If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be_________________?

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. Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

   A. 1.25
   B. 0.8
   C. 0.5
   D. 0.25
   E. none of the above

3. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?

   A. small
   B. high
   C. euqal
   D. anything
   E. under some conditions small and under some conditions high

4. 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

5. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

   A. more
   B. less
   C. equally.
   D. unpredictable
   E. none of the above

6. The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will__________________?

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

7. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

   A. same
   B. more
   C. less
   D. more/less depending on rating
   E. unpredictable

8. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?

   A. same
   B. more
   C. less
   D. more or less depending on ambient conditions
   E. unpredictable

9. The value of COP in vapour compression cycle is usually__________________?

   A. always less than unity
   B. always more than unity
   C. equal to unity
   D. any one of the above
   E. none of the above

10. 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