Refractory Technology MCQs

Question 1

The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

Accepted Answer

Fireclay

Answer

Silica

Answer

Magnesite

Answer

Corundum

Question 2

Cermets are

Accepted Answer

All of the above

Answer

Composite material containing both ceramic & metallic constituents

Answer

Having high strength & resistance to high temperature

Answer

Used in space vehicles, missiles & nuclear energy plants

Question 3

__________ nozzles are used in continuous casting of steel,

Accepted Answer

Zircon

Answer

Thoria

Answer

Carborundum

Answer

Beryllia

Question 4

Highest melting (m.p = 3070°C) oxide refractory is

Accepted Answer

Thoria

Answer

Alumina

Answer

Zirconia

Answer

Magnesia

Question 5

Which of the following bricks has the most close values of RUL and PCE?

Accepted Answer

Silica bricks

Answer

Fireclay bricks

Answer

High alumina bricks

Answer

Tar dolomite bricks

Question 6

With decrease in porosity, the __________ of the refractories decreases.

Accepted Answer

Spalling resistance

Answer

Strength

Answer

Thermal conductivity

Answer

None of these

Question 7

Magnesite chrome bricks are used in the

Accepted Answer

All of the above

Answer

Roof lining of basic open hearth & other basic furnaces

Answer

Reheating furnaces

Answer

Soaking pits

Question 8

__________ bricks should not be used in oxidising atmosphere.

Accepted Answer

Carbon

Answer

Tar dolomite

Answer

Silica

Answer

Fireclay

Question 9

Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?

Accepted Answer

L.D. converter

Answer

Soaking pits

Answer

Ceheating furnace

Answer

Rotary lime kiln