Chemical Engineering Thermodynamics

101. Critical compressibility factor for all substances

1. Are more or less constant (vary from 0.2 to 0.3)
2. Vary as square of the absolute temperature
3. Vary as square of the absolute pressure
4. None of these

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102. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

1. A homogeneous solution (say of phenol water) is formed
2. Mutual solubility of the two liquids shows a decreasing trend
3. Two liquids are completely separated into two layers
4. None of these

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103. Critical temperature is defined as the temperature above which a gas will

1. Not liquify (barring exceptions)
2. Immediately liquify
3. Never liquify however high the pressure may be
4. None of these

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104. Cv for an ideal gas

1. Does not depend upon temperature
2. Is independent of pressure only
3. Is independent of volume only
4. Is independent of both pressure and volume

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105. Cv is given by

1. (∂E/∂T)V
2. (∂E/∂V)T
3. (∂E/∂P)V
4. (∂V/∂T)P

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106. Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH3 will be

1. 0
2. 1
3. 2
4. 3

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107. Degree of freedom of the system ice-water-vapour will be

1. 0
2. 1
3. 2
4. 3

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108. Degrees of freedom at triple point will be

1. 0
2. 1
3. 2
4. 3

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109. Domestic refrigerator usually works on the _________ refrigeration cycle.

1. Carnot
2. Air
3. Absorption
4. vapour-ejection

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110. Dry ice is

1. Moisture free ice
2. Solid helium
3. Solid carbon dioxide
4. None of these

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