chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 24

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 Review each marked answer and report any item that may be outdated or unclear.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
461. Which of the following is not an equation of state ?
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A. Bertholet equation

B. Clausius-Clapeyron equation

C. None of these

D. Beattie-Bridgeman equation

462. Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?
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A. Heat of reaction

B. Heat of combustion

C. Heat of formation

D. Calorific value

463. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________?
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A. 0

B. 2

C. 3

D. 1

464. Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?
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A. dQ = CpdT + Vdp

B. dE = Tds PdV

C. dQ = CvdT + PdV

D. Tds = dE PdV

465. The chemical potential for a pure substance is ____________ its partial molal free energy?
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A. Less than

B. Equal to

C. More than

D. Not related to

466. Partial molar free energy of an element A in solution is same as its__________________?
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A. Fugacity

B. Chemical potential

C. Activity co-efficient

D. Activity

467. Pick out the correct statement?
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A. The available energy in an isolated system for all irreversible (real) processes decreases

B. nge in Helmholtz free energy

C. All A, B. and C

D. The efficiency of a Carnot engine increases, if the sink temperature is decreased

E. The reversible work for compression in non-flow process under isothermal condition is the

468. Pick out the extensive property out of the following ?
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A. Free energy

B. Surface tension

C. Refractive index

D. Specific heat

469. A system is said to be isopiestic, if there is no ______________ change?
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A. Volume

B. Pressure

C. Temperature

D. None of these

470. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?
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A. Cp > Cv

B. Cp = Cv

C. C ? Cv

D. Cp < Cv

471. Pick out the wrong statement?
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A. An equation relating pressure, volume and temperature of a gas is called ideal gas equation

B. Troutons ratio of non-polar liquids is calculated using Kistyakowsky equation

C. Thermal efficiency of a Carnot engine is always less than 1

D. None of these

472. Which of the following is not correct for a reversible adiabatic process ?
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A. None of these

B. PV? = constant

C. TV?-1 = constant

D. p1-?.TY = constant

473. Entropy of the system decreases, when_______________?
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A. Snow melts into water

B. A gas expands spontaneously from high pressure to low pressure

C. Water is converted into ice

D. Both B. & C
474. Pick out the correct statement ?
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A. In an isothermal system, irreversible work is more than reversible work

B. Matter and energy cannot be exchanged with the surroundings in a closed system

C. Under reversible conditions, the adiabatic work is less than isothermal work

D. Heat, work, enthalpy and entropy are all state functions

475. Claude gas liquefaction process employs cooling___________________?
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A. By expansion in an engine

B. None of these

C. At constant pressure

D. By throttling

476. Which is not a refrigerant ?
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A. NH3

B. CCl2F2

C. SO2

D. C2H4Cl2
477. The activity of an ideal gas is numerically ____________ its pressure?
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A. Data insufficient, cant be predicted

B. More than

C. Less than

D. Equal to
478. What is the value of ln y (where y = activity co-efficient) for ideal gases ?
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A. Unity

B. Zero

C. Infinity

D. Negative

479. After throttling, gas temperature___________________?
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A. Increases

B. Remain same

C. May increase or decrease; depends on the nature of the gas

D. Decreases
480. Boiling of liquid is accompanied with increase in the__________________?
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A. Specific entropy

B. Vapor pressure

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

D. Specific Gibbs free energy