Refrigeration and air-conditioning objective questions and answers


6. Air refrigeration cycle is used in.......


   A.Commercial refrigerators

   B.Domestic refrigerators

   C.Air-conditioning

   D.Gas liquefaction


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D.Gas liquefaction

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7. The refrigeran,commonly used in vapour absorption refrigeration systems,is.......


   A.Sulphur dioxide

   B.Ammonia

   C.Freon

   D.Aqua-ammonia


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D.Aqua-ammonia

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8. The boiling point of ammonia is


   A.-10.50C

   B.-30.50C

   C.-33.30C

   C.-77.60C


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C.-33.30C

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9. Which of the following refrigerant has the lowest boiling point?.......


   A.Ammonia

   B.Carbon dioxide

   C.Sulphur dioxide

   D.Freon-12


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B.Carbon dioxide

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10. Which of the following refrigerant is highly toxic and flammable.......


   A.Ammonia

   B.Carbon dioxide

   C.Sulphur dioxide

   D.Freon-12


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A.Ammonia

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