Basics of Mechanical Engineering

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MCQ ~ Vapour Compression Refrigeration System

1. During a refrigeration cycle, heat is rejected by the refrigerant in a

  • Compressor
  • Condenser
  • Evaporator
  • Expansion valve
2. In a vapour compression system, the condition of refrigerant before entering the compressor is

  • Saturated liquid
  • Wet vapour
  • Dry saturated liquid
  • Superheated vapour
3. The highest temperature during the cycle, in a vapour compression system, occurs after

  • Compression
  • Condensation
  • Expansion
  • Evaporation
4. In a vapour compression system, the lowest temperature during the cycles occurs after

  • Compression
  • Condensation
  • Expansion
  • Evaporation
5. The sub-cooling in a refrigeration cycle

  • Does not alter C.O.P
  • Increases C.O.P
  • Decreases C.O.P
6. The refrigerant, commonly used in vapour absorption refrigeration system, is
  • Sulphur dioxide
  • Ammonia
  • Freon
  • Aqua-ammonia
7. In ammonia-hydrogen refrigerator
  • Ammonia is absorbed in hydrogen
  • Ammonia is absorbed in water
  • Ammonia evaporates in hydrogen
  • Hydrogen evaporates in ammonia
8. Which of the following refrigerants has the lowest boiling point?
  • Ammonia
  • Carbon dioxide
  • Sulphur dioxide
  • Freon-12
9. Which of the following refrigerant is highly toxic and flammable?
  • Ammonia
  • Carbon dioxide
  • Sulphur dioxide
  • Freon-12
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