Mechanical Engineering MCQs

Page No. 177

Ram compression in turbojet involves____________________?


areduction of speed of incoming air and conversion of part of it into pressure energy


bcompression of inlet air


cincreasing speed of incoming air


dlost work



The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?


aless


bmore


csame


dmay be less or more depending on ambient conditons


View Answer less

Intercooling in gas turbine results in ____________________ ?


aincrease in net output but decrease in thermal efficiency


bincrease in thermal efficiency but decrease in net output


cincrease in both thermal efficiency and net output


ddecrease in both thermal efficiency and net output



If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?


aisothermal


bisentropic


cadiabatic


disochoric


View Answer isothermal

In jet engines, paraffin is usually used as the fuel because of its _________________?


ahigh calorific value


bease of atomisation


clow freezing point


dA. and C. above


View Answer A. and C. above

Turbo propeller has the following additional feature over the turbojet __________________?


apeopeller


bdiffuser


cintercooler


dturbine and combustion chamber


View Answer peopeller

In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?


avacuum


batmospheric air


ccompressed air


doxygen alone


View Answer compressed air

In gas turbines^ high thermal efficiency is obtained in_________________?


aclosed cycle


bopen cycle


cboth of the above


dclosed/open depending on other con-siderations


View Answer closed cycle

A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?


ahigh pressure ratio


bincreasing gas temperature


chigh specific volume


dpaucity of 02


View Answer paucity of 02

In the axial flow gas turbine, the work ratio is the ratio of____________________?


acompressor work and turbine work


boutput and input


cactual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet


dactual compressor work and theoretical comprssor work



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