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

Related Mcqs:

1. 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_________________?

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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?

   A. collect liquid refrigerant and prevent it from going to compressor
   B. detect liquid in vapour
   C. superheat the vapour
   D. collect vapours
   E. increase refrigeration effect

9. Formation of frost on evaporator in refrigerator ________________?

   A. results in loss of heat due to poor heat transfer
   B. increases heat transfer rate
   C. is immaterial
   D. can be avoided by proper design
   E. decreases compressor power

10. For obtaining high COP, the pressure range of compressor should be_______________?

    A. high
    B. low
    C. optimum
    D. any value
    E. there is no such criterion