MCQ on Refrigeration and Air Conditioning
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1. The relationship between the coefficient of performance of refrigerator (COP)R and coefficient of performance of heat pump (COP)HP is given as : (a) [COP]R = 2[COP]HP (b) [COP]HP = [COP]R (c) [COP]R = [COP]HP –1 (d) [COP]R = [COP]HP + 1 |
Ans : (c) |
2. A 10 tonne refrigeration system consumes 10kW of electrical energy. It's Coefficient of Performance will be : (a) 10 (b) 3.5 (c) 0.35 (d) 35 |
Ans. (b) |
Qe = 10 tonne = 10 × 3.5 = 35 kJ/s W = 10 kW Qe = 35 |
COP = 3.5
3. The refrigerant used in reversed Brayton or Bell-coleman cycle is............ |
(c) Ammonia (d) Water
Ans. (a) |
4. The COP for Carnot refrigerator..............that of Carnot heat pump |
(a) equal to
(b) more than
(c) lesser than
(d) None of the other options
Ans : (c) |
5. Normally, the following condenser is used in
big refrigeration system of air conditioning
plants
(a) Double tube condenser
(b) Shell and tube condenser
(c) Shell and coil condenser
(d) Evaporative condenser
Ans : (c) |
6. Find the wrong among the following properties
of ideal refrigerant
(a) Low boiling point
(b) Low freezing point
(c) Low Latent Heat
(d) Good chemical stability