Mechanical Engineering MCQs

Page No. 183

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___________________?


aincrease

✓


bdecrease

✖


cremain unaffected

✖


dother factors control it

✖


View Answer increase

The criterion of the thermodynamic efficiency for rotary compressor is_________________?


aisentropic compression

✓


bisothermal compression

✖


cpolytropic compression

✖


dany one of the above

✖



The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?


a0.1%

✖


b0.5%

✖


c1%

✓


d5%

✖


View Answer 1%

For minimum work in multistage compression, assuming same index of compression in all stages_________________?


awork done in first stage should be more

✖


bwork done in subsequent stages should increase

✖


cwork done in subsequent stages should decrease

✖


dwork done in all stages should be equal

✓



Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?


aless power requirement

✖


bbetter mechanical balance

✖


cless loss of air due to leakage past the cylinder

✖


dlower volumetric efficiency

✓



For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________?


acentrifugal

✖


breciprocating

✓


caxial

✓


dscrew

✖


View Answer reciprocating

Diffuser in a compressor is used to _____________________?


aincrease velocity

✖


bmake the flow stream-line

✖


cconvert pressure energy into kinetic energy

✖


dconvert kinetic energy into pressure energy

✓



Phenomenon of choking in compressor means __________________?


ano flow of air

✖


bfixed mass flow rate regardless of pressure ratio

✓


creducing mass flow rate with increase in pressure ratio

✖


dincreased inclination of chord with air steam

✖



The ratio of isentropic work to Euler work is known as_____________________?


apressure coefficient

✓


bwork coefficient

✖


cpolytropic reaction

✖


dslip factor

✖


View Answer pressure coefficient

The indicated work per unit mass of air delivered is___________________?


adirectly proportional to clearance volume

✖


bgreatly affected by clearance volume

✖


cnot affected by clearance volume

✓


dinversely proportional to clearance volume

✖



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