The air entry velocity m a rocket as compared to aircraft is_________________?

Related Mcqs:

1. 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

2. A rocket works with maximum overall efficiency when air craft velocity is equal to the_________________?

   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

3. 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

4. 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

5. 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

6. Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?

   A. higher
   B. lower
   C. equal
   D. can’t be compared
   E. unpredictable

7. The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?

   A. more
   B. less
   C. same
   D. depends on other factors
   E. unpredictable

8. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

   A. less
   B. more
   C. same
   D. more/less depending on compressor capacity
   E. unpredictable

9. In the aircraft propellers __________________?

   A. the propulsive matter is caused to flow around the propelled body
   B. propulsive matter is ejected from within the propelled body
   C. its functioning does not depend on presence of air
   D. all of the above
   E. none of the above

10. Maximum work is done in compressing air when the compression is_________________?

    A. isothermal
    B. adiabatic
    C. polytropic
    D. any one of the above
    E. none of the above