chemical engineering MCQs – Page 421

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 Review each marked answer and report any item that may be outdated or unclear.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

8401. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?
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A. Increases with pressure rise

B. Decreases with increasing pressure

C. Becomes zero at the critical point

D. Both B. & C.

8402. For a real gas, the chemical potential is given by_____________________?
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A. None of these

B. R d ln f

C. RT d ln P

D. RT d ln f

8403. Boyles law for gases states that____________________?
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A. P ? 1/V, when temperature is constant

B. P ? V, at constant temperature & mass of the gas

C. P ? 1/V, when temperature & mass of the gas remain constant

D. P/V = constant, for any gas

8404. The internal energy of an ideal gas does not change in a reversible _____________ process?
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A. Isothermal

B. Isobaric

C. Adiabatic

D. Isometric

8405. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ?H = 394 kJ/kg .mole CO + O2 = CO2, ?H = 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?
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A. 180

B. 109.5

C. 100

D. -109.5

8406. Free energy___________________?
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A. Decreases in all spontaneous (or irreversible) processes

B. Change during a spontaneous process has a negative value

C. All A, B. and C

D. Remains unchanged in reversible processes carried at constant temperature and pressure

8407. With increase in temperature, the internal energy of a substance___________________?
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A. Increases

B. Decreases

C. Remains unchanged

D. May increase or decrease; depends on the substance

8408. Which of the following represents the Virial equation of state ?
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A. n1u2 + ?2?1 = 0

B. PV/RT = 1 + (B/V) + (C/V2) +

C. T = [RT/(V- b)] [a/?T. V(V + b)]

D. None of these

8409. A system in which there is exchange of energy but not of mass, is called a/an ____________ system?
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A. Isolated

B. Open

C. Insulated

D. Closed

8410. As the temperature is lowered towards the absolute zero, the value of ?(?F)/?T, then approaches_______________________?
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A. Infinity

B. Unity

C. That of the heat of reaction

D. Zero

8411. The amount of heat required to decompose a compound into its elements is _____________ the heat of formation of that compound from its elements?
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A. Less than

B. More than

C. Not related to

D. Same as

8412. The chemical potential for a pure substance is ____________ its partial molal free energy?
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A. More than

B. Less than

C. Not related to

D. Equal to

8413. The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________?
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A. Combustion

B. Dilution

C. Formation

D. Solution

8414. Heat is added at constant pressure in an ideal _____________ cycle?
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A. Stirling

B. Brayton

C. Rankine

D. Both B. and C

8415. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?
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A. +ve

B. ?

C. 0

D. #NAME?

8416. Free energy change at equilibrium is____________________?
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A. Positive

B. Zero

C. Indeterminate

D. Negative

8417. For any system, what is the minimum number of degrees of freedom ?
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A. 2

B. 3

C. 1

D. 0

8418. In any spontaneous process, ?
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A. Only F decreases

B. Only A decreases

C. Both F and A decreases

D. Both F and A increase

8419. Equation which relates pressure, volume and temperature of a gas is called the__________________?
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A. Equation of state

B. Ideal gas equation

C. None of these

D. Gibbs Duhem equation

8420. Which of the following is followed by an ideal solution ?
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A. Raoults law

B. Amagats law

C. Boyles law

D. Troutons rule

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