The relative coefficient of performance is_____________________?

Related Mcqs:

1. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?

   A. 0.2
   B. 1.2
   C. 5
   D. 6
   E. 10

2. The coefficient of performance is the ratio of the refrigerant effect to the_________________?

   A. heat of compression
   B. work done by compressor
   C. enthalpy increase in compressor
   D. all of the above
   E. none of the above

3. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?

   A. less than 2 kg
   B. more than or equal to 3.65 kg
   C. more than 10 kg
   D. there is no such consideration
   E. pone of the above

4. In S.J. unit, one ton of refrigeration is equal to___________________?

   A. 210 kJ/min
   B. 21 kJ/min
   C. 420 kJ/min
   D. 840 kJ/min
   E. 105 kJ/min

5. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?

   A. in 1 hour
   B. in 1 minute
   C. in 24 hours
   D. in 12 hours
   E. in 10 hours

6. The refrigerant for a refrigerator should have ___________________?

   A. high sensible heat
   B. high total heat
   C. high latent heat
   D. low latent heat
   E. low sensible heat

7. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

   A. high, of the order of 25°
   B. as low as possible (3 to 11°C)
   C. zero
   D. any value
   E. none of the above

8. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?

   A. increase
   B. decrease
   C. remain unaffected
   D. may increase or decrease depending on the type of refrigerant used
   E. unpredictable

9. Under-cooling in a refrigeration cycle_________________?

   A. increases COP
   B. decreases COF
   C. COP remains unaltered
   D. other factors decide COP
   E. unperdictable

10. Highest temperature encountered in refrigeration cycle should be________________?

    A. near critical temperature of refrigerant
    B. above critical temperature
    C. at critica. temperature
    D. much below critical temperature
    E. could be anywhere