chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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
161. The first law of thermodynamics is a statement of conservation of_____________________?
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A. Energy

B. Heat

C. Momentum

D. Work

162. During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
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A. 0

B. #NAME?

C. ?

D. +ve
163. In a working refrigerator, the value of COP is always__________________?
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A. 0

B. < 0

C. < 1

D. > 1
164. The necessary and sufficient condition for equilibrium between two phases is_________________?
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A. The temperature of each phase should be same

B. The pressure should be same in the two phases

C. The concentration of each component should be same in the two phases

D. The chemical potential of each component should be same in the two phases
165. Degrees of freedom at triple point will be______________?
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A. 0

B. 2

C. 3

D. 1

166. Out of the following refrigeration cycles, which one has maximum COP ?
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A. Ordinary vapor compression cycle

B. Vapor compression with a reversible expansion engine

C. Air cycle

D. Carnot cycle
167. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?
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A. H2

B. O2

C. N2

D. CO2

168. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?
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A. T2/(T1-T2)

B. T1/T2

C. T2/R1

D. T1/(T1-T2)
169. In an ideal gas mixture, fugacity of a species is equal to its___________________?
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A. Chemical potential

B. None of these

C. Partial pressure

D. Vapor pressure

170. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, ? S1 and ? SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?
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A. ? S1 is always ? SR

B. ? S1 is always > ? SR

C. ? S1 is always = ? SR

171. In a reversible process__________________?
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A. dE dW = Tds

B. Tds dW + dE >0

C. Tds = dE + dW

D. dW dE = Tds

172. An isentropic process is carried out at constant____________________?
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A. Volume

B. Pressure

C. Temperature

D. All (A), B. and (C)

173. In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc ?
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A. N2O4 ? 2NO2

B. None of these

C. 2HI ? H2 + I2

D. 2SO2 + O2 ? 2SO3

174. Joule-Thomson Co-efficient at any point on the inversion curve is___________________?
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A. #NAME?

B. #NAME?

C. 0

D. ?

175. Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature ____________ as its mole fraction increases?
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A. Remain constant

B. Increases

C. Decreases exponentially

D. Decreases

176. _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?
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A. Zeroth

B. Third

C. First

D. Second
177. Which of the following is not a unit of the equilibrium constant Kp? (where, ?x = number of moles of products number of moles of reactants) ?
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A. (atm)?x, when ?x is negative

B. Dimensionless, when ?x = 0

C. (atm)?x, when ?x is positive

D. (atm)?x2, when ?x > 0
178. Helmholtz free energy A. is defined as____________________?
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A. A = H TS

B. A = H + TS

C. A = E TS

D. None of these

179. As the temperature is lowered towards the absolute zero, the value of ?(?F)/?T, then approaches_______________________?
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A. Unity

B. That of the heat of reaction

C. Zero

D. Infinity

180. A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
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A. It is exothermic

B. It takes place at constant volume

C. It takes place isothermally

D. It is isenthalpic