Heat Transfer

Question: In aircraft, air refrigeration Cycle is used because of [A]. low weight per tonne of refrigeration [B]. high heat transfer rate [C]. low temperature at high altitudes [D]. higher coefficient of performance Answer: Option A Explanation: No answer description available for this question.

Question: In a reversed Brayton cycle, the heat is absorbed by the air during [A]. isentropic compression process [B]. constant pressure cooling process [C]. isentropic expansion process [D]. constant pressure expansion process Answer: Option D Explanation: No answer description available for this question.

Question: A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration. [A]. same [B]. lower [C]. higher Answer: Option B Explanation: No answer description available for this question.

Question: A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance. [A]. Agree [B]. Disagree Answer: Option A Explanation: No answer description available for this question.

Question: In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is [A]. reversed Carnot cycle [B]. reversed Joule cycle [C]. reversed Brayton cycle [D]. reversed Otto cycle Answer: Option C Explanation: No answer description available for this question.

Question: If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature. [A]. increases [B]. decreases Answer: Option B Explanation: No answer description available for this question.

Question: If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature. [A]. Yes [B]. No Answer: Option A Explanation: No answer description available for this question.

Question: The C.O.P. of a heat pump working on a reversed Carnot cycle is [A]. [B]. [C]. [D]. Answer: Option D Explanation: No answer description available for this question.

Question: In a refrigerating machine, heat rejected is __________ heat absorbed. [A]. equal to [B]. less than [C]. greater than Answer: Option C Explanation: No answer description available for this question.

Question: The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature) [A]. [B]. [C]. [D]. Answer: Option A Explanation: No answer description available for this question.