Refrigeration and air-conditioning objective questions and answers

36. The domestic type of refrigerator uses.......compressor

   A.Centrifugal

   B.Axial

   C.Miniature scaled unit

   D.Piston type reciprocating

37. Refrigeration of aeroplane uses.......

   A.CO₂

   B.Air

   C.Freon-11

   D.Freon-22

38. Absorption system normally uses following refrigerant....

   A.CO₂

   B.SO₂

   C.Freon-11

   D.Freon-22

   D.Ammonia

39. The vapour pressure of the refrigerant should be.......

   A.Lower than atmospheric pressure

   B.Higher than atmospheric pressure

   C.Equal than atmospheric pressure

   D.None of the above

40. The bank of tube at the back of domestic refrigerator are.......

   A.Condenser tube

   B.Evaporator tube

   C.Refrigerant colling tubes

   D.Capillary tubes

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