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In which of the following refrigeration system, waste heat can be effectively used?

A. Vapour compression cycle

B. Vapour absorption cycle

C. Air refrigeration cycle

D. None of these

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  1. The relative coefficient of performance is equal to
  2. Which of the following statement is wrong?
  3. The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which…
  4. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the…
  5. The centrifugal compressors are generally used for refrigerants that require
  6. The advantage of dry compression is that
  7. Most thermostatic expansion valves are set for a superheat of
  8. In mechanical refrigeration system, the refrigerant has the maximum temperature
  9. The wet bulb temperature during sensible cooling of air
  10. One of the purposes of sub cooling the liquid refrigerant is to
  11. The undesirable property of a refrigerant is
  12. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature,…
  13. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
  14. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water…
  15. The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to
  16. Moisture in Freon refrigeration system causes
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  18. Which of the following refrigerant has the lowest freezing point?
  19. Freon group of refrigerants are
  20. The index which correlates the combined effects of air temperature, relative humidity and air velocity…
  21. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature…
  22. For obtaining high COP, the pressure range of compressor should be
  23. Which of the following statement is correct for ammonia as a refrigerant?
  24. The dehumidification process, on the psychrometric chart, is shown by
  25. The optimum effective temperature for human comfort is
  26. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking…
  27. The COP of a vapour compression plant in comparison to vapour absorption plant is
  28. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet…
  29. Mass flow ratio of NH₃ in comparison to Freon12 for same refrigeration load and same temperature…
  30. The leakage in a refrigeration system using ammonia is detected by