Mechanical Engineering MCQs

Page No. 176

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


acollect more air


bconvert kinetic energy of air into pres-sure energy


cprovide robust structure


dbeautify the shape



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


asame


bmore


cless


dzero


View Answer zero

Propulsion efficiency of the following order-is obtained in practice _______________?


a34%


b50%


c60%


d72%


View Answer 60%

The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?


a550 km/hr


b1050km/hr


c1700 km/hr


d2400km /hr


View Answer 2400km /hr

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


ajet velocity


btwice the jet velocity


chalf the jet velocity


daverage of the jet velocity


View Answer half the jet velocity

In the cross compounding of the gas turbine plant__________________?


ah.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine


bh.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine


cboth the arrangements can be employed


dall are connected in series



Propulsive efficiency is defined as ratio of___________________?


athrust power and fuel energy


bengine output and propulsive power


cpropulsive power and fuel input


dthrust power and propulsive power



A rocket engine for the combustion of its fuel_____________________?


acarries its own oxygen


buses surrounding air


cuses compressed atmospheric air


ddoes not require oxygen



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


aliquid hydrogne


bhigh speed diesel oil


ckerosene


ddemethylated spirit


View Answer kerosene

A jet engine works on the principle of conservation of____________________?


amass


benergy


cflow


dlinear momentum


View Answer linear momentum

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