Propulsive efficiency is defined as ratio of___________________?

A. Thrust power and fuel energy
B. Engine output and propulsive power
C. Propulsive power and fuel input
D. Thrust power and propulsive power

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

Which of the following fuels can be used in turbojet engines _____________________?

A. Liquid hydrogne
B. High speed diesel oil
C. Kerosene
D. Demethylated spirit

A jet engine works on the principle of conservation of____________________?

A. Mass
B. Energy
C. Flow
D. Linear momentum

Ram compression in turbojet involves____________________?

A. Reduction of speed of incoming air and conversion of part of it into pressure energy
B. Compression of inlet air
C. Increasing speed of incoming air
D. Lost work

The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?

A. Less
B. More
C. Same
D. May be less or more depending on ambient conditons

Intercooling in gas turbine results in ____________________ ?

A. Increase in net output but decrease in thermal efficiency
B. Increase in thermal efficiency but decrease in net output
C. Increase in both thermal efficiency and net output
D. Decrease in both thermal efficiency and net output

If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?

A. Isothermal
B. Isentropic
C. Adiabatic
D. Isochoric

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

Turbo propeller has the following additional feature over the turbojet __________________?

A. Peopeller
B. Diffuser
C. Intercooler
D. Turbine and combustion chamber