chemical engineering MCQs – Page 407

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

8121. Which of the following is an extensive property of a system ?
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A. Concentration

B. Pressure

C. Molal heat capacity

D. Heat capacity

8122. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?
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A. Vaporisation

B. Transition

C. None of these

D. Fusion

8123. Activity co-efficient is a measure of the____________________?
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A. Vapour pressure of liquid

B. Departure of gas phase from ideal gas law

C. None of these

D. Departure from ideal solution behaviour

8124. 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

8125. 1st law of thermodynamics is nothing but the law of conservation of___________________?
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A. Energy

B. Momentum

C. None of these

D. Mass

8126. Cp of a gas at its critical temperature and pressure_______________?
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A. Becomes infinity

B. Equals 0.24 kcal/kmol K

C. Equals 1 kcal/kmol K

D. Becomes zero

8127. The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________?
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A. 1

B. Either B. or C, depends on the nature of the gas

C. 1

8128. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is ______________ law?
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A. Kirchoffs

B. None of these

C. Hesss

D. Lavoisier and Laplace

8129. ______________ Equation predicts the activity co-efficient from experimental data ?
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A. Lewis-Randall

B. Margules

C. Van Laar

D. Both B. & C.

8130. Fugacity and pressure are numerically equal, when the gas is____________________?
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A. In standard state

B. In ideal state

C. At high pressure

D. At low temperature

8131. Entropy of a substance remains constant during a/an ____________ change?
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A. Irreversible isothermal

B. Reversible adiabatic

C. None of these

D. Reversible isothermal

8132. Kopps rule is used to calculate the heat capacity of___________________?
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A. Liquids

B. Gases

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

D. Solids

8133. (?T/?P)H is the mathematical expression for__________________?
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A. Specific heat at constant volume (Cv)

B. None of these

C. Specific heat at constant pressure (Cp)

D. Joule-Thompson co-efficient

8134. Requisites of a reversible process is that the ____________________?
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A. Friction in the system should be absent

B. System and surroundings temperature be equal

C. System and surroundings pressure be equal

D. None of these

8135. Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
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A. Gibbs free energy

B. Enthalpy

C. Internal energy

D. Entropy

8136. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?
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A. Process must be isobaric

B. Temperature must decrease

C. Process must be adiabatic

D. Both B. and C.

8137. Cp Cv = R is valid for ______________ gases?
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A. All of the above

B. Very low temperature

C. Ideal

D. Very high pressure

8138. The minimum number of phases that can exist in a system is________________?
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A. 1

B. 0

C. 2

D. 3

8139. The specific heat of saturated water vapour at 100C is__________________?
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A. an data-mce-type="bookmark" style="width: 0px;overflow: hidden;line-height: 0" class="mce_SELRES_start">?</span>A. ?

B. 0

C. #NAME?

D. -ve

8140. Cv for an ideal gas__________________?
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A. Does not depend upon temperature

B. Is independent of pressure only

C. Is independent of volume only

D. Is independent of both pressure and volume

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