The centrifugal compressors are generally used for refrigerants that require

A. Small displacements and low condensing pressures

B. Large displacements and high condensing pressures

C. Small displacements and high condensing pressures

D. Large displacements and low condensing pressures

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  1. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance…
  2. Dry bulb temperature is the temperature of air recorded by a thermometer, when
  3. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking…
  4. A bootstrap air cooling system has
  5. The sub-cooling in a refrigeration cycle
  6. An important characteristic of absorption system of refrigeration is
  7. During dehumidification process, the relative humidity
  8. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity…
  9. The emissivity of a polished silver body is __________ as compared to black body.
  10. Air refrigeration cycle is used in
  11. The operating pressure for refrigerating units using R-12 as a refrigerant is
  12. The refrigerant after condensation process is cooled below the saturation temperature before throttling.…
  13. A thermostatic expansion valve in a refrigeration system
  14. The specific humidity during cooling and dehumidification
  15. The advantage of dry compression is that
  16. The boiling point of ammonia is
  17. Which of the following refrigerant has the lowest boiling point?
  18. The evolution of heat of solution takes place in ammonia absorption plant when
  19. Which of the following statement is correct for ammonia as a refrigerant?
  20. An Electrolux refrigerator is called a __________ absorption system.
  21. The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
  22. In Electrolux refrigerator
  23. The process of under-cooling is generally brought about by
  24. When the air is passed through an insulated chamber having sprays of water maintained at a temperature…
  25. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
  26. The specific humidity during humidification process
  27. The reciprocating refrigerant compressors are very suitable for
  28. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being…
  29. The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.
  30. The dry bulb temperature during sensible heating of air