Efficiency of a reversible heat engine is given by

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• One reversible heat engine operates between 1600 K & T₂ K & another reversible heat engine operates between T₂ K & 400 K. If both the engines have the temperature T₂ must be equal to
• A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227°C. The heat is rejected at 27°C. The cycle is reversible, if the amount of heat rejected is
• According to Carnot’s theorem, all heat engines operating between a given constant temperature source and sink, none has a higher efficiency than a reversible engine.
• The efficiency of all reversible heat engines operating between the same heat reservoirs is
• A reversible engine performing as engine has efficiency of 62.5%. If it is reversed to work as refrigerator its COP will be
• A reversible engine performing as refrigerator has COP=33%. If the same machine operates as engine, its efficiency will be
• a heat engine receives heat at the rate of 1500 kJ/min.& gives an output of 8.2 kW. Its thermal efficiency is equal to
• An engine receives 15152 J/s of heat & produces 5 KW of power. The efficiency of the engine is
• In a cyclic heat engine operating between a source temperature of 600°C & a sink temperature of 20°C, the least rate of heat rejection per kW net output of the engine is
• A heat engine using lake water at 12° C as source & the surrounding atmosphere at 2°C as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57J, then the output of the engine will be