chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 16

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 Review each marked answer and report any item that may be outdated or unclear.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

301. Van Laar equation deals with the activity co-efficients in___________________?
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A. Azeotropic mixture only

B. None of these

C. Ternary solutions

D. Binary solutions

302. The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the _____________ equation?
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A. Gibbs-Duhem

B. Margules

C. Gibbs-Helmholtz

D. Van Laar

303. When pressure is applied on the system, ice ? water, then_________________?
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A. More water will be formed

B. Equilibrium cannot be established

C. More ice will be formed

D. Evaporation of water will take place

304. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ______________ calorimeter is not used for measuring the dryness fraction of steam?
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A. Bucket

B. Bomb

C. Throttling

D. Separating

305. In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of n is_________________?
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A. 0

B. 1

C. 1.66

D. y = 1.44

306. A large iceberg melts at the base, but not at the top, because of the reason that_________________?
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A. All A, B. and C

B. Ice at the base contains impurities which lowers its melting point

C. Due to the high pressure at the base, its melting point reduces

D. The iceberg remains in a warmer condition at the base

307. Which of the following is a thermodynamic property of a system ?
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A. Mass

B. Entropy

C. Temperature

D. Concentration

308. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is__________________?
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A. More in vapour phase

B. More in liquid phase

C. Same in both the phases

D. Replaced by chemical potential which is more in vapour phase

309. Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be_________________?
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A. 2

B. 1

C. 0

D. 3

310. Entropy change in case of reversible adiabatic process is________________?
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A. Indeterminate

B. Maximum

C. Minimum

D. Zero

311. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the __________________?
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A. Second law of thermodynamics

B. Nernst heat theorem

C. Maxwells relations

D. Third law of thermodynamics

312. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?
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A. Superheated vapour

B. Saturated vapour

C. Partially condensed vapour with quality of 0.9

D. Partially condensed vapour with quality of 0.1

313. To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (?HV/R) (1/T1 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?
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A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Heat of vaporisation is independent of temperature

C. Vapour phase behaves as an ideal gas

D. All A , B. & C.

314. Internal energy is equal to the heat absorbed in case of a/an ______________ process?
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A. Adiabatic

B. Constant volume

C. Polytropic

D. Constant pressure

315. The internal energy of an incompressible fluid depends upon its_________________?
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A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

316. A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature?
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A. Less than

B. More than

C. Equal to or higher than

D. Less than or equal to

317. Heat is added at constant temperature in an ideal ______________ cycle?
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A. None of these

B. Stirling

C. Rankine

D. Brayton

318. The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.K are________________?
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A. 0.66 & 1.987

B. 5 & 3

C. 1.987 & 0.66

D. 3.987 & 1.987

319. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ?
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A. Arithmetic

B. Harmonic

C. Logarithmic

D. Geometric

320. In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is_______________?
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A. Less

B. Same

C. Unpredictable; depends on the particular reaction

D. More

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