Chemical Engineering MCQs

Page No. 72

Ideal gas law is applicable at____________________?


aLow T, low P


b High T, high P


cLow T, high P


dHigh T, low P


View Answer High T, low P

Work done in case of free expansion is____________________?


aIndeterminate


bZero


cNegative


dNone of these


View Answer Zero

When a gas is subjected to adiabatic expansion, it gets cooled due to__________________?


aDecrease in velocity


bDecrease in temperature


cDecrease in kinetic energy


dEnergy spent in doing work



A solid is transformed into vapour without going to the liquid phase at_________________?


aTriple point


bBoiling point


cBelow triple point


d Always


View Answer Triple point

A Carnot cycle consists of the following steps ?


aTwo isothermal and two isentropic


b Two isobaric and two isothermal


cTwo isochoric and two isobaric


d Two isothermals and two isochoric



“The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances”. This is the_________________?


aLewis-Randall rule


b Statement of Van’t Hoff Equation


cLe-Chatelier’s principle


dNone of these


View Answer None of these

Claude’s liquefaction process employs the cooling of gases by__________________?


aExpansion in an engine


bFollowing a constant pressure cycle


c Throttling


dNone of these



Cp – Cv = R is valid for ______________ gases?


a Ideal


b Very high pressure


cVery low temperature


dAll of the above


View Answer Ideal

Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?


ad ln p/dt = Hvap/RT2


bd ln p/dt = RT2/Hvap


cdp/dt = RT2/Hvap


ddp/dt = Hvap/RT2


View Answer d ln p/dt = Hvap/RT2

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


aPositive


bNegative


cZero


dInfinity


View Answer Zero

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