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

Related Mcqs:

1. 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

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 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. Super heating in a refrigeration cycle __________________?

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