Mechanical Engineering MCQs

Page No. 173

The compression ratio in a gas turbine is of the roder of____________________?


a3.5 : 1


b5 : 1


c8 : 1


d12 : 1


View Answer 8 : 1

Ram-jet engine__________________?


ais self-operating at zero flight speed


bis not self-operating at zero^flight speed


crequires no air for its operation


dproduces a jet consisting of plasma



A simple turbo-jet engine is basically_________________?


aa propeller system


bgas-turbine engine equipped with a propulsive nozzle and diffuse*


cchemical rocket regine


dram-jet enigne



In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?


aless


bmore


csame


dmay be less or more depening upon speed


View Answer less

Pressure ratio in gas turbines is the ratio of ____________________?


acompressor pressure ratio


bhighest pressure to exhaust pressure


cinlet pressure to exhaust pressure


dpressures across the turbine



Which of the following plants is smallest and lightest for genrating a given amount of power__________________?


asteam power plant


bpetrol engine


cdiesel engine’


dgas turbine plant


View Answer gas turbine plant

Turbofan engine employs ____________________ ?


aone air stream


btwo or more air streams


cno air stream


dsolid fuel firing



The efficiency and work ratio of a gas turbine plant can be increased by _____________________?


ausing mulit-stage compressor with mfercooler


badding heat exchanger


cinjecting water in/around combustion chamber


dall of the above


View Answer all of the above

The compression ratio in a jet engine varies proportional to ____________________?


aaltitude


bspeed


cVspeed


ddoes not Vary


View Answer speed

For speed above 3000 km/hour, it is more advantageous to use____________________?


aturbo-jet engine


bram-jet engine


cpropellers


drockets


View Answer ram-jet engine

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