chemical engineering MCQs – Page 425

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 Review each marked answer and report any item that may be outdated or unclear.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
8481. Kinetic theory of gases stipulates that, the____________________?
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A. Molecules possess appreciable volume

B. Energy is lost during molecular collisions

C. None of these

D. Absolute temperature is a measure of the kinetic energy of molecules
8482. In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?
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A. Isothermal

B. None of these

C. Adiabatic

D. Reversible

8483. The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only?
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A. Pressure

B. Specific heat

C. Temperature

D. Volume

8484. Entropy is a/an___________________?
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A. State function

B. Extensive property

C. None of these

D. Macroscopic property

8485. Fugacity co-efficient of a substance is the ratio of its fugacity to__________________?
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A. Activity

B. Mole fraction

C. Activity co-efficient

D. Pressure
8486. The vapor pressure of water at 100C is__________________?
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A. 760 mm wc

B. 100 N/m2

C. 13.6 cms of Hg

D. 76 cms of Hg
8487. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?
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A. Decrease

B. Remain same

C. Increase in summer and will decrease in winter

D. Increase
8488. is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ?
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A. . The amount of work needed is path dependent

B. The amount of work needed is independent of path

C. work needed

D. Work alone cannot bring out such a change of state

E. More information is needed to conclude anything about the path dependence or otherwise of

8489. An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to_________________?
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A. 3 P1V1

B. 12 P1V1

C. 6 P1 V1

D. P1 V1

8490. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?
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A. Critical

B. Inversion

C. Boyle

D. Reduced

8491. In an irreversible process________________?
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A. Tds dT + dW < 0

B. Tds = dE dW = 0

C. Tds dE + dW < 0

D. dE dW Tds = 0

8492. Clausius-Clapeyron Equation gives accurate result, when the __________________?
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A. Volume in the liquid state is negligible compared with that in the vapour state

B. Vapour pressure is relatively low and the temperature does not vary over wide limits

C. All A, B. and C

D. Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

8493. Joule-Thomson experiment is__________________?
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A. Isobaric

B. Adiabatic

C. Isenthalpic

D. Both B. & C.
8494. A closed system is cooled reversibly from 100C to 50C. If no work is done on the system________________?
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A. its internal energy (U) decreases and its entropy (S) increases

B. U and S both decreases

C. U decreases but S is constant

D. U is constant but S decreases

8495. Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?
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A. Less than

B. Same as

C. More than

D. Half

8496. _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?
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A. First

B. Zeroth

C. Second

D. Third

8497. For a constant pressure reversible process, the enthalpy change (?H) of the system is___________________?
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A. Cp.dT

B. ? Cv.dT

C. ? Cp.dT

D. Cv.dT

8498. In the ammonia synthesis reaction, N2 + 3H2 ? 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by___________________?
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A. High temperature

B. Low pressure

C. Low temperature only

D. Both low temperature and high pressure
8499. The thermodynamic law, PVy = constant, is not applicable in case of______________?
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A. Free expansion of an ideal gas

B. Adiabatic compression of a perfect gas

C. Ideal compression of air

D. Adiabatic expansion of steam in a turbine

8500. Which of the following gravity scales is used exclusively for liquids heavier than water ?
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A. Twaddell scale

B. API scale

C. None of these

D. Baume scale