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

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

   A.Sulphur dioxide

   B.Ammonia

   C.Freon

   D.Aqua-ammonia

8. The boiling point of ammonia is

   A.-10.5⁰C

   B.-30.5⁰C

   C.-33.3⁰C

   C.-77.6⁰C

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

   A.Ammonia

   B.Carbon dioxide

   C.Sulphur dioxide

   D.Freon-12

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

   A.Ammonia

   B.Carbon dioxide

   C.Sulphur dioxide

   D.Freon-12

< 1 2 3 4 5 6 7 8 9 10 Next Page>