The operating pressure for refrigerating units using R-12 as a refrigerant is

A. 2 bar

B. 8 bar

C. 15 bar

D. 30 bar

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  1. During cooling and dehumidification, dry bulb temperature
  2. An evaporator is also known as
  3. The evaporator used in household refrigerators is
  4. The pressure at the inlet of a refrigerant compressor is called
  5. Chaperon equation is applicable for registration at
  6. The refrigerant after condensation process is cooled below the saturation temperature before throttling.…
  7. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line…
  8. Degree of saturation or percentage humidity is
  9. The vapour compression refrigerator employs the following cycle
  10. The vapour pressure of refrigerant should be
  11. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity…
  12. The relative coefficient of performance is
  13. The dehumidification process, on the psychrometric chart, is shown by
  14. The reciprocating refrigerant compressors are very suitable for
  15. A vapour absorption refrigerator uses __________ as a refrigerant.
  16. Most air cooled condensers are designed to operate with a temperature difference of
  17. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  18. The specific humidity during heating and humidification process.
  19. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will…
  20. Which of the following refrigerants has lowest freezing point?
  21. During sensible cooling of air, specific humidity
  22. The emissivity of a polished silver body is __________ as compared to black body.
  23. Rating of a domestic refrigerator is of the order of
  24. Short horizontal lines on pressure-enthalpy chart show
  25. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required…
  26. During humidification process, __________ increases.
  27. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
  28. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
  29. Presence of moisture in a refrigerant affects the working of
  30. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature…