Chemical Engineering MCQs

Page No. 584

An example of autothermal reactor operation is______________________?


aSulphur dioxide oxidation

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bEthylene oxidation

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cBenzene oxidation

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dAmmonia synthesis

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View Answer Ethylene oxidation

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?


aEqual in size

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bOf different sizes

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cOf such size that the ratio of their volumes is < 5

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dNone of these

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View Answer Equal in size

________________ resistance is not involved in the combustion of a carbon particle?


aGas film

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bAsh

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cChemical reaction

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dNone of these

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View Answer Ash

The value of ‘n’ for a chemical reaction A → B, whose reaction rate is → CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?


a0

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b1

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c2

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d3

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View Answer 3

A photochemical reaction is _______________ light?


aInitiated by

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bAccompanied with emission of

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cCatalysed by

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dUsed to convert heat energy into

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View Answer Initiated by

Participation of _______________ is involved in the occurrence of a chemical reaction?


aProtons

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bNeutrons

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cElectrons

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dNone of these

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View Answer Electrons

The first order series reaction as shown in the bellow figure is conducted in a batch reactor. The initial concentrations of A, B and C (CA0, CB0, CC0 respectively) are all non-zero. The variation of CB with reaction time will not show a maximum, if___________________?


ak2 CB0 > k1 CA0

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bk CA0 > k2.CB0

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cCB0 > CA0

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dCA0 > CB0

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View Answer k2 CB0 > k1 CA0

In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?


aMore than

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bLess than

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cSame as

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dData insufficient; can’t be predicted

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View Answer Same as

Ore concentration by jigging is based on the difference in the ______________ of the particles?


aSpecific gravities

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bWettability

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cShape

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dNone of these

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View Answer Specific gravities

Use of baffles in agitators help in minimising the ______________ tendency?


aSwirling

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bVortexing

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

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