Chemical Engineering MCQs

6108 MCQs (Page 351 of 611)

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Magnesite bricks are used in those parts of furnaces, which are __________________?

A. Subjected to temperature fluctuation
B. Required to resist corrosive basic slag
C. Subjected to high load
D. None of these

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High thermal conductivity of a refractory material is not important, when it is to be used in the______________________?

A. Coke oven regenerators
B. Muffle furnace
C. Blast furnace
D. Recuperators

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Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?

A. 1520
B. 1630
C. 1670
D. 1730

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Basic bricks are not made of ___________________?

A. Fireclay
B. Magnesite
C. Forsterite
D. Chromite

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A steel member used in the furnace construction to take the thrust of the brickwork is called___________________?

A. Buckstay
B. Breast wall
C. Armouring
D. Baffle

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Hollow refractory bricks are made by___________________?

A. Slip casting
B. Hand moulding
C. Pressing/machine moulding
D. Extrusion

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Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000

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With increase in the porosity, thermal spalling resistance of fireclay brick___________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease

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Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except ?

A. Cost
B. Electrical conductivity
C. Thermal conductivity
D. Fusion point

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Quartz is___________________?

A. Stable form of silica upto 870°c
B. Converted to tridymite on firing between 870 to 1470°c
C. Transformed to cristobalite on heating above 1470°c
D. All a., b. and c.

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