Fluid Mechanics & Thermal Sciences-Refrigeration and Air Conditioning [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering (ME)]: Questions 1 - 4 of 140

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Question 1

Question MCQ▾

A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Choices

Choice (4)Response

a.

Automatic expansion valve

b.

High side float valve

c.

Low side float valve

d.

Thermostatic expansion valve

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Question 2

Question MCQ▾

In a cooling tower, the minimum temperature to which water can be cooled is equal to the

Choices

Choice (4)Response

a.

Dew point temperature of the air at the inlet

b.

Dry bulb temperature of the air at the inlet

c.

Mean of the dew point and dry bulb temperature of the air at the inlet

d.

Thermodynamic wet bulb temperature of the air at the inlet

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Question 3

Question Assertion-Reason▾

Assertion(Ꭺ)

If a domestic refrigerator works inside an adiabatic room with its door open, the room temperature gradually decreases.

Reason(Ꭱ)

Vapour compression refrigeration cycles have high COP compared to air refrigeration cycles.

Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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Question 4

Question MCQ▾

The effects of superheating of vapour in the evaporator and sub cooling of condensate in the condenser, for the same compressor work?

Choices

Choice (4)Response

a.

Increase the COP

b.

Decrease the COP

c.

Superheating increases COP, but sub cooling decreases COP

d.

Superheating decreases COP, but sub cooling increases COP

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