EASY
Agniveer Vayu
IMPORTANT
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In a refrigerator, the low temperature coil of evaporator is at and the compressed gas in the condenser has a temperature of . The amount of electrical energy spent in freezing 1 kg of water at
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Important Questions on Thermodynamics
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Agniveer Vayu
IMPORTANT
A refrigerator is to maintain eatables kept inside at . The coefficient of performance of refrigerator, if room temperature is , will be:
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Agniveer Vayu
IMPORTANT
The coefficient of performance of refrigerator whose efficiency is , is:
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Agniveer Vayu
IMPORTANT
A refrigerator with coefficient of performance releases of heat to a hot reservoir. Then the work done on the working substance is
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Agniveer Vayu
IMPORTANT
A Carnot engine having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is , the amount of energy absorbed from the reservoir at lower temperature is
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Agniveer Vayu
IMPORTANT
Entropy of the universe tends to be
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Agniveer Vayu
IMPORTANT
The energy released in a modest size atomic bomb ( ) is about . On a monsoon day in Mumbai, there was a heavy rainfall of about over an area of about . The energy released in the atmosphere on that day is roughly equivalent to that released in
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Agniveer Vayu
IMPORTANT
An ideal gas is reversibly around the cycle as shown on the (temperature) (entropy) diagram
The most appropriate representation of the above cycle on a (internal energy) (volume) diagram is-
EASY
Agniveer Vayu
IMPORTANT
Two carnot engines and are operated in series. The first one, receives heat at and rejects to a reservoir at temperature The second engine receives heat rejected by the first engine and, in turn, rejects to a heat reservoir at Calculate the temperature if the work outputs of the two engines are equal:
