Refractory Technology - Part 1 Online Exam Quiz
Refractory Technology - Part 1 GK Quiz. Question and Answers related to Refractory Technology - Part 1. MCQ (Multiple Choice Questions with answers about Refractory Technology - Part 1
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
Options
A : non-wetting characteristic.
B : high thermal conductivity.
C : high crushing strength.
D : none of these.
Firing temperature of magnesite bricks is about __________ °C.
Options
A : 800-1000
B : 1000-1200
C : 1600-1800
D : 2400-2600
Hollow refractory bricks are made by
Options
A : slip casting
B : hand moulding
C : pressing/machine moulding
D : extrusion
Quartz is
Options
A : stable form of silica upto 870°C.
B : converted to tridymite on firing between 870 to 1470°C.
C : transformed to crystoballite on heating above 1470°C.
D : all (a), (b) and (c).
An indication of degree of firing in silica brick is its
Options
A : specific gravity
B : fusion point
C : RUL
D : none of these
Panel test determines the __________ of refractories.
Options
A : fusion point
B : spalling resistance
C : slag penetration resistance
D : refractoriness under load (RUL)
Fireclay bricks are not used in the
Options
A : beehive coke oven.
B : by-product coke oven walls.
C : combustion chamber of B.F. stoves.
D : coke oven regenerators.
Fusion point of a basic refractory material is
Options
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.
RUL of refractories depends on the
Options
A : chemical composition.
B : physical structure.
C : presence of impurities like iron & alkali.
D : all (a), (b) and (c).
Which is the stable form of silica between 1470°C and the melting point 1713°C ?
Options
A : Cristobalite
B : Tridymite
C : Quartz
D : None of these
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