Presence of moisture in a refrigerant affects the working of___________________?

Related Mcqs:

1. The moisture in a refrigerant is removed by___________________?

   A. evaporator
   B. safety relief valve
   C. dehumidifier
   D. driers
   E. expansion valve

2. In vapor compression cycle, the condition of refrigerant is very wet 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

3. A refrigerant should have _____________________?

   Pick up the wrong statement ?
   A. Tow specific heat of liquid
   B. high boiling point
   C. high latent heat of vaporisation
   D. higher critical temperature
   E. low specific volume of vapour

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. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?

   A. less than 2 kg
   B. more than or equal to 3.65 kg
   C. more than 10 kg
   D. there is no such consideration
   E. pone of the above

6. In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?

   A. condenser and expansion valve
   B. compressor and evaporator
   C. expansion valve and evaporator
   D. compressor and condenser
   E. none of the above

7. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?

   A. suction of compressor
   B. delivery of compressor
   C. high pressure side close to receiver
   D. low pressure side near receiver
   E. anywhere in the cycle

8. The coefficient of performance is the ratio of the refrigerant effect to the_________________?

   A. heat of compression
   B. work done by compressor
   C. enthalpy increase in compressor
   D. all of the above
   E. none of the above

9. 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

10. One of the purposes of sub-cooling the liquid refrigerant is to________________?

    A. reduce compressor overheating
    B. reduce compressor discharge temperature
    C. increase cooling effect
    D. ensure that only liquid and not the vapour enters the expansion (throttling) valve
    E. none of the above