The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?

Related Mcqs:

1. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

   A. Ammonia
   B. Carbon dioxide
   C. Freon
   D. Brine
   E. Hydrocarbon refrigerant

2. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?

   A. collect liquid refrigerant and prevent it from going to compressor
   B. detect liquid in vapour
   C. superheat the vapour
   D. collect vapours
   E. increase refrigeration effect

3. 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

4. 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

5. The domestic refrigerator uses following type of compressor ____________________?

   A. centrifugal
   B. axial
   C. miniature sealed unit
   D. piston type reciprocating
   E. none of the above

6. For obtaining high COP, the pressure range of compressor should be_______________?

   A. high
   B. low
   C. optimum
   D. any value
   E. there is no such criterion

7. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

   A. same
   B. more
   C. less
   D. more/less depending on rating
   E. unpredictable

8. The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?

   A. more
   B. less
   C. same
   D. more/less depending on size of plant
   E. unpredictable

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. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?

    A. atmospheric pressure
    B. slightly above atmospheric pressure
    C. 2-4 bars
    D. 5-6 bars
    E. 7-10 bars