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

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b1

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c2

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d3

✓


View Answer 3

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


aHighest possible

✓


bLowest possible

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cIntermediate

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dRoom

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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

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

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

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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

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b500

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c600

✓


d1000

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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

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bDiffusion through ash layer

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cChemical reaction

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dEither A., B. or C.

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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

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b12

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c16

✓


d32

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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

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cSurface phenomenon resistance

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dGas film and pore surface diffusion resistances for products

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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

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bInsensitive to temperature changes

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cMostly irreversible

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dHighly temperature sensitive

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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

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b8

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c12

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d16

✓


View Answer 16

Fluidised bed reactor is characterized by____________________?


aUniformity of temperature

✓


bComparatively smaller equipment

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cVery small pressure drop

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dAbsence of continuous catalyst regeneration facility

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