GATE Objective Questions Refrigeration and Air Conditioning

Refrigeration and Air Conditioning : Objective Questions

1. A Bell-Coleman air refrigeration cycle works as a reversed –

A. Diesel Cycle

B. Otto Cycle

C. Brayton Cycle

D. Stirling Cycle

View Answer/Explanation

Correct Answer is C

Bell-Coleman air refrigeration cycle works as a reversed Brayton or Joule Cycle.

2. The most suitable pair of refrigerant and absorbent combination for solar refrigeration is –

A. Ammonia and Water

B. Ammonia and Sodium thiocyanide

C. Water and lithium bromide

D. R22 and dimethylformamide

View Answer/Explanation

Correct Answer is A

3. A refrigerator based on reversed Carnot cycle works between refrigeration and condenser temperature of -23 °C and 27 °C. If cooling rate of 5 kW is desired, what will be the required power in kW?

A. 1

B. 2.5

C. 25

D. 5

View Answer/Explanation

Correct Answer is A

4. Ammonia used as a refrigerant is non-corrosive to –

A. iron and steel

B. Copper and Copper alloys

C. Both (A) & (B)

D. None of these

View Answer/Explanation

Correct Answer is A

5. In a refrigeration plant, if the condenser temperature increases, then the power input to the compressor will –

A. increase

B. decrease

C. remains the same

D. Unpredictable

View Answer/Explanation

Correct Answer is A

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