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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

The unit of energy in S.I. units is________________?
A watt
B joule
C joule/s
D joule/m
Correct Answer: joule
The unit of mass in S.I. units is ____________________?
A kilogram
B gram
C tonne
D quintal
Correct Answer: kilogram
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
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