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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

Fighter bombers use following type of engine __________________?
A turbo-jet
B turbo-propeller
C rocket
D ram-jet ,
Correct Answer: turbo-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 uncomparable
Correct Answer: lower
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
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