Refrigeration & Air Conditioning MCQ Questions Mechanical Engineering

Refrigeration & Air Conditioning (AC) MCQ Questions Answers – Mechanical Engineering


1) COP of a carnot heat pump operating between -30C and 270C is

a) 10

b) 9

c) 0.111

d) 0.10

View Answer
Option – a)

2)Which is the primary refrigerant in central air conditioning plant
(a) Air
(b) Water
(c) Freon-22
(d) None
(Ans:c)

 

3) One tones of refrigeration is equal to

a) 210 kJ/min

b) 3.5 kJ/min

c) 105 KJ/min

d) 250 kJ/min

View Answer
Option – a)

 

4)Which is the secondary refrigerant in an ice plant
(i) Mercury
(j) Brine solution
(k) Freon-22
(l) None
(Ans:b)

 

5) Which is usually the costliest item in a refrigeration system ?

a) Condenser

b) Capillary tube

c) Compressor

d) Evaporator

View Answer
Option – c)

6)Latent heat is highest for
(a) Refrigerant – 22
(b) Ammonia
(c) Water
(d) None
(Ans:c)

 

7) An Electrolux refrigerator uses

a) one pump

b) two pump

c) no pump

d) three pump

View Answer
Option – c)

8)   The ideal gas-refrigeration cycle is similar to

 

Brayton cycle
b. Reversed Brayton cycle
c. Rankine cycle
d. Reversed Rankine cycle

ans – b

 

9) A carnot refrigerator has a COP of 6. What is the ratio of the lower to the higher absolute temperature

a) 1/6

b) 7/8

c) 6/7

d) 1/7

View Answer
Option – c)

10)For the same capacity of plant, the COP of the vapour absorption refrigeration system is

 

lower than the COP of the vapour compression refrigeration system
b. higher than the COP of the vapour compression refrigeration system
c. same as the COP of the vapour compression refrigeration system
d. cannot say

ans – a

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