Mechanical Engineering MCQs

Page No. 178

Water is injected in gas turbine cycle to___________________?


acontrol temperature

✖


bcontrol output of turbine

✓


ccontrol fire hazards

✖


dincrease efficiency

✖



The closed cycle in gas turbines_________________?


aprovides greater flexibility

✓


bprovides lesser flexibility

✖


cin never used

✖


dis used when gas is to be burnt

✖



The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?


aadiabatic temperature drop in the stage

✖


btotal temperature drop

✖


ctotal temperature drop in the stage

✓


dtotal adiabaitc temperature drop

✖



A gas turbine used in air craft should have______________________?


ahigh h.p. and low weight

✖


blow weight and small frontal area

✓


csmall frontal area and high h.p.

✖


dhigh speed and high h.p.

✖



Producer 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 coal, coke, anthracite coal or charcoal in a mixed air steam blast

✓



For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?


apressure ratio alone

✖


bmaximum cycle temperature alone

✖


cminimum cycle temperature alone

✖


dboth pressure ratio and maximum cycle temperature

✓



It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?


ait is inefficient

✖


bit is bulky

✖


cit requires cooling water for its operation

✓


dnon of theses

✖



As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?


aincreases

✓


bdecreases

✖


cremains same

✖


dfirst increases and then decreases

✖


View Answer increases

The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?


amore

✖


bless

✓


csame

✖


ddepends on other factors

✖


View Answer less

The material commonly used for air craft gas turbine is__________________?


astainless steel

✖


bhigh alloy’ steel

✖


cduralumin

✖


dTimken, Haste and Inconel allpys

✓



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