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________________?

Related Mcqs:

1. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?

   A. will be higher
   B. will be lower
   C. will remain unaffected
   D. may be higher or lower depending upon the nature of non-condensable gases
   E. unpredictable

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

   A. bigger
   B. smaller
   C. equal
   D. smaller/bigger depending on capacity
   E. unpredictable

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 vapor compression cycle, the condition of refrigerant is high pressure saturated liquid________________?

   A. after passing through the condenser
   B. before passing through the condenser
   C. after passing through the expansion or thiottle valve
   D. before entering the expansion valve
   E. before entering the compressor

5. The vapor pressure of refrigerant should be_________________?

   A. lower than atmospheric pressure
   B. higher than atmospheric pressure
   C. equal to atmospheric pressure
   D. could be anything
   E. none of the above

6. Condensing temperature in a refrigerator is the temperature_________________?

   A. of cooling medium
   B. of freezing zone
   C. of evaporator
   D. at which refrigerant gas becomes liquid
   E. condensing temperature of ice

7. 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

8. In vapor compression cycle the condition off refrigerant is dry saturated vapor________________?

   A. after passing through the condenser
   B. before passing through the condenser
   C. after passing through the expansion or throttle valve
   D. before entering the expansion valve
   E. before entering the compressor

9. The refrigerant for a refrigerator should have ___________________?

   A. high sensible heat
   B. high total heat
   C. high latent heat
   D. low latent heat
   E. low sensible heat

10. 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