chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 5

Practise multiple-choice questions from chemical engineering thermodynamics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering thermodynamics for chemical chemical engineering Mcqs
81. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is 57C and 5.2 atm) ?
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A. Pressure must be kept below 5.2 atm. and temperature must be kept above 57C

B. Temperature must be kept above 57C

C. Pressure must be kept below 5.2 atm

D. Pressure and temperature must be kept below 5.2 atm. and 57C respectively
82. Enthalpy changes over a constant pressure path are always zero for ______________ gas?
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A. A real

B. An easily liquefiable

C. A perfect

D. Any

83. A gas has a volume of 27.3 c.c. at 0C. Its volume at 10C (if pressure remains unchanged) will be _____________ c.c?
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A. 283

B. 273

C. 2.73

D. 28.3
84. The most important application of distribution law is in_____________________?
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A. Liquid extraction

B. Distillation

C. Drying

D. Evaporation

85. Entropy, which is a measure of the disorder of a system, is__________________?
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A. All A, B. & C

B. Zero at absolute zero temperature for a perfect crystalline substance

C. Independent of temperature

D. Independent of pressure

86. While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?
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A. Infinity

B. Unity

C. Negative

D. Constant
87. Air-refrigeration cycle________________?
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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
88. The internal energy of an ideal gas is a function of its _____________ only?
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A. Molecular size

B. Volume

C. Pressure

D. Temperature
89. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?
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A. Two temperatures only

B. Pressure of working fluid

C. Mass of the working fluid

D. Mass and pressure both of the working fluid

90. For an isothermal reversible compression of an ideal gas_______________?
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A. Only ?E = 0

B. dQ = dE

C. Only ?H =0

D. ?E = ?H = 0
91. ____________ explains the equilibrium constant for any chemical reaction?
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A. Henrys law

B. Hesss law

C. None of these

D. Law of mass action
92. What is the ratio of adiabatic compressibility to isothermal compressibility ?
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A. > 1

B. < 1

C. >> 1

D. 1

93. Absolute zero temperature signifies the ____________________?
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A. None of these

B. Temperature of the heat reservoir to which a Carnot engine rejects no heat

C. Minimum temperature attainable

D. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in

94. Pick out the wrong statement_________________?
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A. Phase rule variables are intensive properties

B. Heat and work are both state function

C. The work done by expansion of a gas in vacuum is zero

D. CP and CV are state function

95. A domestic refrigerator has a/an ____________ cooled condenser?
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A. Evaporative

B. Air

C. Gas

D. Water

96. Sublimation temperature of dry ice (solid CO2) is ____________ C?
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A. -273

B. -78

C. 5

D. 0

97. Ideal gas law is applicable at____________________?
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A. Low T, high P

B. Low T, low P

C. High T, high P

D. High T, low P
98. Pick out the wrong statement. A. The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction________________?
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A. The equilibrium constant of a reaction depends upon temperature only

B. rease in volume accompanying the reaction

C. With increase in temperature, the equilibrium constant increases for an exothermic reaction

D. The conversion for a gas phase reaction increases with increase in pressure, if there is a

99. Lenzs law results from the law of conservation of___________________?
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A. Mass

B. Energy

C. None of these

D. Momentum

100. During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?
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A. ?

B. #NAME?

C. +ve

D. 0