Self supporting arches for furnace roofs can be fabricated using silica bricks but not using magnesia bricks. Why?
A. Silica has a significantly lower thermal expansion coefficient than magnesia at high temperatures
B. Silica has a significantly higher thermal conductivity than magnesia at high temperatures
C. Silica has a significantly lower melting point than magnesia
D. Silica is significantly more acidic than magnesia
Answer: Option A
This Question Belongs to Metallurgical Engineering >> Miscellaneous In Metallurgy
The extending the polymer chain by successive addition of monomers units is called
A. Propagation
B. Termination
C. Both A and B
D. None of these
If Reynolds number is greater than 1, then the
A. Viscous force is larger than the inertia force
B. inertia force is larger than the viscous force
C. inertia force is larger than the surface tension force
D. inertia force is larger than the gravitational force
Which is the correct (degree) temperature range for spherodized carbide in low carbon steel
A. 750-950°C
B. 950-1150°C
C. 550-750°C
D. None of these
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