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19.

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

20.

rick 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

21.

Super heating in a refrigeration cycle

A.	increases COP	B.	decreases COP
C.	COP remains unaltered	D.	other factors decide COP

22.

The advantage of dry compression is that

A.	it permits higher speeds to be used	B.	it permits complete evaporation in the evaporator
C.	it results in high volumetric and mechanical efficiency	D.	all of the above

23.

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will

A.	increase	B.	decrease
C.	remain unaffected	D.	may increase or decrease depending on the type of refrigerant used

24.

The coefficient of performance is the ratio of the refrigerant effect to the

A.	heat of compression	B.	work done by compressor
C.	enthalpy increase in compressor	D.	all of the above

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