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II Attempt any four sub parts each question carries 1 mark 1X4 4 5 Carnot...

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II Attempt any four sub parts each question carries 1 mark 1X4 4 5 Carnot engine is an ideal heat engine which converts heat energy into mechanical energy Efficiency of Carnot engine is given by n 1 T T Where T is the temperature of source and T is temperature of sink If Q is the amount of heat absorbed cycle from source Q is the amount of heat rejected cycle to the sink and W is the amount of useful work done cycle then W Q Q and Q Q T T With the help of the passage given above choose the most appropriate alternative for each of the following questions i A Carnot engine absorbs 6x10 cal At 227 C Heat rejected to the sink at 127 C is a 6x10 cal b 4 8x10 cal c 4x 10 cal d 5x10 cal ii Work done cycle by the engine in the above question is a 5 04x10 J b 5 04x10 cal d 4 8x105 J c 4 8x10 cal iii Efficiency of the engine in the above question is a 30 b 10 d 80 c 20 iv At what temperature should the sink be maintained to increase the efficiency by 10 a 77K c 300 C What should be the temperature of the source to increase the efficiency to 30 a 298 4 C b 298 4K V b 300K d 77 C

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