MCQs of Refrigerant and Refrigeration Cycles (Applied Thermodynamics - 3161910)

Showing 21 to 30 out of 65 Questions

21.

The designation of

N H_{3}

22.

The designation of

C O_{2}

23.

The designation of air is

24.

The designation of water is

25.

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

(a)	reduce compressor overheating
(b)	reduce compressor discharge temperature
(c)	increase cooling effect
(d)	ensure that only liquid and not the vapour enters the expansion (throttling) valve

26.

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

27.

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

28.

The COP of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

(a)	increase
(b)	decrease
(c)	may increase or decrease depending on the type of refrigerant used
(d)	remain unaffected

29.

In the vapour compression refrigeration system, the condition of refrigerant is saturated liquid

(a)	after passing through the condenser
(b)	before passing through the condenser
(c)	before entering the compressor
(d)	after passing through the expansion valve

30.

In vapour compression refrigeration system, the condition of refrigerant is very wet vapour

(a)	after passing through the condenser
(b)	before passing through the condenser
(c)	before entering the compressor
(d)	after passing through the expansion valve

Showing 21 to 30 out of 65 Questions