SPPU Mechanical Engineering (Semester 7)
Industrial Fluid Power
May 2014
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2
1 (a) Explain the different types of hydraulic fluids.
8 M
1 (b) Differentiate between different types of hydraulic filters.
8 M

2 (a) What are the functions of hydraulic reservoirs? State different types of reservoirs.
8 M
2 (b) Explain the different types of hydraulic seals used in fluid power system.
8 M

Answer any one question from Q3 and Q4
3 (a) What are the various functions of hydraulic accumulators?
9 M
3 (b) Explain the working of radial piston pump with a neat sketch.
9 M

4 (a) Explain with a neat sketch the working of 4/3 tandem centered Direction Control Valve with a typical application.
10 M
4 (b) Explain the advantages of pilot operated pressure relief over direct operated PRV.
8 M

Answer any one question from Q5 and Q6
5 (a) Explain with a neat sketch the working of Temperature compensated flow control valve.
8 M
5 (b) Describe the functions of check valve used in hydraulic system with simple circuits.
8 M

6 (a) Draw symbols for

i) FRL
ii) Filter
iii) Heater
iv) Counter balance valve
V) Pilot operated check valve
vi) closed centered DCV
vii) Reservoir
viii) Cushioned cylinder.
8 M
6 (b) Explain the working of pilot operated pressure reducing valve.
8 M

Answer any one question from Q7 and Q8
7 (a) What is the purpose of providing cushioning in cylinders? With the help of neat sketch explain how it is achieved?
8 M
7 (b) Draw and explain regenerative circuit used in hydraulic system.
8 M

8 (a) Discuss different cylinder mounting methods with neat sketches.
8 M
8 (b) Analyze the given hydraulic circuit.

8 M

Answer any one question from Q9 and Q10
9 (a) Draw a simple sketch and explain in short the compressed air system in a medium scale industry.
8 M
9 (b) Describe with neat sketch:
i) Shuttle Valve
ii) Quick exhaust valve.
8 M

10 (a) Explain with a neat sketch the working of time delay valve used in pneumatic circuit.
8 M
10 (b) Draw and explain hydraulic circuit for automatic reciprocation of a hydraulic cylinder using sequencing valves.
8 M

Answer any one question from Q11 and Q12
11 (a) Sequential operations of two pneumatic cylinders are required as follows:
i) Cylinder 'A' extends,
ii) Cylinder 'B' extends,
iii) Cylinder ?B? retracts,
iv) Cylinder 'A' retracts.
Develop a pneumatic circuit using starting valve, pilot operated 4/2 direction control valve and cam / roller operated valves to maintain proper sequence. Do not use solenoid operated valves.
6 M
11 (b) Why pneumatic system is termed as low cost automation?
6 M

12 A machine slide is moved by means of hydraulic cylinder. The motion of the cylinder is as follows:
a) Initially it moves through a distance of 250 mm against a load of 15000 N in about 5 seconds.
b) It is followed by a working stroke of 100 mm against an effective load of 35000 N. The feed rate during this part of the stroke is required to be between 0.5 to 1.0 m/min.
c) The return stroke is to be as fast as possible.
A meter out circuit is to be used. Draw a circuit which will fulfil these requirements.
Select different components you have used in the circuit from the given data. Note: Data sheet for question no. 12.

Refer from PDF
18 M

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