Most of the domestic refrigerators work on the following refrigeration system _________________?

Related Mcqs:

1. 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

2. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

   A. high, of the order of 25°
   B. as low as possible (3 to 11°C)
   C. zero
   D. any value
   E. none of the above

3. The bank of tubes at the back of domestic refrigerator are _________________?

   A. condenser tubes
   B. evaporator tubes
   C. refrigerant cooling tubes
   D. capillary tubes
   E. throttling device

4. Refrigeration in aeroplanes usually employs the following refrigerant___________________?

   A. Co2
   B. Freon-11
   C. Freon-22
   D. Air
   E. none of the above

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 general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?

   A. 0.1 to 0.5 h.p. per ton of refrigeration
   B. 0.5 to 0.8 h.p. per ton of refrigeration
   C. 1 to 2 h.p. per ton of refrigeration
   D. 2 to 5 h.p. per ton of refrigeration
   E. 5 to 10 h.p. per ton refrigeration

7. An important characteristic of absorption system of refrigeration is__________________?

   A. noisy operation
   B. quiet operation
   C. cooling below 0°C
   D. very little power consumption
   E. its input only in the form of heating

8. Super heating in a refrigeration cycle __________________?

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

9. Reducing suction pressure in refrigeration cycle_________________?

   A. lowers evaporation temperature
   B. increases power required per ton of refrigeration
   C. lowers compressor capacity because vapour is lighter
   D. reduces weight displaced by piston
   E. all 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