Chemical Engineering MCQs

Page No. 564

The order of the chemical reaction as shown in the bellow figure, whose rate equation is given as -rA = KCA_________________?


a0


b1


c2


d3


View Answer 3

Maximum equilibrium conversion for endothermic reaction is obtained at the ______________ temperature?


aHighest possible


bLowest possible


cIntermediate


dRoom


View Answer Highest possible

A space velocity of 5 hr-1 means that ___________________?


aFive reactor volumes of feed (at specified conditions) are being fed into the reactor per hour


bAfter every 5 hours, reactor is being filled with the feed


cCent per cent conversion can be achieved in at least 5 hours


dA fixed conversion of a given batch of feed takes 5 hours



The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?


a400


b500


c600


d1000


View Answer 600

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?


aFilm diffusion


bDiffusion through ash layer


cChemical reaction


dEither A., B. or C.


View Answer Chemical reaction

For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases ______________ times?


a8


b12


c16


d32


View Answer 16

Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?


aAsh resistance


bGas film and pore surface diffusion resistances for reactants


cSurface phenomenon resistance


dGas film and pore surface diffusion resistances for products


View Answer Ash resistance

The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________?


aAlways irreversible


bInsensitive to temperature changes


cMostly irreversible


dHighly temperature sensitive



A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes?


a4


b8


c12


d16


View Answer 16

Fluidised bed reactor is characterized by____________________?


aUniformity of temperature


bComparatively smaller equipment


cVery small pressure drop


dAbsence of continuous catalyst regeneration facility



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