Chemical Engineering MCQs

Page No. 148

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


aEntropy


bGibbs free energy


cInternal energy


dAll (A), B. & (C)


View Answer Gibbs free energy

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


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depends on the gas


View Answer Remains unchanged

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


aShifting the equilibrium towards right


bShifting the equilibrium towards left


cNo change in equilibrium condition


dNone of these



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


bV2/V1


c V1 – V2


dV1.V2


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


b174 K


c174 K


d154 K


View Answer 174 K

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


aContracts


bExpands


cDoes not change in volume


dEither (A), B. or (C)


View Answer Contracts

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


aNon-flow reversible


bAdiabatic


cBoth A. and B


dNeither A. nor B


View Answer Both A. and B

Sound waves propagation in air exemplifies an ______________ process?


aAdiabatic


bIsothermal


cIsometric


dNone of these


View Answer Adiabatic

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


aZero


b One


cTwo


d Three


View Answer One

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


aIt should be non-explosive


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


cIts vapor pressure at the condenser temperature should be very high


dNone of these



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