Engineering Sciences
GATE XE topic:engineering-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 1161–1170 of 1772. Imported answers require independent review unless marked reviewed.
Question 2
Open questionXE-EMCQ1 markNeeds review
Internal energy of a thermodynamic system is defined by the
Your answerChoose one option.
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In a polytropic process described by
, if
, the process is called asYour answerChoose one option.
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Open questionXE-EMCQ1 markNeeds review
The relation between the coefficient of performance of a refrigerator
and the coefficient of performance of a heat pump
isYour answerChoose one option.
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Open questionXE-EMCQ1 markNeeds review
If
,
and
are the latent heats of vaporization at the critical temperature of nitrogen, water and ammonia, respectively, then which one of the followings is true?Your answerChoose one option.
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Open questionXE-ENAT1 markNeeds review
A new temperature scale (°N) has been proposed where the normal freezing and normal boiling points of water are marked as 500 °N and 100 °N, respectively. If the temperature of a system is measured to be 0 °N, its temperature according to the Celsius scale (in °C) is ________.
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Let
represents the compressibility factor of air at 2 bar and 600 K,
represents the compressibility factor of air at 1 bar and 300 K. If air is assumed to be an ideal gas having gas constant of 0.287 kJ/kg.K, then
is ________.Log in to check the answer
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Open questionXE-ENAT1 markNeeds review
The rate of heat received by a heat engine from a source at 900 K is 600 kJ/s. The engine rejects heat to the sink of 300 K. The heat engine produces a power of 200 kW. The irreversibility rate (in kW) of the process is ________.
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Open questionXE-ENAT1 markNeeds review
An engine working on the air standard Diesel cycle has a compression ratio of 18. The cycle has a cut-off ratio of 1.7. If the ratio of specific heats of air is 1.4, then the thermal efficiency (in %) of the cycle (rounded off to 1 decimal place) is ________.
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Open questionXE-EMCQ2 marksNeeds review
A system with rigid wall is initially at a temperature of
. It is used as the heat source for a heat engine, which rejects heat to a reservoir maintained at
(
). The specific heats of the system are constant. If the temperature of the system finally reduces to
, then the maximum work recoverable from the heat engine per unit mass of the system isYour answerChoose one option.
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Open questionXE-EMCQ2 marksNeeds review
A reversible heat engine is operating between two reservoirs maintained at
and
, where
. Which one of the following is the most effective option for increasing its thermal efficiency?Your answerChoose one option.
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