GATE ME
Thermodynamics
Second Law of Thermodynamics
Previous Years Questions

## Marks 1

A heat pump absorbs $$10$$ $$kW$$ of heat from outside environment at $$250$$ $$K$$ while absorbing $$15$$ $$kW$$ of work. It delivers the heat to a r...
The heat removal rate from a refrigerated space and the power input to the compressor are $$7.2$$ $$kW$$ and $$1.8$$ $$kW$$, respectively. The coeffic...
The $$COP$$ of a Carnot heat pump operating between $${6^ \circ }C$$ and $${37^ \circ }C$$ is ____________
A Carnot engine $$(CE$$-$$1)$$ works between two temperature reservoirs $$A$$ and $$B,$$ where $${T_A} = 900K$$ and $${T_B} = 500K.$$ A second Carnot ...
A reversed Carnot cycle refrigerator maintains a temperature of $$- {5^ \circ }C.$$ The ambient air temperature is $${35^ \circ }C.$$ The heat gained...
The following four figures have been drawn to represent a fictitious thermodynamic cycle, on the $$P$$-$$v$$ and $$T$$-$$S$$ plates According to th...
An industrial heat pump operates between the temperatures of $${27^ \circ }C$$ and $$- {13^ \circ }C.$$ The rates of heat addition and heat rejection...
Consider a refrigerator and a heat pump working on the reversed Carnot cycle between the same temperature limits. Which of the following is correct?
In the case of a refrigeration system undergoing an irreversible cycle, $$\oint {{{SQ} \over T}}$$ is _____________$$\left( { < 0/ = 0/ > 0} \... Any thermodynamic cycle operating between two temperature limits is reversible if the product of efficiency when operating as a heat engine and the co... A reversible heat transfer demands: A condenser of a refrigeration system rejects heat at a rate of$$120kW,$$while its compressor consumes a power of$$30kW.$$The coefficien... ## Marks 2 A reversible cycle receives$$40kJ$$of heat from one heat source at a temperature of$${127^ \circ }C$$and$$37kJ$$from another heat sour... A reversible heat engine receives$$2kJ$$of heat from a reservoir at$$1000K$$and a certain amount of heat from a reservoir at$$800K...
A heat transformer is a device that transfers a part of the heat, supplied to it at an intermediate temperature, to a high temperature reservoir while...
An irreversible heat engine extracts heat from a high temperature source at a rate of $$100kW$$ and rejects heat to a sink at a rate of $$50kW.$$ The ...
A heat engine having an efficiency of $$70\%$$ is used to drive a refrigerator having a coefficient of performance of $$5.$$ The energy absorbed from...
A solar collector receiving solar radiation at the rate of $$0.6$$$$kW/{m^2}$$ transforms it to the internal energy of a fluid at an overall efficienc...
A Carnot cycle is having an efficiency of $$0.75.$$ If the temperature of the high temperature reservoir is $${727^ \circ }C,$$ what is the temperatur...
A cyclic heat engine does $$50$$ $$kJ$$ of work per cycle. If the efficiency of the heat engine is $$75\%$$, then heat rejected per cycle is
A solar energy based heat engine which receives $$80$$ $$kJ$$ of heat at $${100^ \circ }C$$ and rejects $$70$$ $$kJ$$ of heat to the ambient at $${30^... For two cycles coupled in series, the topping cycle has an efficiency of$$30\% $$and the bottoming cycle has an efficiency of$$20\% $$. The overall... Round the clock cooling of an apartment having a load of$$300MJ/day requires and air-conditioning plant of capacity about
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