chemical engineering MCQs – Page 408

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 Review each marked answer and report any item that may be outdated or unclear.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

8141. What happens in a reversible adiabatic compression ?
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A. Temperature is constant

B. Cooling occurs

C. Pressure is constant

D. Heating occurs

8142. In a homogeneous solution, the fugacity of a component depends upon the __________________?
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A. All (A), B. and (C)

B. Pressure

C. Composition

D. Temperature

8143. As the temperature is lowered towards the absolute zero, the value of the quantity (??F/?T) approaches________________?
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A. Zero

B. Unity

C. None of these

D. Infinity

8144. For spontaneous changes in an isolated system (S = entropy) ___________________?
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A. ds = 0

B. ds > 0

C. ds <0

D. ds = Constant

8145. Which of the following exemplifies an adiabatic process ?
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A. Evaporation of water

B. Melting of ice

C. Condensation of alcohol vapor

D. Sudden bursting of a cycle tube

8146. Which one is true for a throttling process ?
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A. The inversion temperature is same for all gases

B. A gas may have more than one inversion temperatures

C. The inversion temperature is different for different gases

D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

8147. Which of the following is not a reversible process ?
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A. Solution of NaCl in water at 50C

B. None of these

C. Expansion of an ideal gas against constant pressure

D. Atmospheric pressure vaporisation of water at 100C

8148. The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _____________ equation?
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A. Van Laar

B. Gibbs-Duhem-Margules

C. Gibbs-Duhem

D. Margules

8149. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?
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A. O2

B. H2

C. N2

D. CO2

8150. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?
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A. T and Z

B. T, P and Z

C. T and P

D. T

8151. Throttling process is a/an _____________ process?
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A. Reversible and constant enthalpy

B. Reversible and constant entropy

C. Irreversible and constant enthalpy

D. Reversible and isothermal

8152. Which of the following is not a common refrigerant ?
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A. Ethylene

B. Ammonia

C. Freon-12

D. Carbon dioxide

8153. Normal temperature and pressure (N.T.P.) corresponds to ___________________?
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A. 15C and 760 mm Hg

B. 0C and 760 mm Hg

C. 20C and 760 mm Hg

D. 0C and 1 kgf/cm2

8154. Henrys law is closely obeyed by a gas, when its _____________ is extremely high?
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A. Pressure

B. Temperature

C. Solubility

D. None of these

8155. 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

8156. In case of a close thermodynamic system, there is ______________ across the boundaries?
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A. None of these

B. No mass transfer but heat transfer

C. Mass and energy transfer

D. No heat and mass transfer

8157. Melting of ice is an example of an _____________ process?
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A. None of these

B. Isometric

C. Adiabatic

D. Isothermal

8158. An irreversible process____________________?
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A. Yields the maximum amount of work

B. Is an idealised visualisation of behaviour of a system

C. Yields an amount of work less than that of a reversible process

D. Is the analog of linear frictionless motion in machines

8159. The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann?s constant, T = absolute temperature) ?
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A. ?(6KT/m)

B. 3KT/m

C. ?(3KT/m)

D. ?(2KT/m)

8160. The kinetic energy of gas molecule is zero at_____________________?
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A. 0C

B. 100C

C. 273C

D. -273C

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