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

Related Mcqs:

1. A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be_______________?

   A. -136.5°C B. – 136.5°K C. -273°C D. 0°K...

2. Silica bricks are never used for lining the_________________?

   A. Beehive coke ovens B. By-product coke ovens C. Dome of blast furnace stoves D. Roof of open hearth furnace...

3. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _____________ °C for 24 hours?

   A. 700 B. 1000 C. 1600 D. 2000...

4. At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant ?

   A. 273°C B. 273°K C. 100°C D. 200°C...

5. A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

   A. 0°C B. 0°K C. -136.5°C D. -136.5°K...

6. If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

   A. The solvent begins to freeze out even before B. It will undergo no change until C. It will not solidify even on D. None of these...

7. With increase in the porosity, thermal spalling resistance of fireclay brick_______________?

   A. Increases B. Decreases C. Remain same D. May increase or decrease...

8. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?

   A. Decrease in mean free path B. Increased collision rate among molecules C. Increase in molecular attraction D. Increase in average molecular speed...

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

   A. Beryllia B. Carborundum C. Corundum D. Thoria...

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

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