1. What will be the power if the PLAN for both 2-stroke and 4-stroke engine is same?
2. What is the indicator diagram?
3. What are the purpose of taking indicator diagram?
4. What are the types of indicator diagram?
5. What is indicated power? How to calculate power?
6. Steps to take indicator diagram?
7. Purpose of Power diagram, Out-of-phase diagram, Compression diagram, Light spring diagram?
8. When indicator diagram is taken?
9. What are the necessary precaution to avoid indicator malfunction?
10. What are the steps to be taken when compression pressure is low?

Compressed Air System (Set 4)


Multiple Choice Questions


1. Which of the following frequent maintenance procedures is required of compressed air receivers?




2. The heat of compression is partially removed from compressed air by ____________.




3. An air compressor is equipped with an intercooler to ____________.
I. increase the efficiency of the compressor
II. reduce the cylinder operating temperature




4. If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably ____________.




5. According to Regulations , all pressure vessels other than unfired steam boilers shall be protected by pressure-relieving devices that prevent the pressure from rising more than ____________ above the maximum allowable working pressure.




6. A compressor operating with an accumulation of dust andgrease on the surfaces of an intercooler would result in ____________.
I. a decrease in volumetric efficiency of the compressor
II. higher volume of air to be discharged to the receiver




7. One of the main differences between a propeller pump and a centrifugal pump is the absence of a ____________.




8. If the intercooler of a low pressure air compressor becomes fouled either internally or externally, the ____________.




9. Why should a person performing maintenance on an air compressor wire and tag the system valves closed?




10. If the foundation bolts of a reciprocating air compressor are loose, which of the conditions below will occur?