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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

An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?
A one adiabatic, two isobaric, and one constant volume
B two adiabatic and two isobaric
C two adiabatic, one isobaric and one constant volume,
D one adiabatic, one isobaric and two constant volume
Correct Answer: two adiabatic and two isobaric
The work done per unit mass of air in compression will’be least when n is equal to______________?
A 1
B 1.2 ,
C 1.3
D 1.4
Correct Answer: 1
An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?
A one adiabatic, two isobaric, and one constant volume
B two adiabatic and two isobaric
C two adiabatic, one isobaric and one constant volume
D one adiabatic, one isobaric and two constant volume
Correct Answer: one adiabatic, two isobaric, and one constant volume
What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt ?
A 3 m3/mt
B 1.5 m3/mt
C 18 m3/mt
D 6 m3/mt
Correct Answer: 3 m3/mt
Isothermal compression though most efficient, but is not -practicable because_________________?
A ityrequires very big cylinder
B it does not increase pressure much
C it is impossible in practice
D compressor has to run at very slow speed to achieve it
Correct Answer: compressor has to run at very slow speed to achieve it
Inter cooling in compressors__________________?
A cools the delivered air
B results in saving of power in compressing a given volume to given pressure
C is the standard practice for big compressors
D enables compression in two stages
Correct Answer: results in saving of power in compressing a given volume to given pressure
The compressor capacity with decrease in suction temperature_________________?
A increases
B decreases
C remains unaffected
D may increase or decrease depending on compressor capacity
Correct Answer: increases
Standard air is the air at_____________________?
A atmospheric conditions at any specific location
B 20°C and 1 kg/cm2 and relative humidity 36%
C 0°C and standard atmospheric conditions
D 15°C and 1 kg/cm2
Correct Answer: 20°C and 1 kg/cm2 and relative humidity 36%
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
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