Under-cooling in a refrigeration cycle_________________?

Related Mcqs:

1. 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

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. The vapor compression refrigerator employs the following cycle_________________?

   A. Rankine
   B. Carnot
   C. Reversed Rankine
   D. Brayton
   E. Reversed Carnot

4. Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

   A. 1.25
   B. 0.8
   C. 0.5
   D. 0.25
   E. none of the above

5. In S.J. unit, one ton of refrigeration is equal to___________________?

   A. 210 kJ/min
   B. 21 kJ/min
   C. 420 kJ/min
   D. 840 kJ/min
   E. 105 kJ/min

6. 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

7. 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

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

   A. vapour compression
   B. vapour absorption
   C. carnot cycle
   D. electrolux refrigerator
   E. dual cycle

10. 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