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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

Ram-jet engine__________________?
A is self-operating at zero flight speed
B is not self-operating at zero^flight speed
C requires no air for its operation
D produces a jet consisting of plasma
Correct Answer: is not self-operating at zero^flight speed
A simple turbo-jet engine is basically_________________?
A a propeller system
B gas-turbine engine equipped with a propulsive nozzle and diffuse*
C chemical rocket regine
D ram-jet enigne
Correct Answer: gas-turbine engine equipped with a propulsive nozzle and diffuse*
In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?
A less
B more
C same
D may be less or more depening upon speed
Correct Answer: less
Pressure ratio in gas turbines is the ratio of ____________________?
A compressor pressure ratio
B highest pressure to exhaust pressure
C inlet pressure to exhaust pressure
D pressures across the turbine
Correct Answer: highest pressure to exhaust pressure
Turbofan engine employs ____________________ ?
A one air stream
B two or more air streams
C no air stream
D solid fuel firing
Correct Answer: two or more air streams
The compression ratio in a jet engine varies proportional to ____________________?
A speed
B speed
C altitude
D Vspeed
Correct Answer: speed
For speed above 3000 km/hour, it is more advantageous to use____________________?
A turbo-jet engine
B ram-jet engine
C propellers
D rockets
Correct Answer: ram-jet engine
The efficiency of jet engine is__________________?
A higher at ground
B higher at high altitudes
C same at all altitudes
D higher at high speed
Correct Answer: higher at high altitudes
Reheating in multistage expansion gas turbine results in____________________?
A high thermal efficiency
B reduction in compressor work
C decrease of heat loss in exhaust
D maximum work output
Correct Answer: maximum work output
Gas turbine cycle with Regenerator __________________?
A increases thermal efficiency
B allows high compression ratio
C decreases heat loss is exhaust
D allows operation at very high altitudes
Correct Answer: increases thermal efficiency
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