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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

Most of the domestic refrigerators work on the following refrigeration system _________________?
A vapour compression
B vapour absorption
C carnot cycle
D electrolux refrigerator
Correct Answer: vapour compression
The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
A increase
B decrease
C remain unaffected
D may increase or decrease depending on the type of refrigerant used
Correct Answer: increase
For obtaining high COP, the pressure range of compressor should be_______________?
A high
B low
C optimum
D any value
Correct Answer: low
Super heating in a refrigeration cycle __________________?
A increases COP
B decreases COP
C COP remains unaltered
D other factors decide COP
Correct Answer: decreases COP
Moisture in freon refrigeration system causes________________?
A ineffective refrigeration
B high power consumption
C freezing automatic regulating valve
D corrosion of whole system
Correct Answer: freezing automatic regulating valve
The leaks in a refrigeration system using Freon are detected by____________________?
A halide torch which on detection produces greenish flame lighting
B sulphur sticks which on detection gives white smoke
C using reagents
D smelling
Correct Answer: halide torch which on detection produces greenish flame lighting
In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?
A suction of compressor
B delivery of compressor
C high pressure side close to receiver
D low pressure side near receiver
Correct Answer: high pressure side close to receiver
Freon group of refrigerants are___________________?
A inflammable
B
C non-inflammable and toxic
D non-toxic and inflammable
Correct Answer: inflammable
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?
A condensation of the refrigerant vapour
B evaporation of the refrigerant liquid
C compression of the refrigerant vapour
D metering of the refrigerant liquid
Correct Answer: evaporation of the refrigerant liquid
In a refrigeration cycle, the flow of refrigerant is controlled by___________________?
A compressor
B condenser
C evaporator
D expansion valve
Correct Answer: expansion valve
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