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.Management Sciences
Category: Refractory Technology
Segar cones are used for the determination of ____________ of refractories?
A. Softening temperature
B. Spalling resistance
C. Electrical conductivity
D. Resistance to slag attack
Which is not an alumino-silicate refractory ?
A. Fireclay bricks
B. Mullite bricks
C. Tar dolomite bricks
D. High alumina bricks
Firing temperature of magnesite bricks is about _____________ °C?
A. 800-1000
B. 1000-1200
C. 1600-1800
D. 2400-2600
Magnesite bricks are used in those parts of furnaces, which are __________________?
A. Subjected to temperature fluctuation
B. Required to resist corrosive basic slag
C. Subjected to high load
D. None of these
With increase in the alumina content in firebricks, its fusion point (refractoriness) ?
A. Decreases linearly
B. Remains unchanged
C. Increases
D. Decreases
Which of the following bricks should not be used, if the furnace is to be used intermittently ?
A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite
Electrical resistor bars are made of _______________?
A. Silicon carbide
B. Alumina
C. Zirconia
D. Graphite
Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
A. High duty fireclay
B. Silica
C. Mullite
D. Carborundum
Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
A. Spalling resistance
B. Fusion point
C. Resistance to slag penetration
D. Resistance to carbon monoxide attack
Thermal spalling mainly occurs during _____________ of furnaces?
A. Cooling down
B. Warming up
C. Both A. & B.
D. Neither A. nor B.
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