Which of the following has the lowest electrical resistivity ?

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...

SiO2 percentage in firebrick is about____________________?

A. 35-40 B. 55-60 C. 80-85 D. > 94...

The main raw material for manufacture of silicon carbide refractories is_________________?

A. Corundum B. Carborundum C. Bauxite D. Periclase...

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...

Fusion point of a basic refractory material is__________________?

A. Reduced by the addition of acid oxides B. Increased by the addition of acid oxides C. Not affected by the addition of acid oxides D. Always less than 1000°C...