Refrigeration Questions and Answers – Coefficient of Performance of Ideal VAR System – 1

This set of Refrigeration Multiple Choice Questions & Answers (MCQs) focuses on “Coefficient of Performance of Ideal VAR System – 1”.

1. What is the formula for COP of an ideal vapour absorption refrigeration system?
Q_g = the heat given to the refrigerant in the generator
Q_e= the heat absorbed by the refrigerant in the evaporator
a) \(\frac{Q_e}{Q_g}\)
b) \(\frac{Q_g}{Q_e}\)
c) Q_g × Q_e
d) Q_g – Q_e
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2. An ideal vapour absorption refrigeration system may be regarded as a combination of _________
a) Carnot engine and Carnot pump
b) Carnot refrigerant and Carnot pump
c) Carnot engine and Carnot refrigerant
d) Carnot engine alone
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3. Find the COP of a vapour absorption refrigeration system using the following data.
Q_g = 6600
Q_e = 2100
a) 0.45
b) 0.65
c) 0.31
d) 0.35
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4. Find the COP of a vapour absorption refrigeration system using the following data.
T_e = 268
T_g = 393.2
T_c = 303
a) 1.53
b) 1.76
c) 1.66
d) 1.98
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5. The expression \(\frac{T_e}{T_c – T_e}\) in the formula for COP i.e. \(\frac{T_e}{T_c – T_e} × \frac{T_g-T_c}{T_g}\) refers to __________
T_e and T_c are the temperature limits for Carnot refrigerator
T_g and T_c are the temperature limits for Carnot engine
a) COP of Carnot engine
b) COP of Carnot refrigerator
c) COP of Carnot pump
d) COP of Bell-Coleman cycle
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6. In case the heat is discharged at different temperatures in condenser and absorber then the formula for COP would be?
T_a = Temperature at which heat is discharged in the absorber
T_e and T_c are the temperature limits for Carnot refrigerator
T_g and T_c are the temperature limits for Carnot engine
a) COP = \(\frac{T_e}{T_c – T_e} × \frac{T_g-T_c}{T_g}\)
b) COP = \(\frac{T_e}{T_c – T_e} × \frac{T_g-T_c}{T_g} × T_a\)
c) COP = \(\frac{T_e}{T_c – T_e} × \frac{T_g-T_c}{T_g} ± T_a\)
d) COP = \(\frac{T_e}{T_c – T_e} × \frac{T_g-T_c}{T_g}\)
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7. Find the COP of an ideal vapour absorption refrigeration system using the following data.
Q_g = 1880
Q_e = 1045
a) 0.47
b) 0.65
c) 0.69
d) 0.55
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