Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering Page-12 section-1

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111.
Claude gas liquefaction process employs cooling

A. At constant pressure

B. By throttling

C. By expansion in an engine

D. None of these

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112.
Air-refrigeration cycle

A. Is the most efficient of all refrigeration cycles

B. Has very low efficiency

C. Requires relatively large quantities of air to achieve a significant amount of refrigeration

D. Both B and C

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113.
The quantitative effect of temperature on chemical equilibrium is given by the

A. Vant-Hoff equation

B. Le-Chatelier's principle

C. Arhenius equation

D. None of these

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114.
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.

A. Gibbs-Duhem

B. Van Laar

C. Gibbs-Helmholtz

D. Margules

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Answer & Solution

Answer: Option A

Solution:

The gibbs duhem equation is an equation that relates the partial modal properties of different species in the solution with composition at constant temperature and pressure and the equation is given by :
Writing the gibbs duhem equation in terms of partial gibbs free energy :

$$\sum\nolimits_{i\, = \,1}^n {} {x_i}d{\overrightarrow G _i} = 0$$

Since

d \overset{⇀}{G_{l}} = R T d l n ({\overset{⌢}{f}}_{i})

We can write \[\sum\nolimits_{i\,=\,1}^{n}{{}}{{x}_{i}}d{{\left( ln\overset\frown{f} \right)}_{i}}=0\]
So, by gibbs duhem equation the composition and fugacity are related.

115.
Enthalpy of a gas depends upon its

A. Temperature

B. Mass

C. Volume

D. Pressure

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116.
The Joule-Thomson co-efficient is defined as $${\left( {\frac{{\partial {\text{T}}}}{{\partial {\text{P}}}}} \right)_{\text{H}}}.$$ Its value at the inversion point is

A. $$\infty $$

B. 1

C. 0

D. -ve

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117.
The compressibility factor for an ideal gas is 1. Its value for any other real gas is

A. 1

B. < 1

C. > 1

D. Either (b) or (c), depends on the nature of the gas

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118.
Pick out the correct statement.

A. A real gas on expansion in vacuum gets heated up

B. An ideal gas on expansion in vacuum gets cooled

C. An ideal gas on expansion in vacuum gets heated up

D. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

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119.
An irreversible process

A. Is the analog of linear frictionless motion in machines

B. Is an idealised visualisation of behaviour of a system

C. Yields the maximum amount of work

D. Yields an amount of work less than that of a reversible process

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120.
Solid and liquid phases of a substance are in equilibrium at the

A. Critical temperature

B. Melting point

C. Freezing point

D. Both B and C

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Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

111. Claude gas liquefaction process employs cooling

Answer & Solution

112. Air-refrigeration cycle

Answer & Solution

113. The quantitative effect of temperature on chemical equilibrium is given by the

Answer & Solution

114. The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.

Answer & Solution

115. Enthalpy of a gas depends upon its

Answer & Solution

116. The Joule-Thomson co-efficient is defined as $${\left( {\frac{{\partial {\text{T}}}}{{\partial {\text{P}}}}} \right)_{\text{H}}}.$$ Its value at the inversion point is

Answer & Solution

117. The compressibility factor for an ideal gas is 1. Its value for any other real gas is

Answer & Solution

118. Pick out the correct statement.

Answer & Solution

119. An irreversible process

Answer & Solution

120. Solid and liquid phases of a substance are in equilibrium at the

Answer & Solution

Read More Section(Chemical Engineering Thermodynamics)

111.
Claude gas liquefaction process employs cooling

112.
Air-refrigeration cycle

113.
The quantitative effect of temperature on chemical equilibrium is given by the

114.
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.

115.
Enthalpy of a gas depends upon its

116.
The Joule-Thomson co-efficient is defined as $${\left( {\frac{{\partial {\text{T}}}}{{\partial {\text{P}}}}} \right)_{\text{H}}}.$$ Its value at the inversion point is

117.
The compressibility factor for an ideal gas is 1. Its value for any other real gas is

118.
Pick out the correct statement.

119.
An irreversible process

120.
Solid and liquid phases of a substance are in equilibrium at the