For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

A. Copper

B. Aluminium

C. Steel

D. Brass

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  1. The higher temperature in vapour compression cycle occurs at
  2. Which of the following refrigerant has the highest freezing point.
  3. The centrifugal compressors are generally used for refrigerants that require
  4. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature…
  5. Which of the following statement is correct?
  6. The evaporator used in household refrigerators is
  7. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering…
  8. The dehumidification process, on the psychrometric chart, is shown by
  9. During sensible cooling of air, specific humidity
  10. A standard ice point temperature corresponds to the temperature of
  11. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
  12. The advantage of dry compression is that
  13. The superheating in a refrigeration cycle
  14. The wet bulb temperature during sensible heating of air
  15. The capillary tube, as an expansion device, is used in
  16. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in…
  17. The operating pressure for refrigerating units using R-12 as a refrigerant is
  18. The refrigerant for a refrigerator should have
  19. In which of the following refrigeration system, waste heat can be effectively used?
  20. The air cooling system mostly used in transport type aircrafts is
  21. The curved lines on a psychrometric chart indicates
  22. The thermostatic expansion valve operates on the changes in the
  23. The specific humidity during heating and humidification process.
  24. In a refrigeration system, the expansion device is connected between the
  25. Air refrigerator works on
  26. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of…
  27. An Electrolux refrigerator is called a __________ absorption system.
  28. The reciprocating refrigerant compressors are very suitable for
  29. In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is
  30. A good refrigerant should have