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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 advantage of dry compression is that________________?
A it permits higher speeds to be used
B it permits complete evaporation in the evaporator
C it results in high volumetirc and mechanical efficiency
D all of the above
Correct Answer: all of the above
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?
A bigger
B smaller
C equal
D smaller/bigger depending on capacity
Correct Answer: bigger
Under-cooling in a refrigeration cycle_________________?
A increases COP
B decreases COF
C COP remains unaltered
D other factors decide COP
Correct Answer: increases COP
The coefficient of performance is the ratio of the refrigerant effect to the_________________?
A heat of compression
B work done by compressor
C enthalpy increase in compressor
D all of the above
Correct Answer: all of the above
Vertical lines on pressure-enthalpy chart show constant_______________?
A pressure lines
B temperature lines
C total heat lines
D entropy lines
Correct Answer: total heat lines
The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?
A 0.1 to 0.5 h.p. per ton of refrigeration
B 0.5 to 0.8 h.p. per ton of refrigeration
C 1 to 2 h.p. per ton of refrigeration
D 2 to 5 h.p. per ton of refrigeration
Correct Answer: 1 to 2 h.p. per ton of refrigeration
Cooling water is required for following equipment in ammonia absorption plant__________________?
A condenser
B evaporator
C absorber
D condenser and absorber
Correct Answer: condenser
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will__________________?
A increase
B decrease
C may increase or decrease depending on the type of refrigerant used
D remain unaffected
Correct Answer: increase
The evolution of heat of solution takes place in ammonia absorption plant when _____________________?
A ammonia vapour goes into solution
B ammonia vapour is driven out of solution
C lithium bromide mixes with ammonia
D weak solution mixes with strong solution
Correct Answer: ammonia vapour goes into solution
The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?
A more
B less
C same
D more/less depending on size of plant
Correct Answer: more
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