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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 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
The main purpose of reheating in gas turbine is to__________________?
A increase temperature
B reduce turbine size
C increase power output
D increase speed
Correct Answer: increase power output
Work ratio of a gas turbine plant is ratio of______________________?
A net work output and work done by turbine
B net work output and heat supplied
C work done by turbine and heat supplied
D work done by turbine and net work output
Correct Answer: net work output and work done by turbine
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