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

321. The third law of thermodynamics states that the__________________?
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A. Heat transfer from low temperature to high temperature source is not possible without external

B. Gases having same reduced properties behaves similarly

C. k

D. None of these

E. Heat capacity of a crystalline solid is zero at absolute zero temperature
322. The gas law (PV = RT) is true for an ______________ change?
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A. Isothermal

B. Adiabatic

C. Both A. & B

D. Neither A. nor B

323. (?T/?P)H is the mathematical expression for__________________?
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A. Specific heat at constant volume (Cv)

B. Joule-Thompson co-efficient

C. Specific heat at constant pressure (Cp)

D. None of these

324. Which of the following equations is used for the prediction of activity co-efficient from experiments ?
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A. Van Laar equation

B. All A, B. and C

C. Margules equation

D. Wilsons equation

325. Pick out the correct statement?
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A. A process is irreversible as long as ? S for the system is greater than zero

B. The mechanical work done by a system is always equal to?P.dV

C. mation of the compound from its reactants</strong>

D. If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container,

E. temperature of the liquid will increase

F. The heat of formation of a compound is defined as the heat of reaction leading to the
326. Joule-Thomson experiment is__________________?
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A. Isobaric

B. Adiabatic

C. Isenthalpic

D. Both B. & C.
327. Water on heating from 1 to 4C___________________?
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A. Has same volume

B. Expands

C. May contract or expand

D. Contracts
328. With increase in temperature, the atomic heat capacities of all solid elements_________________?
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A. Remains unchanged

B. Decreases linearly

C. Increases

D. Decreases

329. If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ?H for the reaction CH4(g) + C2H4(g) ? C3H8(g) will be _____________ Kcal?
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A. 55.2

B. -55.2

C. -30.2

D. -19.4
330. Heating of water under atmospheric pressure is an ______________ process?
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A. Isobaric

B. Isothermal

C. Isochoric

D. Adiabatic

331. Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called ____________ solutions?
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A. Isotonic

B. Real

C. Ideal

D. None of these

332. The extensive properties are____________________?
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A. Volume, mass and number of moles

B. Free energy, entropy and enthalpy

C. Both A. and B

D. None of these

333. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?
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A. Fusion

B. Vaporisation

C. None of these

D. Transition
334. A refrigerator may be termed as a____________________?
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A. None of these

B. Heat engine

C. Heat pump

D. Carnot engine

335. In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________?
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A. Either of the above three; depends on the nature of refrigerant

B. 0

C. #NAME?

D. #NAME?

336. For an ideal liquid solution, which of the following is unity ?
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A. Fugacity co-efficient

B. Activity co-efficient

C. Activity

D. Fugacity

337. An ideal liquid refrigerant should______________________?
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A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils

B. Not have unduly high vapour pressure at the condenser temperature

C. Both A. and B

D. Have low specific heat

338. Boyles law for gases states that____________________?
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A. P ? V, at constant temperature & mass of the gas

B. P ? 1/V, when temperature is constant

C. P/V = constant, for any gas

D. P ? 1/V, when temperature & mass of the gas remain constant
339. Law of corresponding states says that___________________?
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A. No gas can be liquefied above the critical temperature, howsoever high the pressure may be.

B. ories)

C. Two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same

D. The molar heat of energy of gas at constant volume should be nearly constant (about 3

E. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at

F. critical temperature

340. For a constant volume process _____________ by the system is used only to increase the internal energy?
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A. Heat absorbed

B. Work done

C. Both A. & B

D. Neither A. nor B

341. Free energy change of mixing two liquid substances is a function of the__________________?
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A. Quantities of the constituents only

B. Concentration of the constituents only

C. Temperature only

D. All A, B. and C
342. Number of phases in a colloidal system is_____________________?
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A. 3

B. 2

C. 1

D. 4

343. Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is__________________?
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A. 1

B. 2

C. 4

D. 3

344. 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

345. Specific volume of an ideal gas is____________________?
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A. None of these

B. The reciprocal of its density

C. Proportional to pressure

D. Equal to its density

346. The expression for entropy change, ?S = n Cp . ln (T2/T1), is valid for the ______________ of a substance?
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A. Simultaneous pressure & temperature change

B. Heating

C. Cooling

D. Both B. and C
347. dW and dq are not the exact differential, because q and W are__________________?
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A. Intensive properties

B. Extensive properties

C. State functions

D. Path functions
348. Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?
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A. Easier plotting

B. Use of only one graph for all gases

C. Covering of wide range

D. More accurate plotting

349. Compound having large heat of formation is_____________________?
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A. Not at all stable (like nascent O2)

B. More stable

C. Less stable

D. Either more or less stable; depends on the compound

350. For a multi-component system, the term chemical potential is equivalent to the ___________________?
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A. Molal concentration difference

B. Partial molar free energy

C. Molar free energy change

D. Molar free energy