GATE XE Second Law of Thermodynamics PYQs & Answers — Page 5

Questions 41–43 of 43. Imported answers require independent review unless marked reviewed.

A heat engine receives

kJ of heat from a hot reservoir and rejects

kJ of heat to a cold reservoir. The work delivered by the heat engine is entirely supplied to a heat pump, which receives

kJ of heat from another reservoir and rejects

kJ of heat to the same cold reservoir. If the efficiency of the heat engine is 0.4 and COP of the heat pump is 4.0, the value of

(up to 1 decimal place) is _________.

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A block of ice of mass 2 kg at 0°C is dropped into an insulated vessel containing 10 kg of liquid water at 25°C. The latent heat of melting of ice is 330 kJ/kg and specific heat of water is 4.2 kJ/kg.K. The change in the entropy of the universe in kJ/K (up to 3 decimal places) is _________.

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An ideal gas having a mass of 0.5 kg is initially at 300 kPa, 80°C and occupies a volume of 0.14 m³. The gas undergoes an adiabatic process, where 50 kJ of work is transferred to the gas. The pressure and volume at the final state are 300 kPa and 0.20 m³. The change in the entropy of the gas in J/K is

Your answerChoose one option.

160.3

175.3

190.3

195.3

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GATE XE Second Law of Thermodynamics PYQs

Question 91

Question 92

Question 94