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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

Maximum work is done in compressing air when the compression is_________________?
A isothermal
B adiabatic
C polytropic
D any one of the above
Correct Answer: adiabatic
The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?
A standard air
B free air
C compressed air
D compressed air at delivery pressure
Correct Answer: free air
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
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