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
E. isobaric
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
The following property is most important for material used for gas turbine blade :
A. toughness
B. fatigue
C. creep
D. corrosion resistance
Fighter bombers use following type of engine :
A. turbo-jet
B. turbo-propeller
C. rocket
D. ram-jet ,
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. uncompilable
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 pressure energy
C. provide robust structure
D. beautify the shape
The air entry velocity m a rocket as compared to aircraft is :
A. same
B. more
C. less
D. zero
Propulsion efficiency of the following order-is obtained in practice :
A. 34%
B. 50%
C. 60%
D. 72%
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
