 3/2 normally closed poppet type D.C valve.
9. Classify flow control valve with their applications.
10. Explain the need of pressure and temperature compensation in flow control valve
11. Describe with sketch pressure compensated flow control valve.
12. State types of flow control valve. Explain non-pressure compensated flow control
valve.
13. Compare Relief and sequence pressure control valves on following points
i) Symbol ii) Outlet port iii) Pilot connection iv) Drain v) Application
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 6– Pneumatic Circuits
(12 M)
4 Marks Questions
1. A hydraulic press machine can be operated from both the sides. Draw a
pneumatic circuit which ensures both hands safely of the worker while
operating the machine from any side
2. Describe with neat sketch how speed of bidirectional air motor is controlled
3. Develop pneumatic circuit for operation of two D.A. cylinders that operates
sequentially.
4. Draw pneumatic circuit for speed control of D.A. cylinder in forward
direction. Write its applications
5. Draw pneumatic meter-in-circuit for air motor
6. Develop a pneumatic position based sequencing circuit by using all necessary
components
7. Explain time delay circuit in pneumatics
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 5– Oil Hydraulic Circuits
(12 M)
4 Marks Questions
1. Out of the three speed control methods, select the suitable one for hydraulic
shaper and explain it with circuit diagram
2. A machine holds the steel sheet and then punches a hole. The sheet is released
when the punch goes back. Suggest and draw the suitable circuit for this
situation
3. Draw and explain a suitable circuit in which two actuators move forward
simultaneous with same speed
4. Design and draw a hydraulic circuit to achieve following objectives i) piston
advances with uniform speed in the first half of forward stroke, ii) with
reduced speed in the next half of forward stroke and iii) return quickly
5. Draw well labelled circuit for continuous back and forth motion of piston
6. In an application two hydraulic cylinders are required to move forward
simultaneously with the same speed and same stroke length. Sketch a suitable
circuit diagram and explain its working.
7. Sketch a counter balance hydraulic circuit, name its parts
8. Draw well labelled circuit for milling machine and explain its working
9. Draw and explain two pump unloading circuit
10. Using double acting cylinder, flow control valve, with check valve, pressure
relief valve filter, D.C. valve, develop circuit for speed control during return
stroke.
11. Describe with sketch the working and application of meter-in–circuit.
12. Describe with sketch the working and application of meter-bleed off–circuit.
R. C. PATEL POLYTECHNIC, SHIRPUR
DEPARTMENT OF MECHANICAL ENGINEERING
Subject- Industrial Hydraulics & Pneumatics
(Subject Code-22655)
Unit 4– Compressor, Pneumatic components and Accessories
in fluid system
(12 M)
2 Marks Questions
1. State the use of twin pressure valve and shuttle valve
2. State the importance of FRL unit in pneumatic system
3. List various types of accessories used in hydraulic system
4. Draw logic OR circuit (Shuttle valve circuit)
5. Sketch a cross sectional diagram of a shuttle valve.
6. State different types of filters used in fluid system.
4 Marks Questions
1. Explain with neat sketch working of screw compressor
2. State any four types of accessories used in pneumatic system along with their
function
3. Explain with neat sketch working of quick exhaust valve
4. Why accumulators are used in hydraulic system? Explain any one of them
with neat sketch.
5. State any four functions of hydraulic seals and state any four reasons for seal
failure.
6. Give the function of FRL unit and also draw its symbol.
7. Sketch a cross sectional diagram of a shuttle valve.
8. Draw neat sketch of a lubricator used in Pneumatic systems..
9. Classify air compressors. Write any one application of each compressor.
10. Explain flexible hose. State its material and application
11.
