Chemical Engineering MCQs

Page No. 273

Si percentage in silica refractories used in the walls of coke oven is about______________________?


a45

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b60

✖


c80

✖


d95

✓


View Answer 95

In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?


a20°

✖


b40°

✖


c60°

✓


d80°

✖


View Answer 60°

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about ______________ percent?


a5

✖


b20

✓


c35

✖


d55

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View Answer 20

Carbon Content by weight in air dried wood may be about _______________ percent?


a10

✖


b25

✖


c50

✓


d80

✖


View Answer 50

Which of the following has the least calorific value (kcal/Nm3) ?


aBlast furnace gas

✓


bCoke oven gas

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cSewage gas

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dNatural gas

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View Answer Blast furnace gas

Turndown ratio of a gas burner is equal to the __________________ ?


aMaximum to minimum heat input ratio

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bMaximum to minimum permissible gas flow rate

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cBoth A. & B.

✓


dMinimum to maximum heat input ratio

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View Answer Both A. & B.

Which of the following gaseous fuels has the lowest calorific value ?


aGobar gas

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bRefinery gas

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cConverter gas

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dBlast furnace gas

✓


View Answer Blast furnace gas

Ignition temperature of a fuel in air is ______________ that in pure oxygen?


aMore than

✓


bLess than

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cEqual to

✖


dEither more or less; depends on the type of fuel

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View Answer More than

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?


aMgO & Na2CO3

✓


bMgSO4 & BaCl2

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cBaSO4 & NaCl

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dMgCO3 & NaCl

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View Answer MgO & Na2CO3

Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?


aDecreases the hardness of coke

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bDecreases the abrasion resistance of coke

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cCauses brittleness in steel

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dNone of these

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View Answer None of these

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