Mechanical Engineering MCQs

Page No. 179

The ideal efficiency of simple gas turbine cycle depends on________________?


apressure ratio


bmaximum cycle temperature


cminimum cycle temperature


dall of the above


View Answer pressure ratio

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?


aremain same


bdecrease


cincrease


dunpredictable


View Answer increase

The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of________________?


a50%


b75%


c85%


d99%


View Answer 99%

Water gas is produced by ___________________ ?


acarbonisation of coal


bpassing steam over incandescent coke


cpassing air and a large amount of steam over waste coal at about 65°C


dpartial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast



The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?


aincreases


bdecreases


cfirst increases and then decreases


dfirst decreases and then increases


View Answer increases

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?


aheated


bcompressed air before entering the combustion chamber is heated


cbled gas from turbine is heated and readmitted for complete expansion


dexhaust gases drive the compressor



Efficiency of gas turbine is increased by________________ ?


areheating


binter cooling


cadding a regenerator


dall of the above


View Answer adding a regenerator

The hottest point in a gas turbine is______________________?


aat the base


bat the tip


cin the center


dbetween ~ to i of the blade height



Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?


ahigher


blower


cequal


dcan’t be compared


View Answer lower

The pressure ratio in gas turbines is of the order of__________________?


a2:l


b4:1


c61: 1


d9 : 1


View Answer 61: 1

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