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Carbon dioxide is

A. Colourless

B. Odourless

C. Non-flammable

D. All of these

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  1. The process, generally used in winter air-conditioning to warm and humidity the air, is called
  2. In a saturated air-water vapour mixture, the
  3. During sensible heating of air _________ decreases.
  4. The Freon group of refrigerants are
  5. A thermostatic expansion valve in a refrigeration system
  6. The evolution of heat of solution takes place in ammonia absorption plant when
  7. The lowest temperature during the cycle in a vapour compression system occurs after
  8. The relative humidity lines on a psychrometric chart are
  9. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression…
  10. Degree of saturation or percentage humidity is
  11. An evaporator is also known as
  12. The domestic refrigerator uses following type of compressor
  13. Chaperon equation is a relation between
  14. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  15. One of the purposes of sub cooling the liquid refrigerant is to
  16. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
  17. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
  18. The mass of water vapour present in __________ is called absolute humidity.
  19. During adiabatic saturation process on unsaturated air __________ remains constant.
  20. Absorption system normally uses the following refrigerant
  21. Critical temperature is the temperature above which
  22. Short horizontal lines on pressure-enthalpy chart show
  23. During heating and humidification, the final relative humidity of air
  24. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes…
  25. The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative…
  26. The thermostatic expansion valve operates on the changes in the
  27. The centrifugal compressors are generally used for refrigerants that require
  28. The material of pipe lines for a system using Freon as a refrigerant should be
  29. Moisture should be removed from refrigerants to avoid
  30. The vapour pressure of refrigerant should be