Engineering Sciences
2017 · Paper 1
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Complete GATE XE 2017 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 91–93 of 175. Imported answers require review unless explicitly marked reviewed.
Question 91
Open questionXE-ENAT2 marksNeeds review
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 _________.Log in to check the answer
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Open questionXE-ENAT2 marksNeeds review
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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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 93
Open questionXE-EMCQ2 marksNeeds review
A pure substance (
= 0.733 kJ/kg.K) undergoes a reversible process in which its temperature increases linearly from 40°C to 85°C and its specific entropy increases by 600 J/kg.K. The work done by the system in kJ/kg isYour answerChoose one option.
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