chemical engineering MCQs – Page 405

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 Review each marked answer and report any item that may be outdated or unclear.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
8081. The quantitative effect of temperature on chemical equilibrium is given by the____________________?
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A. None of these

B. Le-Chateliers principle

C. Arrhenius equation

D. Vant-Hoff equation
8082. A refrigerator may be termed as a____________________?
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A. Heat pump

B. Carnot engine

C. None of these

D. Heat engine

8083. Heat of reaction at constant volume is identified with _____________ change?
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A. Enthalpy

B. Neither A. nor B

C. Either A. or B

D. Internal energy
8084. The equation DU = Tds PdV is applicable to infinitesimal changes occuring in_________________?
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A. A closed system of constant composition

B. A closed system with changes in composition

C. An open system of constant composition

D. An open system with changes in composition

8085. For a thermodynamic system containing x chemical species, the maximum number of phases that can co-exist at equilibrium is_________________?
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A. x

B. x + 1

C. x + 3

D. x + 2
8086. The necessary condition for phase equilibrium in a multiphase system of N components is that the____________________?
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A. Sum of the chemical potentials of any given component in all the phases should be the same

B. Chemical potentials of all components should be same in a particular phase

C. Chemical potentials of a given component should be equal in all phases

D. None of these

8087. In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________?
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A. Either of the above three; depends on the nature of refrigerant

B. #NAME?

C. #NAME?

D. 0
8088. An isentropic process is carried out at constant____________________?
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A. Temperature

B. Pressure

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

D. Volume
8089. Adiabatic compression of a saturated water vapour makes it ____________________ ?
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A. Supersaturated

B. Superheated

C. Both A. and B

D. Neither A. nor B

8090. In an ideal gas mixture, fugacity of a species is equal to its___________________?
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A. None of these

B. Chemical potential

C. Vapor pressure

D. Partial pressure
8091. _____________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low?
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A. Bucket

B. Throttling

C. A combination of separating & throttling

D. Separating

8092. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the_______________?
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A. High pressure and low temperature

B. Low pressure and low temperature

C. Low pressure and high temperature

D. High pressure and high temperature

8093. Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?
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A. None of these

B. Zero

C. Infinity

D. Minus infinity
8094. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?
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A. Enhanced COP

B. No change in the value of COP

C. Increased or decreased COP; depending upon the type of refrigerant

D. Decreased COP

8095. Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?
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A. Partial pressure

B. Fugacity

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

D. Activity co-efficient

8096. Generation of heat by friction is an example of a/an ________________ change?
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A. Reversible

B. Irreversible

C. Adiabatic

D. Isothermal

8097. 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

8098. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?
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A. Gibbs free energy

B. Helmholtz free energy

C. Internal energy

D. Enthalpy

8099. Compressibility factor of a gas is___________________?
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A. Not a function of its pressure

B. Unity, if it follows PV = nRT

C. Not a function of its nature

D. Not a function of its temperature

8100. Linde gas liquefaction process employs cooling ____________________?
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A. By throttling

B. By expansion in an engine

C. At constant pressure

D. None of these