Air refrigeration operates on_____________________?

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. 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

3. Air refrigeration cycle is used in ____________________?

   A. domestic refrigerators
   B. commercial refrigerators
   C. air conditioning
   D. gas liquefaction
   E. such a cycle does not exist

4. 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

5. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?

   A. compression
   B. direct
   C. indirect
   D. absorption
   E. none of the above

6. 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

7. Under-cooling in a refrigeration cycle_________________?

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

8. One ton of the refrigeration is_________________?

   A. the standard unit used in refrigeration problems
   B. the cooling effect produced by melting 1 ton of ice
   C. the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
   D. the refrigeration effect to produce 1 ton of ice at NTP conditions
   E. the refrigeration effect to produce 1 ton of ice in 1 hour time

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

   A. 1 : 1
   B. 1 : 9
   C. 9 : 1
   D. 1 : 3
   E. 3 : 1

10. 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