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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