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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

Pick up the incorrect statement?
A lithium bromide used in vapour absorption cycle is nonvolatile
B lithium bromide plant can’t operate below 0°C
C a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
D concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator
Correct Answer: a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
Choose the wrong statement ?
A Temperature of medium being cooled must be below that of the evaporator
B Refrigerant leaves the condenser as liquid
C All solar thermally operated absorption systems are capable only of intermittent operation
D frost on evaporator reduces heat transfer
Correct Answer: Temperature of medium being cooled must be below that of the evaporator
Choose the correct statement?
A A refrigerant should have low latent heat
B If operating temperature of system is low, then refrigerant with low boiling point should be used
C Precooling and subcooling bf refrigerant are same
D Superheat and sensible heat of a. refrigerant are same
Correct Answer: If operating temperature of system is low, then refrigerant with low boiling point should be used
In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?
A liquid
B sub-cooled liquid
C saturated liquid
D wet vapour
Correct Answer: wet vapour
Highest temperature encountered in refrigeration cycle should be________________?
A near critical temperature of refrigerant
B above critical temperature
C at critica. temperature
D much below critical temperature
Correct Answer: much below critical temperature
One of the purposes of sub-cooling the liquid refrigerant is to________________?
A reduce compressor overheating
B reduce compressor discharge temperature
C increase cooling effect
D ensure that only liquid and not the vapour enters the expansion (throttling) valve
Correct Answer: ensure that only liquid and not the vapour enters the expansion (throttling) valve
In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?
A more
B less
C same
D more for small capacity and less for high capacity
Correct Answer: less
Formation of frost on evaporator in refrigerator ________________?
A results in loss of heat due to poor heat transfer
B increases heat transfer rate
C is immaterial
D can be avoided by proper design
Correct Answer: results in loss of heat due to poor heat transfer
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?
A decreases
B increases
C remains same
D depends on other factors
Correct Answer: increases
Which of the following is not a desirable property of a refrigerant_________________?
A high triiscibility with oil
B low boiling point
C good electrical conductor
D large latent heat
Correct Answer: good electrical conductor
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