The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. The moisture in a refrigerant is removed by
  2. Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?
  3. Which of the following is not a desirable property of a refrigerant?
  4. The specific humidity during heating and humidification process.
  5. A vapour absorption refrigeration system
  6. Which of the following refrigerant has the lowest boiling point?
  7. The vapour compression refrigerator employs the following cycle
  8. Moisture should be removed from refrigerants to avoid
  9. A refrigerant with the highest critical pressure is
  10. The thermostatic expansion valve operates on the changes in the
  11. Which of the following statement is wrong?
  12. Which of the following statement is correct for ammonia as a refrigerant?
  13. The desirable property of a refrigerant is
  14. An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation…
  15. The dry bulb temperature during sensible heating of air
  16. Which of the following cycles uses air as the refrigerant?
  17. The boiling point of ammonia is
  18. In vapour compression cycle the condition of refrigerant is superheated vapour
  19. The wet bulb depression indicates _________ humidity of the air.
  20. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet…
  21. The lowest temperature during the cycle in a vapour compression system occurs after
  22. The humidification process, on the psychrometric chart is shown by
  23. The bypass factor for a cooling coil
  24. In mechanical refrigeration system, the refrigerant has the maximum temperature
  25. In a vapour compression system, the condition of refrigerant before passing through the condenser is
  26. The refrigerant after condensation process is cooled below the saturation temperature before throttling.…
  27. The freezing point of R-12 is
  28. The wet bulb temperature during sensible heating of air
  29. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
  30. The wet bulb temperature at 100% relative humidity is ________ dew point temperature.