chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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

381. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________________?
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A. C = P F + 2

B. P + F C = 2

C. P = F C 2

D. F = C P 2

382. A system is said to be at equilibrium, if the entropy of the system has reached ____________ value?
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A. Zero

B. Maximum

C. Minimum

D. None of these

383. What happens in a reversible adiabatic expansion process ?
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A. Cooling takes place

B. Heating takes place

C. Temperature is constant

D. Pressure is constant

384. Cv for an ideal gas__________________?
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A. Does not depend upon temperature

B. Is independent of pressure only

C. Is independent of volume only

D. Is independent of both pressure and volume

385. Isobaric process means a constant process ?
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A. Temperature

B. Entropy

C. Volume

D. Pressure

386. Cp of a gas at its critical temperature and pressure_______________?
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A. Becomes infinity

B. Equals 0.24 kcal/kmol K

C. Becomes zero

D. Equals 1 kcal/kmol K

387. Rotary lime kiln is an example of a/an _____________ system?
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A. Isolated

B. Closed

C. Open

D. Non-thermodynamic

388. Pick out the undesirable property for a good refrigerant ?
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A. Low freezing point

B. High viscosity

C. High thermal conductivity

D. Large latent heat of vaporisation

389. For an ideal gas, the activity co-efficient is_________________?
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A. None of these

B. Directly proportional to pressure

C. Unity at all pressures

D. Inversely proportional to pressure

390. If atmospheric temperature and dew point are nearly equal, then the relative humidity is_______________?
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A. Zero

B. Almost 100%

C. unpredictable

D. 50%

391. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is__________________?
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A. Less

B. Dependent on climatic conditions

C. More

D. Same

392. If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the _________________?
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A. Nernst Heat Theorem

B. Clausius-Clapeyron Equation

C. Van Laar equation

D. Maxwells equation

393. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____________ as its mole fraction increases?
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A. Decreases linearly

B. Remain same

C. Decreases

D. Increases

394. Fugacity co-efficient of a substance is the ratio of its fugacity to__________________?
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A. Pressure

B. Activity co-efficient

C. Activity

D. Mole fraction

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

B. Dilution

C. Formation

D. Combustion

396. High _____________ is an undesirable property for a good refrigerant?
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A. Viscosity

B. Specific heat

C. Latent heat of vaporisation

D. Specific vapor volume

397. Which of the following is not an intensive property ?
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A. Internal energy

B. None of these

C. Viscosity

D. Molar heat capacity

398. For an irreversible process involving only pressure-volume work____________________?
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A. (dF)T, p > 0

B. (dF)T, p = 0

C. (dA)T, v >0

D. (dF)T, p

399. In an irreversible process________________?
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A. dE dW Tds = 0

B. Tds dE + dW < 0

C. Tds dT + dW < 0

D. Tds = dE dW = 0

400. Internal energy change of a system over one complete cycle in a cyclic process is__________________?
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A. #NAME?

B. Zero

C. #NAME?

D. Dependent on the path

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