A. A refrigerant should have low latent heat
B. If operating temperature of system is low, then refrigerant with low boiling point should be used
C. Precooling and subcooling bf refrigerant are same
D. Superheat and sensible heat of a. refrigerant are same
E. Refrigerant is inside the lubes in case of a direct-expansion chiller
Related Mcqs:
- Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
A. strong solution to weak solution
B. weak solution to strong solution
C. strong solution to ammonia vapour
D. ammonia vapour to weak solution
E. ammonia vapour to strong solution - Choose the wrong statement ?
A. Temperature of medium being cooled must be below that of the evaporator
B. Refrigerant leaves the condenser as liquid
C. All solar thermally operated absorption systems are capable only of intermittent operation
D. frost on evaporator reduces heat transfer
E. refrigerant is circulated in a refrigeration system to transfer heat - Pick up the incorrect statement?
A. lithium bromide used in vapour absorption cycle is nonvolatile
B. lithium bromide plant can’t operate below 0°C
C. a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
D. concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator
E. weak solution in liquid heat exchanger gives up heat to the strong solution - The moisture in a refrigerant is removed by___________________?
A. evaporator
B. safety relief valve
C. dehumidifier
D. driers
E. expansion valve - Ammonia-absorption refrigeration cycle requires__________________?
A. very little work input
B. maximum work input
C. nearly same work input as for vapour compression cycle
D. zero work input
E. none of the above - Air refrigeration operates on_____________________?
A. Carnot cycle
B. Reversed Carnot cycle
C. Rankine cycle
D. Erricson cycle
E. Brayton cycle - The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?
A. condensation of the refrigerant vapour
B. evaporation of the refrigerant liquid
C. compression of the refrigerant vapour
D. metering of the refrigerant liquid
E. none of the above - 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
E. none of the above - Ammonia is __________________?
A. non-toxic
B. non-inflammable
C. toxic and non-inflammable
D. highly toxic and inflammable
E. none of the above - 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
E. Hydrocarbon refrigerant
