Engineering Thermodynamics (3131905) MCQs

MCQs of Refrigeration Cycles

Showing 11 to 20 out of 39 Questions
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11.

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 use
(d)

remain unaffected
Answer:

Option (a)

12.

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 these
Answer:

Option (d)

13.

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
Answer:

Option (d)

14.

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
Answer:

Option (b)

15.

For obtaining high COP, the pressure range of compressor should be

(a)

high
(b)

low
(c)

optimum
(d)

depends on capacity
Answer:

Option (b)

16.

The effect of superheating of vapour after exit evaporator in VCR system is

(a)

increase in power consumption of compressor
(b)

increase in refrigerating effect
(c)

increase in heat rejection to the condenser
(d)

all of these
Answer:

Option (d)

17.

The sequence of main components in vapour compression refrigeration system is

(a)

compressor, condenser, expansion valve, evaporator
(b)

compressor, condenser, evaporator, expansion valve
(c)

compressor, evaporator, condenser, expansion valve
(d)

all of these
Answer:

Option (a)

18.

In vapour compression refrigeration system, the condition of refrigerant after compression is

(a)

high pressure, high temperature vapour refrigerant
(b)

high pressure, high temperature liquid  refrigerant
(c)

low pressure, low temperature liquid refrigerant
(d)

low pressure, low temperature vapour refrigerant 
Answer:

Option (c)

19.

In a refrigeration system, heat absorbed by the refrigerant to cool the space in 

(a)

compressor
(b)

evaporator
(c)

condenser
(d)

capillary tube
Answer:

Option (b)

20.

In a refrigeration cycle, the enthalpy remains constant during

(a)

compression
(b)

expansion
(c)

condenstaion
(d)

evaporation
Answer:

Option (b)

Showing 11 to 20 out of 39 Questions
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