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43.

In vapour compression cycle using NH3 as refrigerant, initial charge is filled at

A.	suction of compressor	B.	delivery of compressor
C.	high pressure side colse to receiver	D.	low pressure side near receiver

44.

In vapour compression cycle, the condition of refrigerant is saturated liquid

A.	after passing through the condenser	B.	before passing through the condenser
C.	after passing through the expansion throttle valve	D.	before entering the expansion valve

45.

One of the purposes of sub-cooling the liquid refrigerant is to

A.	reduce compressor overheating	B.	reduce compressor discharge tempera-ture
C.	increase cooling effect	D.	ensure that only liquid and not the vapour enters the expansion (throttling) valve

46.

One ton refrigeration corresponds to

A.	50 kcal/min	B.	50 kcal/kr
C.	80 kcal/min	D.	80 kcal/hr

47.

The boiling point of ammonia is

A.	-100°C	B.	-50°C
C.	- 33.3°C	D.	0°C

48.

The value of COP in vapour compression cycle is usually

A.	always less than unity	B.	always more than unity
C.	equal to unity	D.	any one of the above

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