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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

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
Correct Answer: convert kinetic energy of air into pres-sure energy
The air entry velocity m a rocket as compared to aircraft is_________________?
A same
B more
C less
D zero
Correct Answer: zero
Propulsion efficiency of the following order-is obtained in practice _______________?
A 34%
B 50%
C 60%
D 72%
Correct Answer: 60%
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
Correct Answer: 2400km /hr
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
Correct Answer: jet velocity
In the cross compounding of the gas turbine plant__________________?
A h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine
B h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine
C both the arrangements can be employed
D all are connected in series
Correct Answer: h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine
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
Correct Answer: 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
Correct Answer: carries its own 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
Correct Answer: kerosene
A jet engine works on the principle of conservation of____________________?
A mass
B energy
C flow
D linear momentum
Correct Answer: linear momentum
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