Ferromagnetic ceramic material is not used in the__________________?

Related Mcqs:

1. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?

   A. Hearth of the blast furnace
   B. Nuclear reactors, missiles & space crafts
   C. Insulation of high temperature furnaces
   D. Roof of electric furnaces

2. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?

   A. 80 and 20
   B. 20 and 80
   C. 50 and 50
   D. 60 and 40

3. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?

   A. Fireclay
   B. Silicon carbide
   C. Corundum
   D. Siliceous fireclay

4. Fireclay bricks is not used for lining the__________________?

   A. Cupola
   B. Gas producer
   C. Bottom of hot metal mixer
   D. Roof of open hearth furnace

5. Fireclay bricks are used in the__________________?

   A. Coke ovens regenerator
   B. Outer lining of L.D. converter
   C. Hearth bottom of blast furnace
   D. Coke oven walls

6. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?

   A. Aluminium phosphate
   B. Water
   C. Lime
   D. Plaster of Paris

7. Mixing of ground refractory material and water is done in a ______________ mill?

   A. Pug
   B. Ball
   C. Tube
   D. Rod

8. High thermal conductivity of a refractory material is not important, when it is to be used in the______________________?

   A. Coke oven regenerators
   B. Muffle furnace
   C. Blast furnace
   D. Recuperators

9. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

   A. 55
   B. 70
   C. 80
   D. 90

10. 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