Mechanical Engineering MCQs

Page No. 175

In which case the air-fuel ratio is likely to be maximum _________________?


a2-stroke engine

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b4-stroke petrol engine

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c4-stroke diesef engine

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dgas turbine

✓


View Answer gas turbine

High air-fuel ratio is used in gas turbines______________________?


ato increase the output

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bto increase the efficiency

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cto save fuel

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dto reduce the exit temperature

✓



In jet engines the compression ratio__________________?


avaries as square root of the speed

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bVaries linearly to the speed

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cvaries as square of the speed

✓


dvaries as cube of the speed

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Air-fuel ratio in a jet engine will be of the order of__________________?


a10: 1

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b15: 1

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c20 : 1

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d60 : 1

✓


View Answer 60 : 1

The effective power of gas turbines is increased by adding the following in compressor__________________?


aammonia and water vapour

✓


bcarbon dioxide

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cnitrogen

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dhydrogen

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The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?


aincrease first at fast rate and then slow

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bincrease first at slow rate and then fast

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cdecrease continuously

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dfirst increase, reach maximum and then decrease

✓



The following property is most important for material used for gas turbine blade___________________?


atoughness

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bfatigue

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ccreep

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dcorrosion resistance

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View Answer creep

Fighter bombers use following type of engine __________________?


aturbo-jet

✓


bturbo-propeller

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crocket

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dram-jet ,

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View Answer turbo-jet

The blades of gas turbine are made of_________________?


amild steel

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bstainless steel

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ccarbon steel

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dhigh nicket alloy (neimonic)

✓



The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?


asame

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bhigher

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clower

✓


duncomparable

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View Answer lower

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