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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