MCQ on Refrigeration and Airconditioning for JE Exam part 6
51. Pick up the correct statement–
(a) The refrigerant should have high thermal
conductivity and low freezing temperature
(b) The refrigerant should have low heat transfer
coefficient and high latent heat
(c) The refrigerant should have high specific
volume and high latent heat
(d) The refrigerant should have high specific
volume and low latent heat
Ans : (a
52. A refrigerant should have the following property–
(a) High boiling point
(b) High latent heat
(c) High specific heat
(d) High specific volume
Ans : (b)
53. Which of the following cycles uses air as the
refrigerant ?
(a) Ericsson
(b) Stirling
(c) Carnot
(d) Bell-Coleman
Ans : (d)
54. in a domestic refrigerator is carried out in
(a) evaporator
(b) capillary tube
(c) expansion valve
(d) condenser
Ans : (b)
55. Which is not true in respect of an ideal
refrigerant?
(a) high latent heat of vapourisation and specific
(b) critical pressure and temperature well above
the maximum operating pressure and
temperature limits
(c) low value of specific volume
(d) high value of thermal conductivity
Ans : (a)
56. During a refrigeration cycle heat is rejected by
the refrigerant in a :
(a) Compressor
(b) Condenser
(c) Evaporator
(d) Expansion valve
Ans : (b)
57. The bank of tubes at the back of a domestic
refrigerator are :
(a) Condenser tubes
(b) Evaporator tubes
(c) Refrigerant cooling tube
(d) Capillary tubes
Ans : (a)
58. One ton of refrigerator is equal to the
refrigeration effect corresponding to melting of
1000 kg ice :
| (a) In 1 hour/ | (b) In 1 minute |
| (c) In 24 hours | (d) in 12 hours 12 |
Ans : (c)
59. Presence of moisture in a refrigerant affects the
working of :
(a) Compressor
(b) Condenser
(c) Evaporator
(d) Expansion valve
Ans : (d)
60. The food compartment of a refrigerator is
maintained at 4oC by removing heat from it at a
rate of 360 kJ/min. If the required power input
to the refrigerator is 2kW, the COP of the
refrigerator is
(a) 2.0 (b) 1/3
(c) 0.5 (d) 3.0
| Ans : (d) |