Chemical Engineering MCQs

Page No. 148

____________ does not change during phase transformation processes like sublimation, melting & vaporisation?


aEntropy

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bGibbs free energy

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cInternal energy

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dAll (A), B. & (C)

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View Answer Gibbs free energy

At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure?


aIncreases

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bDecreases

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cRemains unchanged

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dMay increase or decrease; depends on the gas

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View Answer Remains unchanged

In the reaction; N2 + O2 ⇌ 2NO, increasing the pressure will result in_________________?


aShifting the equilibrium towards right

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bShifting the equilibrium towards left

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cNo change in equilibrium condition

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dNone of these

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The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?


aV1/V2

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bV2/V1

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c V1 – V2

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dV1.V2

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View Answer V1/V2

1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be ?


a35 K

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b174 K

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c174 K

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d154 K

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View Answer 174 K

The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?


aContracts

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bExpands

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cDoes not change in volume

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dEither (A), B. or (C)

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View Answer Contracts

Work done may be calculated by the expression ∫ p dA for _____________ processes ?


aNon-flow reversible

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bAdiabatic

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cBoth A. and B

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dNeither A. nor B

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View Answer Both A. and B

Sound waves propagation in air exemplifies an ______________ process?


aAdiabatic

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bIsothermal

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cIsometric

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dNone of these

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View Answer Adiabatic

The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are__________________?


aZero

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b One

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cTwo

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d Three

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View Answer One

Which of the following is an undesirable characteristic of a refrigerant ?


aIt should be non-explosive

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bIt should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

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cIts vapor pressure at the condenser temperature should be very high

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dNone of these

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