Refractory Technology MCQs

Question 1

Addition of zircon to silica refractory brick improves its

Accepted Answer

Resistance to slag attack

Answer

Crushing strength

Answer

Neither A nor B

Answer

Neither A nor B

Question 2

Which is a neutral refractory?

Accepted Answer

Graphite

Answer

Magnesite chrome

Answer

Silica

Answer

Magnesia

Question 3

Pick out the wrong statement.

Accepted Answer

Ceramic materials do not undergo vitrification on heating

Answer

A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass

Answer

Ceramic materials are brittle in nature

Answer

Non-oxide ceramic materials generally act as a semi-conductor

Question 4

Chrome magnesite bricks are used in the

Accepted Answer

All of the above

Answer

Side walls of soaking pits and arc furnaces

Answer

Copper melting furnaces & converters

Answer

Burner block of glass tanks

Question 5

Fusion temperature of pure silica (SiO 2 ) is __________ °C.

Accepted Answer

1715

Answer

1350

Answer

2570

Answer

2800

Question 6

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

Accepted Answer

Blast furnace

Answer

Coke oven regenarators

Answer

Muffle furnace

Answer

Recuperators

Question 7

Which is an acidic refractory?

Accepted Answer

Fireclay

Answer

Magnesite

Answer

Dolomite

Answer

Chrome magnesite

Question 8

Which is required in an insulating refractory?

Accepted Answer

Neither A nor B

Answer

High thermal conductivity

Answer

Low porosity

Answer

Both A & B

Question 9

Vacuum steel degassing units are lined with

Accepted Answer

High alumina bricks

Answer

Silica bricks

Answer

Low duty firebricks

Answer

Graphite blocks