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13.

Euler's equation is applicable for                        
A. centrifugal compressor B. axial compressor
C. pumps D. all of the above



14.

For a compressor, least work will be done if the compression is                        
A. is entropic B. isothermal
C. poly tropic D. somewhere in between is entropic and isothermal



15.

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will                        
A. increase B. decrease
C. remain unaffected D. other factors control it




16.

For minimum work in multistage compression, assuming same index of compression in all stages                        
A. work done in first stage should be more B. work done in subsequent stages should increase
C. work done in subsequent stages should decrease D. work done in all stages should be equal



17.

For slow-speed large capacity compressor, following type of valve will be best suited                        
A. poppet valve B. mechanical valve of the corliss, sleeve, rotary or semirotary type
C. disc or feather type D. any of the above



18.

For supplying intermittent small quantity of air at high pressure, following compressor is best suited                        
A. centrifugal B. reciprocating
C. axial D. screw



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