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1.

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



2.

A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be                        
A. 0.2 B. 1.2
C. 5 D. 6



3.

Accumulators should have adequate volume to store refrigerant charge at least                        
A. 10% B. 25%
C. 50% D. 75%




4.

Aqua ammonia is used as refrigerant in the following type of refrigeration system                        
A. compression B. direct
C. indirect D. absorption



5.

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant                        
A. decreases B. increases
C. remains same D. depends on other factors



6.

Choose the correct statement                        
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



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