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
Ans : (c)
Ans. (a)
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