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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

Free air is the air at________________?
A atmospheric conditions at any specific location
B 20°C and 1 kg/cm2 and relative humidity of 36%
C 0°C and standard atmospheric conditions
D 15°C and 1 kg/cm2
Correct Answer: atmospheric conditions at any specific location
1 m of air at atmospheric condition weighs approximately__________________?
A 0.5 kg
B 1.0 kg
C 1.3 kg
D 2.2 kg
Correct Answer: 1.3 kg
The overall isothermal eiffciency of compressor is defined as the ratio of_______________?
A isothermal h.p. to the BHP of motor
B isothermal h.p. to adiabatic h.p.
C power to drive compressor to isothermal h.p.
D work to compress air isothermally to work for actual compression
Correct Answer: isothermal h.p. to the BHP of motor
Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?
A multi-stage compression
B cold water spray
C both A. and B. above
D fully insulating the cylinder
Correct Answer: both A. and B. above
Isothermal compression effeicency can be attained by running the compressor__________________?
A at very high speed
B at very slow speed
C at average speed
D at zero speed
Correct Answer: at very slow speed
The- most efficient method of compressing air is to compress it_________________?
A isothermally
B adiabatically
C isentropically
D isochronically
Correct Answer: isothermally
Adiabatic compression is one in which___________________?
A temperature during compression remains constant
B no heat leaves or enters the compressor cylinder during cornpression
C temperature rise follows a linear relationship
D work done is maximum
Correct Answer: no heat leaves or enters the compressor cylinder during cornpression
Pick up the wrong statement ?
A centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities
B Axial flow compressors have a sub-stantially constant delivery at variable pressures
C centrifugal compressors have a wider stable operating range than axial flow compressors
D axial flow compressors are bigger in diameter compared to centrifugal type
Correct Answer: axial flow compressors are bigger in diameter compared to centrifugal type
Pick up the correct statement ?
A gas turbine uses low air-fuel ratio to economise on fuel
B gas turhine uses high air-fuel ratio to reduce outgoing temperature
C gas turbine uses low air-fuel ratio to develop the high thrust required
D all of the above
Correct Answer: gas turhine uses high air-fuel ratio to reduce outgoing temperature
Pick up the wrong statement ?
A large gas turbines employ axial flow compressors
B axial flow compressors are more stable than centrifugal type compressors but not as efficient
C axial flow compressors have high capacity and efficiency
D axial flow compressors have instability region of operation
Correct Answer: axial flow compressors are more stable than centrifugal type compressors but not as efficient
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