Related Mcqs:

1. Roof of a basic open hearth furnace is lined with ______________ bricks?

   A. Silica
   B. Fireclay
   C. Dolomite
   D. Magnesite

2. ____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?

   A. High thermal conductivity
   B. Low porosity
   C. Non-wetting characteristics
   D. High density

3. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?

   A. Non-wetting characteristic
   B. High thermal conductivity
   C. High crushing strength
   D. None of these

4. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?

   A. 1800
   B. 2200
   C. 2400
   D. 2700

5. Roof of a basic electric furnace is made of _____________ bricks?

   A. Superduty fireclay
   B. Silica
   C. Chromite
   D. None of these

6. In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?

   A. 20°
   B. 40°
   C. 60°
   D. 80°

7. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?

   A. High refractoriness
   B. High resistance to spalling
   C. High strength and density
   D. All A., B. and C.

8. Which of the following bricks should not be used, if the furnace is to be used intermittently ?

   A. Firebricks
   B. Silica bricks
   C. Silicon carbide bricks
   D. Sillimanite

9. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?

   A. Oxidising
   B. Neutral
   C. Either A. or B.
   D. Neither A. nor B.

10. Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

    A. Silica
    B. Fireclay
    C. Magnesite
    D. Zirconia