chemical engineering MCQs – Page 403

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 Review each marked answer and report any item that may be outdated or unclear.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

8041. Entropy of an ideal gas depends upon its__________________?
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A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

8042. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?
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A. Either A. or B

B. Cold reservoir approaches zero

C. Neither A. nor B

D. Hot reservoir approaches infinity

8043. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?
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A. Fusion

B. Transition

C. Sublimation

D. Vaporisation

8044. The chemical potential of a component (?i) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________?
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A. (?G/?ni)T, P, nj = (?A/?ni) T, v, nj

B. (?E/?ni)S, v, nj

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

D. (?H/?ni)S, P, nj

8045. Which of the following is not affected by temperature changes ?
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A. Fugacity

B. Activity co-efficient

C. None of these

D. Free energy

8046. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?
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A. (T1 T2)/T2

B. (T2 T1)/T2

C. (T2 T1)/T1

D. (T1 T2)/T1

8047. The most important application of distribution law is in_____________________?
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A. Evaporation

B. Drying

C. Distillation

D. Liquid extraction

8048. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?
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A. Positive

B. None of these

C. Negative

D. Zero

8049. A large iceberg melts at the base, but not at the top, because of the reason that_________________?
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A. The iceberg remains in a warmer condition at the base

B. All A, B. and C

C. Due to the high pressure at the base, its melting point reduces

D. Ice at the base contains impurities which lowers its melting point

8050. A domestic refrigerator has a/an ____________ cooled condenser?
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A. Gas

B. Air

C. Evaporative

D. Water

8051. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____________ as its mole fraction increases?
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A. Decreases linearly

B. Remain same

C. Decreases

D. Increases

8052. Joule-Thomson co-efficient is defined as__________________?
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A. ? = (?E/?T)H

B. ? = (?T/?P)H

C. ? = (?E/?P)H

D. ? = (?P/?T)H

8053. Critical temperature is defined as the temperature above which a gas will____________________?
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A. Not liquify (barring exceptions)

B. Immediately liquify

C. None of these

D. Never liquify however high the pressure may be

8054. The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is__________________?
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A. Henrys law

B. Called Lewis-Randall rule

C. None of these

D. The statement as per Gibbs-Helmholtz

8055. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is_________________?
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A. None of these

B. The distribution law

C. Followed from Margules equation

D. A corollary of Henrys law

8056. A gas has a volume of 27.3 c.c. at 0C. Its volume at 10C (if pressure remains unchanged) will be _____________ c.c?
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A. 2.73

B. 273

C. 28.3

D. 283

8057. The equilibrium constant for a chemical reaction at two different temperatures is given by__________________?
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A. Kp2/Kp1 = (1/R) (1/T2 1/T1)

B. Kp2/Kp1 = (?H/R) (1/T2 1/T1)

C. Kp2/Kp1 = (?H/R) (1/T2 1/T1)

D. Kp2/Kp1 = ?H (1/T2 1/T1)

8058. Second law of thermodynamics is concerned with the_________________?
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A. Non-cyclic processes only

B. Direction of energy transfer

C. Amount of energy transferred

D. Irreversible processes only

8059. The energy of activation of exothermic reaction is_________________?
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A. Negative

B. Not possible to predict

C. Very large compared to that for endothermic reaction

D. Zero

8060. Maximum work that could be secured by expanding the gas over a given pressure range is the _____________ work?
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A. None of these

B. Isentropic

C. Adiabatic

D. Isothermal

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