chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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
121. Chemical potential of ith component of a system is given by________________?
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A. ?i = (?A/?ni)T, P, ni

B. ?i = (?F/?ni)T, P, ni

C. ?i = (?F/?ni)T, P

D. ?i = (?A/?ni)T, P

122. Gibbs free energy of mixing at constant pressure and temperature is always__________________?
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A. ve

B. 0

C. #NAME?

D. ?

123. During adiabatic expansion of gas___________________?
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A. Pressure remains constant

B. Temperature remains constant

C. None of these

D. Pressure is increased

124. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?
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A. (T1 T2)/T1

B. (T1 T2)/T2

C. (T2 T1)/T1

D. (T2 T1)/T2
125. 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 P

B. T, P and Z

C. T

D. T and Z

126. For an isothermal process, the internal energy of a gas____________________?
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A. Increases

B. Decreases

C. Remains unchanged

D. Data insufficient, cant be predicted

127. The equation relating E, P, V and T which is true for all substances under all conditions is given by (?E/?V)T = T(?P/?T)H P. This equation is called the ___________________?
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A. Thermodynamic equation of state

B. Equation of state

C. Redlich-Kwong equation of state

D. Maxwells equation

128. 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. 3KT/m

B. ?(2KT/m)

C. ?(3KT/m)

D. ?(6KT/m)

129. All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure?
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A. Air

B. Hydrogen

C. Nitrogen

D. Oxygen

130. Gibbs free energy per mole for a pure substance is equal to the__________________?
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A. Molal boiling point

B. Chemical potential

C. Latent heat of vaporisation

D. Heat capacity

131. A Carnot cycle consists of the following steps ?
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A. Two isochoric and two isobaric

B. Two isobaric and two isothermal

C. Two isothermal and two isentropic

D. Two isothermals and two isochoric

132. 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. Gibbs-Duhem

B. Gibbs-Duhem-Margules

C. Margules

D. Van Laar

133. Fugacity and pressure are numerically equal, when the gas is____________________?
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A. At high pressure

B. In standard state

C. In ideal state

D. At low temperature

134. Which one is true for a throttling process ?
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A. A gas may have more than one inversion temperatures

B. The inversion temperature is same for all gases

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

D. The inversion temperature is different for different gases
135. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible ______________ process?
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A. Isometric

B. Isobaric

C. Isothermal

D. Isentropic

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

B. None of these

C. Solubility

D. Temperature

137. For an exothermic reaction ____________________?
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A. Only enthalpy change (?H) is negative

B. Only internal energy change (?E) is negative

C. Both ?H and ?E are negative

D. Enthalpy change is zero

138. Dry ice is________________?
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A. None of these

B. Solid helium

C. Moisture free ice

D. Solid carbon dioxide
139. Melting of ice exemplifies a/an______________________?
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A. Adiabatic process

B. Endothermic reaction

C. Exothermic reaction

D. Process involving a chemical reaction

140. When a gas is subjected to adiabatic expansion, it gets cooled due to__________________?
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A. Energy spent in doing work

B. Decrease in kinetic energy

C. Decrease in temperature

D. Decrease in velocity