Chemical Engineering MCQs

Page No. 584

An example of autothermal reactor operation is______________________?


aSulphur dioxide oxidation


bEthylene oxidation


cBenzene oxidation


dAmmonia synthesis


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


bOf different sizes


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


dNone of these


View Answer Equal in size

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


aGas film


bAsh


cChemical reaction


dNone of these


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


b1


c2


d3


View Answer 3

A photochemical reaction is _______________ light?


aInitiated by


bAccompanied with emission of


cCatalysed by


dUsed to convert heat energy into


View Answer Initiated by

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


aProtons


bNeutrons


cElectrons


dNone of these


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


bk CA0 > k2.CB0


cCB0 > CA0


dCA0 > CB0


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


bLess than


cSame as


dData insufficient; can’t be predicted


View Answer Same as

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


aSpecific gravities


bWettability


cShape


dNone of these


View Answer Specific gravities

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


aSwirling


bVortexing


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

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