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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 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
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?
A more
B less
C equally.
D unpredictable
Correct Answer: more
Which of the following refrigerants has lowest freezing point_______________?
A Freon-12
B NH3
C C02
D Freon-22
Correct Answer: Freon-22
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?
A same
B more
C less
D more or less depending on ambient conditions
Correct Answer: less
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