chemical engineering MCQs – Page 402

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8021. The third law of thermodynamics states that the__________________?
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A. Gases having same reduced properties behaves similarly

B. Heat capacity of a crystalline solid is zero at absolute zero temperature

C. None of these

D. Heat transfer from low temperature to high temperature source is not possible without external

E. k

8022. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible ____________ process?
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A. Isentropic

B. Isometric

C. Polytropic

D. Isobaric

8023. Which of the following is true for Virial equation of state ?
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A. For some gases, Virial equations and ideal gas equations are the same

B. Virial co-efficients are universal constants

C. Virial co-efficients are function of temperature only

D. Virial co-efficients B represents three body interactions

8024. For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?
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A. Entropy

B. All (A), B. & (C)

C. Internal energy

D. Enthalpy
8025. The internal energy of an ideal gas is a function of its _____________ only?
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A. Temperature

B. Pressure

C. Volume

D. Molecular size

8026. At normal boiling point, molar entropy of vaporisation is _____________ Joule/K.mole?
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A. 192

B. 72

C. 92

D. 142

8027. For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the _______________ of each component must be same in all phases?
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A. Chemical potential

B. Fugacity

C. Both A. and B

D. Neither A. nor B

8028. 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 and temperature must be kept below 5.2 atm. and 57C respectively

B. Temperature must be kept above 57C

C. Pressure must be kept below 5.2 atm

D. Pressure must be kept below 5.2 atm. and temperature must be kept above 57C

8029. Standard temperature and pressure (S.T.P.) is__________________?
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A. 0C and 1 kgf/cm2

B. 15C and 1 kgf/cm2

C. 0C and 750 mm Hg

D. 15C and 750 mm Hg

8030. For a spontaneous process, free energy__________________?
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A. Is zero

B. Increases

C. Decreases whereas the entropy increases

D. And entropy both decrease

8031. The expression for entropy change given by, ?S = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?
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A. Simultaneous heating and expansion of an ideal gas

B. Heating of a substance

C. Cooling of a substance

D. Reversible isothermal volume change

8032. The intensive properties are_____________?
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A. Molar volume, density, viscosity and boiling point

B. Refractive index and surface tension

C. Both A. and B

D. None of these

8033. Refrigeration cycle_________________?
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A. Violates second law of thermodynamics

B. Involves transfer of heat from low temperature to high temperature

C. Both A. and B

D. Neither A. nor B

8034. When dilute aqueous solutions of two salts are mixed, the process is associated with ___________________?
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A. Decrease in temperature

B. No change in temperature

C. Increase in temperature

D. Change in temperature which is a function of composition

8035. Which of the following identities can be most easily used to verify steam table data for superheated steam ?
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A. (?T/?P)S = (?V/?S)P

B. (?T/?V)S = (?p/?S)V

C. (?P/?T)V = (?S/?V)T

D. (?V/?T)P = -(?S/?P)T
8036. Fugacity and pressure are numerically not equal for the gases__________________?
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A. At low temperature and high pressure

B. At standard state

C. Both A. and B

D. In ideal state

8037. Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?
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A. Maximum

B. ?

C. Minimum

D. 0

8038. Which of the following is not an extensive property ?
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A. Free energy

B. Refractive index

C. None of these

D. Entropy

8039. Which of the following is not an intensive property ?
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A. Molar heat capacity

B. Internal energy

C. Viscosity

D. None of these

8040. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible ______________ process?
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A. Isentropic

B. Isothermal

C. Isometric

D. Isobaric