REFRACTORY TECHNOLOGY QUIZ

Spalling of a refractory means its

Fracture due to uneven expansion at high temperature

Resistance to chemical action of gases and molten fluxes

Softening

Resistancce to compressive loads

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a high alumina refractory material?

Diaspore

Sillimanite

Periclase

Kyanite

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum safe working temperature for fireclay bricks is about __________ °C.

1550

1150

1300

1450

TRUE ANSWER : ?
YOUR ANSWER : ?

Refractory bricks with lower permeability is produced by using

Higher firing temperature

Finer grog size

Higher moulding pressure

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Firing of refractory brick is done to

All of these

Dehydrate the dried refractory

Develop stable mineral forms in them

Form ceramic bonds necessary for development of high crushing strength in the finished product

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnesite chrome bricks are used in the

All of these

Soaking pits

Roof lining of basic open hearth & other basic furnaces

Reheating furnaces

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Soaking pits

Rotary lime kiln

L.D. converter

Ceheating furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

14-20

2-3

7-12

5-7

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Increases

Either A or B; depends on its quantity

Does not affect

Lowers

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is not a basic refractory?

Silicon carbide

Chrome magnesite

Dolomite

Magnesite

TRUE ANSWER : ?
YOUR ANSWER : ?