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.
