chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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
181. The work done in isothermal compression compared to that in adiabatic compression will be__________________?
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A. More

B. Same

C. More or less depending upon the extent of work done

D. Less

182. Entropy of a substance remains constant during a/an ____________ change?
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A. None of these

B. Reversible isothermal

C. Irreversible isothermal

D. Reversible adiabatic
183. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?
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A. Work

B. Temperature

C. Kinematic viscosity

D. None of these
184. Which of the following has the least thermal efficiency ?
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A. Otto engine

B. Diesel engine

C. Steam engine

D. Carnot engine

185. 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. Infinity

D. None of these

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

B. 273C

C. -273C

D. 100C

187. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (?) is given by (where, ? = standard chemical potential at unit fugacity (f = 1 atm.) and the gas behaves ideally.) ?
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A. ?+ R ln f

B. ? + R/T ln f

C. ? + T ln f

D. ? + RT ln f
188. The equation DU = Tds PdV is applicable to infinitesimal changes occuring in_________________?
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A. An open system of constant composition

B. A closed system with changes in composition

C. An open system with changes in composition

D. A closed system of constant composition

189. Linde gas liquefaction process employs cooling ____________________?
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A. None of these

B. At constant pressure

C. By expansion in an engine

D. By throttling
190. For a constant volume process_________________?
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A. dW = pdV

B. dQ = dE + pdV

C. dE = CvdT

D. dE = CpdT

191. In any spontaneous process, the ______________ free energy decreases ?
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A. Helmholtz

B. Gibbs

C. Both A. & B.

D. Neither A. nor B.

192. The expression for entropy change given by, ?S = nR ln (P2/P1), holds good for___________________?
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A. Reversible isothermal volume change

B. Cooling of a real gas

C. Heating of an ideal gas

D. Expansion of a real gas

193. Troutons ratio is given by (where ?b, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, K) ___________________?
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A. ?(Tb/?b)

B. ?(?b/Tb)

C. Tb/?b

D. ?b/Tb
194. Which of the following behaves most closely like an ideal gas ?
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A. He

B. H2

C. O2

D. N2

195. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to__________________?
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A. Unity

B. Activity

C. Both A. & B

D. Neither A. nor B

196. Which of the following is true for Virial equation of state ?
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A. For some gases, Virial equations and ideal gas equations are the same

B. Virial co-efficients are function of temperature only

C. Virial co-efficients B represents three body interactions

D. Virial co-efficients are universal constants

197. 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
198. (?E/?T)V is the mathematical expression for____________________?
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A. None of these

B. Free energy change

C. CV

D. Enthalpy change

199. In case of a close thermodynamic system, there is ______________ across the boundaries?
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A. No heat and mass transfer

B. Mass and energy transfer

C. No mass transfer but heat transfer

D. None of these

200. 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. Is the analog of linear frictionless motion in machines

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