Mechanical Engineering MCQs

Page No. 173

The compression ratio in a gas turbine is of the roder of____________________?


a3.5 : 1

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b5 : 1

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c8 : 1

✓


d12 : 1

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View Answer 8 : 1

Ram-jet engine__________________?


ais self-operating at zero flight speed

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bis not self-operating at zero^flight speed

✓


crequires no air for its operation

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dproduces a jet consisting of plasma

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A simple turbo-jet engine is basically_________________?


aa propeller system

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bgas-turbine engine equipped with a propulsive nozzle and diffuse*

✓


cchemical rocket regine

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dram-jet enigne

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In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?


aless

✓


bmore

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csame

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dmay be less or more depening upon speed

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View Answer less

Pressure ratio in gas turbines is the ratio of ____________________?


acompressor pressure ratio

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bhighest pressure to exhaust pressure

✓


cinlet pressure to exhaust pressure

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dpressures across the turbine

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Which of the following plants is smallest and lightest for genrating a given amount of power__________________?


asteam power plant

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bpetrol engine

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cdiesel engine’

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dgas turbine plant

✓


View Answer gas turbine plant

Turbofan engine employs ____________________ ?


aone air stream

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btwo or more air streams

✓


cno air stream

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dsolid fuel firing

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The efficiency and work ratio of a gas turbine plant can be increased by _____________________?


ausing mulit-stage compressor with mfercooler

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badding heat exchanger

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cinjecting water in/around combustion chamber

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dall of the above

✓


View Answer all of the above

The compression ratio in a jet engine varies proportional to ____________________?


aaltitude

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bspeed

✓


cVspeed

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ddoes not Vary

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View Answer speed

For speed above 3000 km/hour, it is more advantageous to use____________________?


aturbo-jet engine

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bram-jet engine

✓


cpropellers

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drockets

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View Answer ram-jet engine

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