Refractory Technology - Section 1 (6)

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.

41.

RUL of refractories depends on the

A.	chemical composition.
B.	physical structure.
C.	presence of impurities like iron & alkali.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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42.

Fusion point of a basic refractory material is

A.	reduced by the addition of acid oxides.
B.	increased by the addition of acid oxides.
C.	not affected by the addition of acid oxides.
D.	always less than 1000°C.

Answer: Option A

Explanation:

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43.

Fireclay bricks are not used in the

A.	beehive coke oven.
B.	by-product coke oven walls.
C.	combustion chamber of B.F. stoves.
D.	coke oven regenerators.

Answer: Option B

Explanation:

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44.

Panel test determines the __________ of refractories.

A.	fusion point
B.	spalling resistance
C.	slag penetration resistance
D.	refractoriness under load (RUL)

Answer: Option B

Explanation:

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45.

An indication of degree of firing in silica brick is its

A.	specific gravity
B.	fusion point
C.	RUL
D.	none of these

Answer: Option A

Explanation:

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46.

Quartz is

A.	stable form of silica upto 870°C.
B.	converted to tridymite on firing between 870 to 1470°C.
C.	transformed to crystoballite on heating above 1470°C.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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47.

Hollow refractory bricks are made by

A.	slip casting
B.	hand moulding
C.	pressing/machine moulding
D.	extrusion

Answer: Option A

Explanation:

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48.

Firing temperature of magnesite bricks is about __________ °C.

A.	800-1000
B.	1000-1200
C.	1600-1800
D.	2400-2600

Answer: Option C

Explanation:

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