chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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
141. Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?
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A. Activity co-efficient

B. Partial pressure

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

D. Fugacity

142. Internal energy of an ideal gas___________________?
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A. Decreases with increase in temperature

B. Increases with increase in pressure

C. Is independent of temperature

D. None of these
143. An isolated system can exchange ______________ with its surroundings?
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A. Matter

B. Energy

C. Neither matter nor energy

D. Both matter and energy

144. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process?
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A. Polytropic

B. Isobaric

C. Isothermal

D. Adiabatic

145. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?
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A. 300 (333/7)

B. 300 (35/7)

C. 300 (33/5)

D. 300 (32/7)
146. Reduced pressure of a gas is the ratio of its__________________?
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A. Pressure to critical pressure

B. Critical pressure to pressure

C. Pseudocritical pressure to pressure

D. Pressure to pseudocritical pressure

147. For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ? C2H5OH(g), the equilibrium conversion does not depend on the________________?
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A. Steam to ethylene ratio

B. None of these

C. Temperature

D. Pressure

148. Melting of wax is accompanied with ______________ in entropy?
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A. None of these

B. Decrease

C. No change

D. Increase
149. In Joule-Thomson porous plug experiment, the__________________?
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A. Enthalpy does not remain constant

B. Entire apparatus is exposed to surroundings

C. Temperature remains constant

D. None of these
150. For a cyclic process, a fixed ratio between heat and work___________________?
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A. May exist

B. Never exists

C. Always exists

D. Is difficult to predict

151. Third law of thermodynamics is concerned with the__________________?
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A. Direction of energy transfer

B. Value of absolute entropy

C. Energy transfer

D. None of these

152. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ? PCl3 + Cl2.Degree of dissociation of PCl5 will_________________?
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A. Decrease on increasing the pressure of the system

B. None of these

C. Decrease on addition of Cl2

D. Increase on addition of an inert gas at constant pressure

153. A system in which there is exchange of energy but not of mass, is called a/an ____________ system?
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A. Open

B. Isolated

C. Closed

D. Insulated

154. Degree of freedom of the system ice-water-vapour will be ________________?
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A. 1

B. 0

C. 3

D. 2

155. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be _______________?
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A. Same

B. Data insufficient to predict

C. Less

D. More
156. The amount of heat required to decompose a compound into its elements is _____________ the heat of formation of that compound from its elements?
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A. Same as

B. Less than

C. Not related to

D. More than

157. Which of the following processes cannot be made reversible even under ideal condition of operation ?
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A. Free expansion of a gas

B. All (A), B. & (C)

C. Compression of air in a compressor

D. Expansion of steam in a turbine

158. Which of the following identities can be most easily used to verify steam table data for superheated steam ?
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A. (?T/?V)S = (?p/?S)V

B. (?T/?P)S = (?V/?S)P

C. (?V/?T)P = -(?S/?P)T

D. (?P/?T)V = (?S/?V)T

159. At normal boiling point, molar entropy of vaporisation is _____________ Joule/K.mole?
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A. 192

B. 72

C. 92

D. 142

160. Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?
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A. Maximum

B. Minimum

C. 0

D. ?