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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