RAC Lab
Q1. Which of the following represents sensible cooling on the psychrometric chart?
a. Inclined line
b. Curve
c. Vertical line
d. Horizontal line
Q2. Which of the following refrigerants is having the lowest C.O.P for refrigeration systems working under the temperature limits of -15°C and 30°C as evaporator and condenser temperature respectively?
a. R–30
b. CO2
c. Ammonia
d. R-12
Q3. How is the cascade system achieved?
a. VCR system in a parallel combination
b. VAR system in a series combination
c. VCR system in a series combination
d. VAR system in a parallel combination
Q4. Find the C.O.P. of a refrigeration system if the work input is 30 KJ/kg and refrigeration effect produced is 120 KJ/kg of refrigerant flowing.
a. 3
b. 0.75
c. 4
d. 0.25
Q5. If the Coefficient of performance of a heat pump is 5, then what is the value of the Coefficient of performance of the refrigerator operating under the same conditions?
a. 0.2
b. 4
c. 3
d. 0.3
