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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

Clearance volume in actual reciprocating compressors is essential __________________?
A to accommedate Valves in the cylinder head
B to provide cushioning effect
C to attain high volumetric efficiency
D to avoid mechanical bang of piston with cylinder head
Correct Answer: to provide cushioning effect
The net work input required for compressor with increase in clearance volume_____________________?
A increases
B decreases
C remains same
D increases/decreases depending on com-pressor capacity
Correct Answer: remains same
The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?
A compression index
B compression ratio
C compressor efficiency
D mean effective pressure
Correct Answer: mean effective pressure
Ratio of compression is the ratio of__________________?
A gauge discharge pressure to the gauge intake pressure
B absolute discharge pressure to the ab-solute intake pressure
C pressures at discharge and suction cor-responding to same temperature
D stroke volume and clearance volume
Correct Answer: absolute discharge pressure to the ab-solute intake pressure
Volumetric efficiency is_____________________?
A the ratio of stroke volume to clearance volume
B the ratio of the air actually delivered to the amount of piston displacement
C reciprocal of compression ratio
D index of compressor performance
Correct Answer: the ratio of the air actually delivered to the amount of piston displacement
Volumetric efficiency of a compressor without clearance volume________________?
A increases with increase in compression ratio
B decreases with increase in compression ratio
C is not dependent upon compressin ratio
D may increase/decrease depending on compressor capacity
Correct Answer: is not dependent upon compressin ratio
Volumetric efficiency of air compressors is of the order of________________?
A 20-30%
B 40-50%
C 60-70%
D 70-90%
Correct Answer: 70-90%
Cylinder clearance in a compressor should be _________________?
A as large as possible
B as small as possible
C about 50% of swept volume
D about 100% of swept volume
Correct Answer: as small as possible
Ratio of indicated H.P. and brake H.P. is known as_________________?
A mechanical efficiency
B volumetric efficiency
C isothermal efficiency
D adiabatic efficiency
Correct Answer: mechanical efficiency
Aeroplanes employ following type of compressor_______________?
A radial flow
B axial flow
C centrifugal
D combination of above
Correct Answer: axial flow
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