chemical engineering thermodynamics for chemical chemical engineering Mcqs
101. One ton of refrigeration capacity is equivalent to the heat removal rate of____________________?
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A. 200 BTU/minute

B. 200 BTU/hr

C. 50 kcal/hr

D. 200 BTU/day

102. Refrigerants commonly used for domestic refrigerators are_________________?
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A. Ethyl chloride or methyl chloride

B. Freon-12

C. NH3 or CO2

D. Propane

103. What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
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A. 2

B. 3

C. 0

D. 1
104. Standard temperature and pressure (S.T.P.) is__________________?
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A. 0C and 750 mm Hg

B. 0C and 1 kgf/cm2

C. 15C and 750 mm Hg

D. 15C and 1 kgf/cm2

105. Work done in case of free expansion is____________________?
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A. Zero

B. Negative

C. None of these

D. Indeterminate

106. For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?
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A. Internal energy

B. Entropy

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

D. Enthalpy
107. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the_______________?
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A. Kopps rule

B. Law of corresponding state

C. Arrhenius hypothesis

D. Le-Chatelier principle
108. In the reaction; N2 + O2 ? 2NO, increasing the pressure will result in_________________?
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A. Shifting the equilibrium towards left

B. Shifting the equilibrium towards right

C. None of these

D. No change in equilibrium condition
109. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ? CO2 + H2, by_________________?
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A. Low temperature and high pressure

B. High temperature and low pressure

C. High temperature and high pressure

D. Low temperature and low pressure

110. ____________ does not change during phase transformation processes like sublimation, melting & vaporisation?
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A. Entropy

B. Internal energy

C. Gibbs free energy

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

111. The intensive properties are_____________?
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A. Molar volume, density, viscosity and boiling point

B. Refractive index and surface tension

C. Both A. and B

D. None of these

112. Activity co-efficient is a measure of the____________________?
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A. Vapour pressure of liquid

B. None of these

C. Departure from ideal solution behaviour

D. Departure of gas phase from ideal gas law

113. Equilibrium constant of a reaction varies with the____________________?
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A. Pressure

B. None of these

C. Initial concentration of the reactant

D. Temperature
114. Which of the following non-flow reversible compression processes require maximum work ?
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A. Isobaric process

B. All require same work

C. Adiabatic process

D. Isothermal process

115. At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?
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A. Critical

B. Eutectic

C. Plait

D. Triple
116. The reaction A (l) ? R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?
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A. 3

B. 1

C. 2

D. 0

117. Which of the following exemplifies an adiabatic process ?
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A. Condensation of alcohol vapor

B. Sudden bursting of a cycle tube

C. Evaporation of water

D. Melting of ice

118. Sound waves propagation in air exemplifies an ______________ process?
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A. Adiabatic

B. Isothermal

C. None of these

D. Isometric

119. Normal temperature and pressure (N.T.P.) corresponds to ___________________?
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A. 0C and 760 mm Hg

B. 20C and 760 mm Hg

C. 0C and 1 kgf/cm2

D. 15C and 760 mm Hg

120. The second law of thermodynamics states that___________________?
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A. None of the above

B. It is not possible to transfer heat from a lower temperature to a higher temperature

C. The energy change of a system undergoing any reversible process is zero

D. The total energy of system and surrounding remains the same

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

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