Mechanical Engineering MCQs

2075 MCQs  (Page 17 of 208)

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
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
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