Heat Transfer

Question: A good refrigerant should have [A]. high latent heat of vaporisation and low freezing point [B]. high operating pressures and low freezing point [C]. high specific volume and high latent heat of vaporisation [D]. low C.O.P. and low freezing point Answer: Option A Explanation: No answer description available for this question.

Question: In a lithium bromide absorption refrigeration system [A]. lithium bromide is used as a refrigerant and water as an absorbent [B]. water is used as a refrigerant and lithium bromide as an absorbent [C]. ammonia is used as a refrigerant and lithium bromide as an absorbent [D]. none of the above Answer: Option B…

Question: Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator. [A]. equalise [B]. reduce [C]. increase Answer: Option C Explanation: No answer description available for this question.

Question: An electrolux refrigerator is called a __________ absorption system. [A]. single fluid [B]. two fluids [C]. three fluids Answer: Option C Explanation: No answer description available for this question.

Question: In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively [A]. water and water [B]. water and lithium bromide [C]. ammonia and lithium bromide [D]. ammonia and water Answer: Option D Explanation: No answer description available for this question.

Question: In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in [A]. condenser [B]. evaporator [C]. absorber [D]. none of these Answer: Option A Explanation: No answer description available for this question.

Question: In which of the following refrigeration system, waste heat can be effectively used? [A]. Vapour compression cycle [B]. Vapour absorption cycle [C]. Air refrigeration cycle [D]. none of these Answer: Option B Explanation: No answer description available for this question.

Question: A vapour absorption refrigeration system [A]. gives noisy operation [B]. gives quiet operation [C]. requires little power consumption [D]. cools below 0° C Answer: Option B Explanation: No answer description available for this question.

Question: In electrolux refrigerator [A]. ammonia is absorbed in hydrogen [B]. ammonia is absorbed in water [C]. ammonia evaporates in hydrogen [D]. hydrogen evaporates in ammonia Answer: Option C Explanation: No answer description available for this question.

Question: In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by [A]. liquid pump [B]. generator [C]. absorber and generator [D]. absorber, generator and liquid pump Answer: Option D Explanation: No answer description available for this question.