Mechanical Engineering MCQs

Page No. 138

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


ahigh triiscibility with oil


blow boiling point


cgood electrical conductor


dlarge latent heat



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


astrong solution to weak solution


bweak solution to strong solution


cstrong solution to ammonia vapour


dammonia vapour to weak solution



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


asame


bmore


cless


dmore/less depending on rating


View Answer more

Highest pressure encountered in a refrigeration system should be________________?


acritical pressure of refrigerant


bmuch below critical pressure


cmuch above critical pressure


dnear critical pressure



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


bCarbon dioxide


cFreon


dBrine


View Answer Carbon dioxide

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


acondenser


bevaporator


cexpansion valve


dreceiver


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


b1 : 9


c9 : 1


d1 : 3


View Answer 1 : 9

Ammonia is __________________?


anon-toxic


bnon-inflammable


ctoxic and non-inflammable


dhighly toxic and inflammable



Short horizontal lines on pressure-enthalpy chart show__________________?


aconstant pressure lines


bconstant temperature lines


cconstant total heat lines


dconstant entropy lines



One ton of the refrigeration is_________________?


athe standard unit used in refrigeration problems


bthe cooling effect produced by melting 1 ton of ice


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


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



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