Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?

Related Mcqs:

1. 10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?

   A. Spalling resistance
   B. Refractoriness
   C. Crushing strength
   D. Resistance to slag

2. Bauxite calcining rotary kilns are lined with ________________ bricks?

   A. Fireclay
   B. Carbon
   C. 85% alumina
   D. Corundum

3. Chrome magnesite bricks are_________________?

   A. Acidic in nature
   B. Neutral in nature
   C. Having higher RUL than silica bricks
   D. Made by mixing 30% Chromite and 70% Periclase

4. Chrome magnesite is not used in the ____________________?

   A. Inner lining of L.D. converter
   B. Aluminium melting furnaces
   C. Wear out lining of steel melting furnaces
   D. All A., and B. and C.

5. Chrome magnesite bricks are used in the_________________?

   A. Side walls of soaking pits and arc furnaces
   B. Copper melting furnaces & converters
   C. Burner block of glass tanks
   D. All A., B. and C.

6. Magnesite chrome bricks are used in the___________________?

   A. Roof lining of basic open hearth & other basic furnaces
   B. Reheating furnaces
   C. Soaking pits
   D. All A., B. and C.

7. Chrome magnesite brick is not used for lining the___________________?

   A. Hearth of soaking pits
   B. Bottom hearth of reheating furnace
   C. Coke oven regenerator
   D. Burning zone of limestone rotary kilns

8. Magnesite chrome refractories____________________?

   A. Have better spalling resistance than chrome magnesite refractories
   B. Have very low thermal co-efficient of expansion
   C. Are not at all resistant to the corrosive action of iron oxide
   D. Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase
   form

9. ______________ bricks are used in the burning zone of a cement rotary kiln ?

   A. High alumina
   B. Fireclay
   C. Thoria
   D. Silicon carbide

10. 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