Freon group of refrigerants are___________________?

Related Mcqs:

1. Which of the following refrigerants has lowest freezing point_______________?

   A. Freon-12
   B. NH3
   C. C02
   D. Freon-22
   E. S02

2. 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

3. Moisture in freon refrigeration system causes________________?

   A. ineffective refrigeration
   B. high power consumption
   C. freezing automatic regulating valve
   D. corrosion of whole system
   E. breakdown of refrigerant

4. 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

5. The moisture in a refrigerant is removed by___________________?

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

6. Ammonia-absorption refrigeration cycle requires__________________?

   A. very little work input
   B. maximum work input
   C. nearly same work input as for vapour compression cycle
   D. zero work input
   E. none of the above

7. Air refrigeration operates on_____________________?

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

8. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?

   A. condensation of the refrigerant vapour
   B. evaporation of the refrigerant liquid
   C. compression of the refrigerant vapour
   D. metering of the refrigerant liquid
   E. none of the above

9. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

   A. more
   B. less
   C. equally.
   D. unpredictable
   E. none of the above

10. 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