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Refrigeration Air Conditioning
Refrigeration Objective
Quiz 1
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Q.1
What is the work done during an isothermal compression?
a) 2.3 mRT1 ln (p2 / p1)
b) 2.3 mRP1 ln (p2 / p1)
c) 2.3 mRT1 ln (p1 / p2)
d) mRT1 ln (p2 / p1)
Q.2
What is the work done during a polytropic compression?
a) [n / (n – 1)] mR (T2 – T1)
b) [n / (n + 1)] mR (T2 – T1)
c) [n / (n – 1)] mR (T2 + T1)
d) [n / (n + 1)] mR (T2 + T1)
Q.3
What is the work done during an isentropic compression?
a) [n / (n – 1)] mR (T2 – T1)
b) [n / (n + 1)] mR (T2 – T1)
c) [n / (n – 1)] mR (T2 + T1)
d) [n / (n + 1)] mR (T2 + T1)
Q.4
What is the expression for optimum intercooler or intermediate pressure P2 if the cooling ratio is fixed in a compound compression refrigeration system with intercooling?
a) P2 = P1 / P3
b) P2 = P3 / P1
c) P2 = √P1 x P3
d) P2 = ∛P1 x P3
Q.5
Where is the centrifugal compressor mostly suitable?
a) Small displacements and low condensing pressures
b) Small displacements and high condensing pressures
c) Large displacements and low condensing pressures
d) Large displacements and high condensing pressures
Q.6
Where is the reciprocating compressor mostly suitable?
a) Small displacements and low condensing pressures
b) Small displacements and high condensing pressures
c) Large displacements and low condensing pressures
d) Large displacements and high condensing pressures
Q.7
What is the value of swept volume?
a) 188.49
b) 94.2477
c) 47.1238
d) 471.23
Q.8
What is the value of the clearance factor?
a) 0.00465
b) 0.0465
c) 4.029
d) 0.2481
Q.9
What is the value of volumetric efficiency?
a) 1.289
b) 0.5278
c) 1.894
d) 0.775
Q.10
The main disadvantage of centrifugal compressors is surging.
a) False
b) True
0 h : 0 m : 1 s
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