Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act, 1956)
Course & Branch: B.E – Mechanical
Title of the Paper: Fluid Power Systems
Sub. Code: 515705-615703(2006-07)
Date: 08/03/2011
Max. Marks: 80
Time: 3 Hours
Session: FN
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1.
PART - A
(10 X 2 = 20)
Answer ALL the Questions
What are the basic components of hydraulic and pneumatic
system?
2.
State the difference between hydraulic cylinders and hydraulic
motors?
3.
Differentiate between pressure limiting and pressure regulating
valves.
4.
Define the terms (a) Fluid Reservoir (b) Strainers.
5.
What is the function of pressure intensifier?
6.
Draw the graphical symbols for (a) Solenoid (b) Relay coil?
7.
What is the function of bleed off circuit?
8.
What is a fail safe circuit?
9.
Differentiate between air filter and muffler.
10. What are servo valves and its functions?
PART – B
(5 x 12 = 60)
Answer All the Questions
11. (a) Explain the construction and working of a gear pump. (8)
(b) What is cylinder cushioning? Explain with diagram.
(4)
(or)
12. (a) Discuss the properties of the hydraulic fluids.
(b) With neat sketches explain pump characteristics.
(4)
(8)
13. (a) Explain the operational features of the check valve.
(6)
(b) With neat sketch explain the weight loaded accumulator. (6)
(or)
14. (a) With neat sketch explain the working principle of pressure
relief valve.
(b) Write short notes on (a) Limit switches (b) Proportional relief
valve.
15. With neat sketch explain regenerative circuit and derive the
expression for the ratio of extending and retracting speeds of the
cylinder?
(or)
16. (a) Draw the circuit for control the retracting speed of the
hydraulic cylinder by using flow control valve.
(b) What is PLC? Give an example of rungs in a ladder diagram.
17. Design a circuit for an automatic cylinder reciprocating system?
(or)
18. Design a circuit for punching press application?
19. (a) With neat sketch explain an air lubricator?
(b) Calculate the actual power required to drive a compressor that
delivers air at 3.5 m3/min at 8 bar gauge. The over all efficiency
of the compressor is 74%.
(or)
20. (a) With neat sketch explain hydropneumatic circuit.
(8)
(b) Compare hydropneumatic system with hydraulic and
pneumatic systems.
(4)