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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

Reciprocating air compressor is best suited for___________________?
A large quantity of air at high pressure
B small quantity of air at high pressure
C small quantity of air at low pressure
D large quantity of air at low pressure
Correct Answer: large quantity of air at high pressure
After-cooler is used to__________________?
A cool the air
B decrease the delivery temperature for ease in handling
C cause moisture and oil vapour to drop out
D reduce volume
Correct Answer: cause moisture and oil vapour to drop out
Rotary compressor is best suited for_____________________?
A large quantity of air at high pressure
B small quantity of air at high pressure
C small quantity of air at low pressure
D large quantity of air at low pressure
Correct Answer: small quantity of air at high pressure
Which is false statement about air receivers ___________________?
A These are used to dampen pulsations ,
B These act as reservoir to- take care of sudden demands
C These increase compressor efficiency
D These knock out some oil and moisture
Correct Answer: These increase compressor efficiency
The clearance volume of the air compressor is kept minimum because____________________?
A it allows maximum compression to be achieved
B it greatly affects volumetric efficiency
C it results in minimum work
D it permits isothermal compression
Correct Answer: it greatly affects volumetric efficiency
Ratio of indicated h.p. to shaft h.p. in known as__________________?
A compressor efficiency
B isothermal efficiency
C volumetric efficiency
D mechanical efficiency
Correct Answer: mechanical efficiency
Euler’s equation is applicable for__________________?
A centrifugal compressor
B axial compressor
C pumps
D all of the above
Correct Answer: all of the above
Which is false statement about multistage compression ?
A Power consumption per unit of air delivered is low
B Volumetric efficiency is high
C It is best suited for compression ratios around 7:1
D The moisture in air is condensed in the intercooler
Correct Answer: Volumetric efficiency is high
Out of the following, from where you will prefer to take intake for air compressor_________________?
A from an air conditioned room maintained at 20°C
B from outside atmosphere at 1°C
C from coal yard side
D from a side where cooling tower is located nearby
Correct Answer: from a side where cooling tower is located nearby
Volumetric efficiency of a compressor with clearance volume ________________?
A increases with increase in compression ratio
B decreases with increase in compression ratio
C in not dependent upon compression ratio
D may increase/decrease depending on compressor capacity
Correct Answer: decreases with increase in compression ratio
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