Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?

Related Mcqs:

1. The leaks in a refrigeration system using Freon are detected by____________________?

   A. halide torch which on detection produces greenish flame lighting
   B. sulphur sticks which on detection gives white smoke
   C. using reagents
   D. smelling
   E. sensing reduction in pressure

2. Moisture in freon refrigeration system causes________________?

   A. ineffective refrigeration
   B. high power consumption
   C. freezing automatic regulating valve
   D. corrosion of whole system
   E. breakdown of refrigerant

3. 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

4. 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

5. 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

6. 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

7. 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

8. In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?

   A. more
   B. less
   C. same
   D. more for small capacity and less for high capacity
   E. less for small capacity and more for high capacity

9. Freon group of refrigerants are___________________?

   A. inflammable
   D. toxic
   C. non-inflammable and toxic
   D. non-toxic and inflammable
   E. non-toxic and non-inflammable

10. 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