Mechanical Engineering Mcqs
The efficiency of jet engine is__________________?

A. Higher at ground
B. Higher at high altitudes
C. Same at all altitudes
D. Higher at high speed

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

A. Turbo-jet engine
B. Ram-jet engine
C. Propellers
D. Rockets

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

A. using mulit-stage compressor with mfercooler
B. adding heat exchanger
C. injecting water in/around combustion chamber
D. reheating the air after partial expansion in the turbine

Turbofan engine employs ____________________ ?

A. One air stream
B. Two or more air streams
C. No air stream
D. Solid fuel firing

Pressure ratio in gas turbines is the ratio of ____________________?

A. Compressor pressure ratio
B. Highest pressure to exhaust pressure
C. Inlet pressure to exhaust pressure
D. Pressures across the turbine

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

A. Less
B. More
C. Same
D. May be less or more depening upon speed

A simple turbo-jet engine is basically_________________?

A. A propeller system
B. Gas-turbine engine equipped with a propulsive nozzle and diffuse*
C. Chemical rocket regine
D. Ram-jet enigne