chemical engineering MCQs – Page 404

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 Review each marked answer and report any item that may be outdated or unclear.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

8061. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, ? S1 and ? SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?
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A. ? S1 is always > ? SR

B. ? S1 is always ? SR

C. ? S1 is always = ? SR

8062. In jet refrigerators, the refrigerating fluid is practically always_________________?
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A. Brine

B. Water

C. Ammonia

D. Freon

8063. Pick out the Clausius-Clapeyron equation from the following?
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A. None of these

B. ?F = ?H + T [?(?F)/?T]P

C. ln P = (?H/RT) + constant

D. dP/dT = ?H/T?V

8064. Out of the following refrigeration cycles, which one has maximum COP ?
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A. Ordinary vapor compression cycle

B. Carnot cycle

C. Air cycle

D. Vapor compression with a reversible expansion engine

8065. 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. 0

C. 1

D. 2

8066. Air-refrigeration cycle________________?
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A. Is the most efficient of all refrigeration cycles

B. Has very low efficiency

C. Requires relatively large quantities of air to achieve a significant amount of refrigeration

D. Both B. and C

8067. In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of n is_________________?
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A. y = 1.44

B. 1

C. 0

D. 1.66

8068. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?
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A. Zero

B. Negative

C. Infinity

D. Positive

8069. Enthalpy of a gas depends upon its___________________?
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A. Mass

B. Pressure

C. Volume

D. Temperature

8070. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13C and 37C respectively, the Carnot COP will be________________?
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A. 0.168

B. 6.2

C. 5.2

D. Data insufficient, cant be found out

8071. 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. Pressure

B. Temperature

C. None of these

D. Steam to ethylene ratio

8072. Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes?
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A. Reaction mechanism

B. None of these

C. Calculation of rates

D. Energy transformation from one form to another

8073. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________?
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A. solution

B. Solubility increases as temperature decreases

C. Solubility is independent of temperature

D. Solubility increases or decreases with temperature depending on the Gibbs free energy change

E. Solubility increases as temperature increases

8074. Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?
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A. Use of only one graph for all gases

B. Covering of wide range

C. Easier plotting

D. More accurate plotting

8075. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?
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A. Triple

B. Boyle

C. Freezing

D. Boiling

8076. Critical compressibility factor for all substances___________________?
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A. Are more or less constant (vary from 0.2 to 0.3)

B. Vary as square of the absolute temperature

C. None of these

D. Vary as square of the absolute pressure

8077. Free energy change of mixing two liquid substances is a function of the__________________?
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A. Temperature only

B. All A, B. and C

C. Concentration of the constituents only

D. Quantities of the constituents only

8078. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ?
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A. Logarithmic

B. Geometric

C. Arithmetic

D. Harmonic

8079. Gibbs free energy per mole for a pure substance is equal to the__________________?
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A. Latent heat of vaporisation

B. Molal boiling point

C. Heat capacity

D. Chemical potential

8080. Compressibility factor for almost all the gases are approximately same at the same__________________?
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A. Critical pressure and critical temperature

B. Reduced pressure and reduced temperature

C. Pressure and temperature

D. None of these

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