Q9. With simple sketch explain working of Direct acting pressure reducing valve and Pilot operated pressure reducing valve. Define state of equilibrium with respect to reducing valves.
Q8. A. Explain the necessity of intercoolers on a multi-stage compressor. What attention is required to keep them safe and in good working order? Sketch and describe an intercooler suitable for a 2400kPa compressor and state materials used.
B. What attention is needed before opening up an air compressor for inspection?
C. What faults are likely to develop in an air compressor and how are they remedied?
Q2. With reference to reciprocating air compressors explain why.
A. Clearance volume is critical to efficiency.
B. Spring-loaded plate valves are invariably used.
C. Compression is accomplished in apparently unequal stages.
D. Inter cooling is used between stages.
Q5. With reference to the operation of two stage reciprocating air compressors explain the following:
a. Advantages of Multistage compression.
b. Significance of bumping clearance and adjustment thereof.
c. Reasons for reduction of compressor capacity.
d. Reasons and Effects of Second stage suction valve leakage.
Q8. A. Sketch, and describe, a valve suitable for reducing air pressure and maintaining the reduced pressure within close limits. B. Describe the processes through which air from the starting air receivers should be treated before it is used in a pneumatic control system.
Q9. Give reasons why each of the following features is considered desirable in air compressors. A. Smooth air passages with minimum obstruction at valves; B. Minimum clearance volume C. Multi-tubular heat exchangers; D. Generous size of suction filter.
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