Refractory Technology MCQs

Question 1

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

Accepted Answer

Both (B) and (C)

Answer

Not required to resist the corrosive action of basic slag

Answer

Not subjected to fluctuation in temperature

Answer

Used for raising & maintaining high temperature

Question 2

Cold crushing strength of fireclay bricks is about __________ kgf/cm 2 .

Accepted Answer

200 - 400

Answer

50 - 100

Answer

100 - 150

Answer

500 - 1000

Question 3

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Accepted Answer

Silica

Answer

Fireclay

Answer

Dolomite

Answer

Very low alumina

Question 4

Fusion point of an acidic refractory material is

Accepted Answer

Reduced by the addition of basic oxides

Answer

Increased by the addition of basic oxides

Answer

Not affected by the addition of basic oxides

Answer

Not affected by the addition of basic oxides

Question 5

Refractoriness/fusion points of 'superduty' refractories is __________ °C.

Accepted Answer

> 1730

Answer

1520-1630

Answer

1630-1670

Answer

> 2000

Question 6

Chemically, mullite refractories is

Accepted Answer

3Al 2 O 3 .2SiO 2

Answer

Al 2 O 3

Answer

ZrSO 4

Answer

ThO 2

Question 7

Basic bricks are not made of

Accepted Answer

Fireclay

Answer

Magnesite

Answer

Foresterite

Answer

Chromite

Question 8

Carbon refractories are exclusively used in the

Accepted Answer

Hearth of blast furnace

Answer

Walls of coke oven

Answer

Regenerators of coke oven

Answer

Side wall of soaking pits

Question 9

Sillimanite is a __________ refractory.

Accepted Answer

High alumina

Answer

Basic

Answer

Neutral

Answer

Insulating