Insulating refractories should have_______________?

Related Mcqs:

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...

Thermal spalling mainly occurs during _____________ of furnaces?

A. Cooling down B. Warming up C. Both A. & B. D. Neither A. nor B....

Silica refractories are not used in _________________?

A. Coke oven walls B. Beehive coke ovens C. Dome and upper portion of B.F. stoves D. Open hearth furnace roof...

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...

Permeability of bricks is a measure of the_________________?

A. Refractoriness B. Melting point C. Rate at which a fluid will pass through the pores D. Expansion during heating...