A. Removal of water of hydration
B. Vitrification
C. Decrease in crushing strength
D. Development of stable mineral form
Related Mcqs:
- Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
A. 10
B. 15
C. 20
D. 30 - Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C. - The maximum linear expansion of silica bricks during firing is about ______________ percent?
A. 0.5
B. 1
C. 2
D. 3.5 - Firing of refractory brick is done to __________________?
A. Dehydrate the dried refractory
B. Develop stable mineral forms in them
C. Form ceramic bonds necessary for development of high crushing strength in the finished
product
D. All A., B. and C. - Firing temperature of magnesite bricks is about _____________ °C?
A. 800-1000
B. 1000-1200
C. 1600-1800
D. 2400-2600 - Firing temperature is minimum (1250-1400 °C) for _______________ bricks?
A. Fireclay
B. Direct bonded basic
C. Silica
D. Magnesite - An indication of degree of firing in silica brick is its____________________?
A. Specific gravity
B. Fusion point
C. RUL
D. None of these - Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
A. Soaking pits
B. Reheating furnace
C. L.D. converter
D. Rotary lime kiln - ______________ bricks are used in the burning zone of a cement rotary kiln ?
A. High alumina
B. Fireclay
C. Thoria
D. Silicon carbide - Fireclay refractories have __________________?
A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost
