The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?

Related Mcqs:

1. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process ________________?

   A. involves no change in volume
   B. takes place at constant temperature
   C. takes place at constant entropy
   D. takes place at constant enthalpy
   E. takes place at constant pressure

2. Short horizontal lines on pressure-enthalpy chart show__________________?

   A. constant pressure lines
   B. constant temperature lines
   C. constant total heat lines
   D. constant entropy lines
   E. constant volume lines

3. 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

4. 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

5. Ammonia-absorption refrigeration cycle requires__________________?

   A. very little work input
   B. maximum work input
   C. nearly same work input as for vapour compression cycle
   D. zero work input
   E. none of the above

6. In a refrigeration cycle, the flow of refrigerant is controlled by___________________?

   A. compressor
   B. condenser
   C. evaporator
   D. expansion valve
   E. all of the above

7. Super heating in a refrigeration cycle __________________?

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

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. 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

10. 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