A. jet velocity
B. twice the jet velocity
C. half the jet velocity
D. average of the jet velocity
E. no such co-relationship with jet velocity exists
Related Mcqs:
- The air entry velocity m a rocket as compared to aircraft is_________________?
A. same
B. more
C. less
D. zero
E. dependent on power and speed - The material commonly used for air craft gas turbine is__________________?
A. stainless steel
B. high alloy’ steel
C. duralumin
D. Timken, Haste and Inconel allpys
E. titanium - A gas turbine used in air craft should have______________________?
A. high h.p. and low weight
B. low weight and small frontal area
C. small frontal area and high h.p.
D. high speed and high h.p.
E. all of the above - If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?
A. Vi=V0B
B. Vt>V0
C. U,<V0
D. V,= U0
E. Vri=Vm - There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. remain same
B. decrease
C. increase
D. unpredictable
E. none of the above - The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?
A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness - A rocket engine for the combustion of its fuel_____________________?
A. carries its own oxygen
B. uses surrounding air
C. uses compressed atmospheric air
D. does not require oxygen
E. depends on electrical energy supplied by solar cells - Volumetric efficiency of air compressors is of the order of________________?
A. 20-30%
B. 40-50%
C. 60-70%
D. 70-90%
E. 90-100% - The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?
A. 550 km/hr
B. 1050km/hr
C. 1700 km/hr
D. 2400km /hr
E. 4000 km/hr - The work done per unit mass of air in compression will’be least when n is equal to______________?
A. 1
B. 1.2 ,
C. 1.3
D. 1.4
E. 1.5
