EKM CH 3.1 | AIR COMPRESSOR | MEO 4 & 5

 MOTOR ENGINEERING KNOWLEDGE

MEO CLASS 4 & 5 COMBINED

Question Bank by DoS Bangladesh

3.0 AUXILIARY MACHINERY 3.1 AIR COMPRESSOR

1. With respect to reciprocating air compressors: 

 (a) Define Bumping clearance. (2) 

 (b) State the effect of incorrect Bumping Clearance on compressor efficiency. (4) (c) How the bumping clearance can be adjusted? (4) 

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2. (a) with a cross-sectional drawing describe the principal of two stage an air compressor (6) 

 (b) Explain the purpose and precautions of the air compressor explosion. (4) 

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3. (a) What is bumping clearance? (2) 

 (b) What is the necessity of inter stage cooler in an air compressor? (4) 

 (c) What are the safety devices incorporated in a reciprocating air compressor? (4) 

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4. With reference to reciprocating multistage air compressor, state why: 

 (a) Clearance volume needs to be as small as possible. (3) 

 (b) Suction & delivery valve are of plate type. (3) 

(c) Intercooler is incorporated. (4) 

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5. (a) How many types of compressor? Why reciprocating type of compressor commonly used? (6) 

 (b) What are the safety devices incorporate in air compressor and air bottle? (4) 

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 6. (a) Draw a 2-stage air compressor by indicating all parts. (6) 

 (b) How to carry out air compressor performance test? (4) 

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