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

Related Mcqs:

1. Semi-silica bricks compared to silica bricks have_______________?

   A. Less fusion point
   B. Better spalling resistance
   C. Both A. and B.
   D. Neither A. not B.

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

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

3. Outer combustion chamber of blast furnace stove is lined with _____________ bricks?

   A. Fireclay
   B. Silica
   C. Chrome magnesite
   D. Zirconia

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

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

5. 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.

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

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

7. 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

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

   A. Silica bricks
   B. Fireclay bricks
   C. High alumina bricks
   D. Tar dolomite bricks

9. 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

10. Which of the following impurities reduces the refractoriness of magnesite bricks ?

    A. Al2O3
    B. CaO
    C. SiO2
    D. All A., B. & C.