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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