What is the fundamental equation of the C.O.P. of Ideal VAR system?
a) Heat absorbed in the evaporator / Work done by a pump
b) Heat absorbed in the evaporator / Heat supplied in the generator
c) Heat absorbed in the evaporator / Work done by compressor + Heat supplied in the generator
d) Heat absorbed in the evaporator / Work done by pump + Heat supplied in the generator
Q.2.
What is the relation between QC, QG, and QE if they represent heat given to the refrigerant in the generator, heat discharging to atmosphere from condenser to absorber and heat absorbed by the refrigerant in the evaporator?
a) QC + QG = QE
b) QC = QG + QE
c) QC + QE = QG
d) QC = QG – QE
Q.3.
What is the equation of VAR system in terms of entropy?
a) QC + QE / TC = QG / TG + QE / TE
b) QG + QC / TC = QG / TG + QE / TE
c) QG + QE / TC = QG / TG + QE / TE
d) QG + QE / TC = QC / TC + QE / TE
Q.4.
What is the ratio of QG / QE in terms of temperature?
a) [TC – TE / TE] [TG / TG – TC]
b) [TC – TE / TE] [TG / TG – TE]
c) [TC – TE / TE] [TC / TG – TC]
d) [TC – TE / TC] [TG / TG – TC]
Q.5.
What is the value of maximum C.O.P. in terms of heat?
a) QG / QE
b) QE / QG
c) QG / QC
d) QC / QE
Q.6.
What is the value of maximum C.O.P. in terms of temperature?
a) [TC – TE / TE] [TG / TG – TC]
b) [TC – TE / TE] [TG / TG – TC]
c) [TC – TE / TE] [TG / TG – TC]
d) [TG – TC / TG] [TE / TC – TE]
Q.7.
Which of the following is true?
a) (C.O.P.)max = (C.O.P.)Carnot / ηCarnot
b) (C.O.P.)max = (C.O.P.)Carnot + ηCarnot
c) (C.O.P.)max = (C.O.P.)Carnot x ηCarnot
d) (C.O.P.)max = (C.O.P.)Carnot – ηCarnot
Q.8.
C.O.P. of the VAR system is lower than the C.O.P. of VCR system.
a) True
b) False
Q.9.
In a VAR system, heating, cooling, and refrigeration take place at temperatures 200°C, 30°C, and -10°C respectively. What is the value of maximum C.O.P. of the system?
a) 2.202
b) 2.808
c) 3.404
d) 2.404
Q.10.
What is the value of maximum C.O.P. if the VAR system has a capacity ofTR and heat given to the refrigerant in the generator iskW?
a) 0.9523
b) 0.4878
c) 1.05
d) 2.05
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