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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

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
A Ammonia
B Carbon dioxide
C Freon
D Brine
Correct Answer: Carbon dioxide
Where does the lowest temperature occur in a vapour compression cycle ?
A condenser
B evaporator
C compressor
D expansion valve
Correct Answer: evaporator
Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?
A 1 : 1
B 1 : 9
C 9 : 1
D 1 : 3
Correct Answer: 1 : 9
Ammonia is __________________?
A non-toxic
B non-inflammable
C toxic and non-inflammable
D highly toxic and inflammable
Correct Answer: highly toxic and inflammable
Short horizontal lines on pressure-enthalpy chart show__________________?
A constant pressure lines
B constant temperature lines
C constant total heat lines
D constant entropy lines
Correct Answer: constant pressure lines
One ton of the refrigeration is_________________?
A the standard unit used in refrigeration problems
B the cooling effect produced by melting 1 ton of ice
C the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
D the refrigeration effect to produce 1 ton of ice at NTP conditions
Correct Answer: the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?
A bigger cabinet should be used
B smaller cabinet should be used
C perfectly tight vapour seal should be used
D refrigerant with lower evaporation temperature should be used
Correct Answer: perfectly tight vapour seal should be used
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
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