Mechanical Engineering MCQs

Page No. 175

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


a2-stroke engine


b4-stroke petrol engine


c4-stroke diesef engine


dgas turbine


View Answer gas turbine

High air-fuel ratio is used in gas turbines______________________?


ato increase the output


bto increase the efficiency


cto save fuel


dto reduce the exit temperature



In jet engines the compression ratio__________________?


avaries as square root of the speed


bVaries linearly to the speed


cvaries as square of the speed


dvaries as cube of the speed



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


a10: 1


b15: 1


c20 : 1


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


cnitrogen


dhydrogen



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


bincrease first at slow rate and then fast


cdecrease continuously


dfirst increase, reach maximum and then decrease



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


atoughness


bfatigue


ccreep


dcorrosion resistance


View Answer creep

Fighter bombers use following type of engine __________________?


aturbo-jet


bturbo-propeller


crocket


dram-jet ,


View Answer turbo-jet

The blades of gas turbine are made of_________________?


amild steel


bstainless steel


ccarbon steel


dhigh nicket alloy (neimonic)



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


asame


bhigher


clower


duncomparable


View Answer lower

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