GATE XE topic:thermodynamic-relations PYQs & Answers — Page 2

Questions 11–20 of 31. Imported answers require independent review unless marked reviewed.

Match the following:

Thermodynamic function/equation	Expression
A1 Helmholtz function (a)	B1
A2 Gibbs function (g)	B2
A3 T-ds equation	B3
A4 Clapeyron-Clausius equation	B4

Your answerChoose one option.

A1→B2, A2→B4, A3→B1, A4→B3

A1→B4, A2→B2, A3→B1, A4→B3

A1→B2, A2→B4, A3→B3, A4→B1

A1→B4, A2→B2, A3→B3, A4→B1

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In a liquid-vapor phase change process,

at 100 °C for saturated water is 370 Pa/K. If the resulting change in specific volume

is 1.672 m

/kg, the enthalpy of vaporization (

) will be ______ kJ/kg (in integer).

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The energy equation for a reversible non-flow process can be expressed as

, where

is the heat transfer per unit mass,

is the internal energy per unit mass,

is the pressure, and

is the mass specific volume. This energy equation is not in exact differential form. It can be made exact differential by multiplying with the following integrating factor: (T is the absolute temperature)

Your answerChoose one option.

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One of the Maxwell equations is expressed as

, where

is the entropy per unit mass,

is the mass specific volume,

is the pressure, and

is the temperature. In this expression,

is a continuous function of

and

. The derivatives of

are also continuous. Let

be specific heat capacity at constant volume for a gas. Then,

can be written as

Your answerChoose one option.

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The general relation among the properties

and

at any state point can be expressed as

. If

and

are continuous functions and

is the Joule-Thomson coefficient, then

Your answerChoose one option.

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is the mass specific enthalpy,

is the mass specific entropy,

is the pressure,

is the temperature,

is the mass specific heat at constant volume,

is the mass specific heat at constant pressure,

is the coefficient of thermal expansion,

is the mass specific volume,

is the isothermal compressibility, then the partial derivative

Your answerChoose one option.

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is the mass specific volume,

is the mass specific entropy,

is the pressure,

is the temperature, then using Maxwell relations,

Your answerChoose one option.

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For a real gas passing through an insulated throttling valve, the outlet temperature of the gas __________ with respect to the inlet temperature.

Your answerChoose one option.

is always higher

is always lower

may be higher, lower or same

is always same

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The saturation pressure

of a pure liquid is represented by an equation of the form:

, where, A and B are constants, and T is the absolute temperature. For this substance, which of the following expression for specific entropy difference between the saturated vapour and the saturated liquid phase (

) is correct? Note: Subscripts

and

refer to saturated liquid and saturated vapour phases, respectively, and

is the specific volume difference between the saturated vapour and the saturated liquid phases.

Your answerChoose one option.

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Saturation pressure of water at 5 °C is 0.8725 kPa. If the latent heat of vaporization is 2489.1 kJ/kg and gas constant is 0.4615 kJ/kg.K, then the saturation pressure at 10 °C (in kPa) (rounded off to 2 decimal places) is ________.

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GATE XE topic:thermodynamic-relations PYQs

Question 100

Question 109

Question 88

Question 97

Question 98

Question 4

Question 5

Question 7

Question 10

Question 19