Refractory Technology - Section 1 (5)

Directions to Solve

Refractory Technology - Section 1

This is a technology field and there are MCQs available to solve
which are based on this field. You will find these problems in this section.

33.

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.

Answer: Option B

Explanation:

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34.

Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

A.	spalling resistance.
B.	refractoriness.
C.	refractoriness under load (RUL).
D.	none of these.

Answer: Option A

Explanation:

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35.

Roof of a basic electric furnace is made of __________ bricks.

A.	superduty fireclay
B.	silica
C.	chromite
D.	none of these

Answer: Option B

Explanation:

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36.

Magnesite refractories are used for the construction of those furnaces, which are

A.	not required to resist the corrosive action of basic slag.
B.	not subjected to fluctuation in temperature.
C.	used for raising & maintaining high temperature.
D.	both (b) and (c)

Answer: Option D

Explanation:

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37.

Test piece for determination of RUL of a refractory is heated in a/an

A.	oxidising atmosphere
B.	reducing atmosphere
C.	electric furnace
D.	neutral atmosphere

Answer: Option C

Explanation:

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38.

Grog

A.	contains both alumina and silica.
B.	iscrushed firebrick.
C.	is a non-plastic material.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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39.

Resistance to slag attack of a refractory

A.	depends on the nature of slag & refractory.
B.	decreases at higher temperature.
C.	decreases, if defective joints & cracks exist in the refractory.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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40.

Which is the stable form of silica between 1470°C and the melting point 1713°C ?

A.	Cristobalite
B.	Tridymite
C.	Quartz
D.	None of these

Answer: Option A

Explanation:

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