Pure oxide refractories are generally monocrystalline in nature and are self bonded ______________ bricks are generally used as moderator in nuclear reactors?

Related Mcqs:

1. Faster rate of drying of moulded refractories results in high ______________ of refractories?

   A. Green strength B. Voids C. Shrinkage D. Both B. and C....

2. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the ____________________?

   A. Atomic weight of the metal is 4 B. Equivalent weight of the metal is 4 C. Atomic weight of the metal is 2 D. Equivalent weight of the metal is 8...

3. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is___________________?

   A. Less than 100°C B. 100°C C. Between 100 and 110°C D. 110.6°C...

4. Magnesite refractories are generally not used in the__________________?

   A. Electric furnace walls B. Steel melting furnace C. Open hearth furnace D. Burning zone of cement kilns...

5. Refractories used in/for ______________ should have low thermal conductivity?

   A. Coke ovens B. Insulation C. Regenerators D. Muffle furnaces...

6. Panel test determines the ______________ of refractories?

   A. Fusion point B. Spalling resistance C. Slag penetration resistance D. Refractoriness under load (RUL)...

7. Presence of MgO in alumino-silicate refractories ______________ its refractoriness ?

   A. Increases B. Lowers C. Does not affect D. Either A. or B.; depends on its quantity...

8. Hot metal runner in blast furnace are lined with ______________ bricks?

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

9. Roof of a basic electric furnace is made of ______________ bricks?

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

10. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?

    A. 770 B. 570 C. 270 D. 70...