Moisture in freon refrigeration system causes________________?

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. 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

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. 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

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. 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

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. 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

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