Engineering Sciences
GATE XE topic:engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 1511–1520 of 1772. Imported answers require independent review unless marked reviewed.
Question 2
Open questionXE-EMCQ1 markNeeds review
For a reversible isothermal expansion of one mole of an ideal gas from state 1 to state 2, the magnitude of work done is
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The statement which is NOT a consequence of the first law of thermodynamics is
(A) Heat is a path function
(B) Energy is a property of a system
(C) Energy of an isolated system is not conserved
(D) A perpetual motion machine of the first kind is not possible
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For a refrigerator absorb heat
from a cold region and rejecting heat
to a hot region, the coefficient of performance is written asYour answerChoose one option.
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The value of the compressibility factor at the critical point evaluated using the van der Waals equation of state is
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The vapour pressure of a liquid at 8 °C is 2.7 kPa. Its enthalpy of vaporization is constant and equal to 4700 kJ/kmol. Take R = 8.314 kJ/kmol.K. The temperature (in °C) at a vapour pressure of 13.5 kPa is
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Open questionXE-ENAT1 markNeeds review
One kmol of an ideal gas (C
= 21 kJ/kmol.K) undergoes a constant pressure process from 300 K to 500 K. The molar entropy of the gas at 300 K is 150 kJ/kmol.K. The molar entropy (in kJ/kmol.K) at 500 K (up to 1 decimal place) is ________.Log in to check the answer
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Open questionXE-ENAT1 markNeeds review
A spring, having a spring constant of 350 kN/m, is initially compressed by 0.4 cm. The work required (in J) to compress it by another 0.6 cm (up to 1 decimal place) is ________.
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An ideal gas has a molar mass of 40 kg/kmol. Take R = 8.314 kJ/kmol.K. At a pressure of 2 bar and a temperature of 300 K, the volume (in m
) of 1 kg of this gas (up to 2 decimal places) is ________.Log in to check the answer
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Open questionXE-EMCQ2 marksNeeds review
Consider the following statements for an ideal gas undergoing a reversible non-flow process:
P. If the process is adiabatic, the change in enthalpy of the gas is necessarily zero.
Q. If the process is adiabatic, the change in entropy of the gas is necessarily zero.
R. If the process is isothermal, the change in enthalpy of the gas is necessarily zero.
S. If the process is isothermal, the change in entropy of the gas is necessarily zero.
Which one of the following options is valid?
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Open questionXE-EMCQ2 marksNeeds review
An ideal Otto cycle (O) and an ideal diesel cycle (D) have the same maximum temperature and reject equal amount of heat. Also, the working fluid enters at the same state before compression. One of the following statements always true about their efficiencies (
) isYour answerChoose one option.
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