A. 10: 1
B. 15: 1
C. 20 : 1
D. 60 : 1
E. 100 :
Related Mcqs:
- 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
E. none of the above - In air breathing jet engine, the jet is formed by expanding__________________?
A. gases
B. solids
C. liquid
D. plasma
E. highly heated atmospheric air - In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?
A. vacuum
B. atmospheric air
C. compressed air
D. oxygen alone
E. liquid hydrogen - The compression ratio in a jet engine varies proportional to ____________________?
A. speed
B. speed
C. altitude
D. Vspeed
E. does not Vary - The air-fuel ratio in gas turbines is of the order of ______________________?
A. 7 : 1
B. 15 : 1
C. 30 : 1
D. 40 : 1
E. 50: 1 - A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?
A. high pressure ratio
B. increasing gas temperature
C. high specific volume
D. high friction losses
E. paucity of 02 - A jet engine works on the principle of conservation of____________________?
A. mass
B. energy
C. flow
D. linear momentum
E. angular momentum - 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
E. lower at low 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
E. none of the above - In jet engines, paraffin is usually used as the fuel because of its _________________?
A. high calorific value
B. ease of atomisation
C. low freezing point
D. A. and C. above
E. none of the above
