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

A. Same
B. More
C. Less
D. Zero

In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?

A. Collect more air
B. Convert kinetic energy of air into pres-sure energy
C. Provide robust structure
D. Beautify the shape

The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?

A. Same
B. Higher
C. Lower
D. Uncomparable

The blades of gas turbine are made of_________________?

A. mild steel
B. stainless steel
C. carbon steel
D. high alloy seel

Fighter bombers use following type of engine __________________?

A. Turbo-jet
B. Turbo-propeller
C. Rocket
D. Ram-jet ,

The following property is most important for material used for gas turbine blade___________________?

A. Toughness
B. Fatigue
C. Creep
D. Corrosion resistance

The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?

A. Increase first at fast rate and then slow
B. Increase first at slow rate and then fast
C. Decrease continuously
D. First increase, reach maximum and then decrease

The effective power of gas turbines is increased by adding the following in compressor__________________?

A. Ammonia and water vapour
B. Carbon dioxide
C. Nitrogen
D. Hydrogen

Air-fuel ratio in a jet engine will be of the order of__________________?

A. 10: 1
B. 15: 1
C. 20 : 1
D. 60 : 1

In jet engines the compression ratio__________________?

A. Varies as square root of the speed
B. Varies linearly to the speed
C. Varies as square of the speed
D. Varies as cube of the speed