Mechanical Engineering MCQs

Page No. 138

Which of the following is not a desirable property of a refrigerant_________________?


ahigh triiscibility with oil

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blow boiling point

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cgood electrical conductor

✓


dlarge latent heat

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Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?


astrong solution to weak solution

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bweak solution to strong solution

✓


cstrong solution to ammonia vapour

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dammonia vapour to weak solution

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If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?


asame

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bmore

✓


cless

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dmore/less depending on rating

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View Answer more

Highest pressure encountered in a refrigeration system should be________________?


acritical pressure of refrigerant

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bmuch below critical pressure

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cmuch above critical pressure

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dnear critical pressure

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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________________?


aAmmonia

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bCarbon dioxide

✓


cFreon

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dBrine

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View Answer Carbon dioxide

Where does the lowest temperature occur in a vapour compression cycle ?


acondenser

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bevaporator

✓


cexpansion valve

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dreceiver

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View 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___________________?


a1 : 1

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b1 : 9

✓


c9 : 1

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d1 : 3

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View Answer 1 : 9

Ammonia is __________________?


anon-toxic

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bnon-inflammable

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ctoxic and non-inflammable

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dhighly toxic and inflammable

✓



Short horizontal lines on pressure-enthalpy chart show__________________?


aconstant pressure lines

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bconstant temperature lines

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cconstant total heat lines

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dconstant entropy lines

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One ton of the refrigeration is_________________?


athe standard unit used in refrigeration problems

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bthe cooling effect produced by melting 1 ton of ice

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cthe refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

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dthe refrigeration effect to produce 1 ton of ice at NTP conditions

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