Refrigeration & Air-Conditioning MCQ Question with Answer

Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 8
The relative humidity lines on a psychrometric chart are

Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines

Question No : 9
Moisture in Freon refrigeration system causes

Ineffective refrigeration
High power consumption
Freezing automatic regulating valve
Corrosion of whole system

Question No : 10
Which of the following statement is correct?

The human body can lose heat even if its temperature is less than the atmospheric temperature.
The increase in air movement increases the evaporation from the human body.
The warm air increases the rate of radiation of heat from the human body.
Both (A) and (B)

Question No : 11
The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature)

[T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)]
[T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]
[T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)]
[T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)]

Question No : 12
The operating pressure for refrigerating units using R-12 as a refrigerant is

2 bar
8 bar
15 bar
30 bar

Question No : 13
The Freon group of refrigerants are

Halocarbon refrigerants
Zoetrope refrigerants
Inorganic refrigerants
Hydrocarbon refrigerants

Question No : 14
The coefficient of performance of Heat Pump is always __________ one.

Equal to
Less than
Greater than
None of these