Mechanical Engineering MCQs

Page No. 174

The efficiency of jet engine is__________________?


ahigher at ground

✖


bhigher at high altitudes

✓


csame at all altitudes

✖


dhigher at high speed

✖



In air breathing jet engine, the jet is formed by expanding__________________?


agases

✖


bsolids

✖


cliquid

✖


dhighly heated atmospheric air

✓



Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?


a2500°C

✖


b2000°C

✖


c1500°C

✖


d700°C

✓


View Answer 700°C

Reheating in multistage expansion gas turbine results in____________________?


ahigh thermal efficiency

✖


breduction in compressor work

✖


cdecrease of heat loss in exhaust

✖


dmaximum work output

✓


View Answer maximum work output

Gas turbine cycle with Regenerator __________________?


aincreases thermal efficiency

✓


ballows high compression ratio

✖


cdecreases heat loss is exhaust

✖


dallows operation at very high altitudes

✖



The main purpose of reheating in gas turbine is to__________________?


aincrease temperature

✖


breduce turbine size

✖


cincrease power output

✓


dincrease speed

✖


View Answer increase power output

Work ratio of a gas turbine plant is ratio of______________________?


anet work output and work done by turbine

✓


bnet work output and heat supplied

✖


cwork done by turbine and heat supplied

✖


dwork done by turbine and net work output

✖



In the aircraft propellers __________________?


athe propulsive matter is caused to flow around the propelled body

✖


bpropulsive matter is ejected from within the propelled body

✖


cits functioning does not depend on presence of air

✖


dall of the above

✓


View Answer all of the above

Work ratio of a gas turbine may be improved by f____________________?


adecreasing the compression work

✖


bincreasing the compression work

✖


cincreasing the turbine work

✖


dA. and C. above

✓


View Answer A. and C. above

Reheating in gas turbine results in___________________?


aincrease of work ratio

✖


bdecrease of thermal efficiency

✖


cdecrease of work ratio

✖


dboth A. and B. above

✓


View Answer both A. and B. above

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