3133. Colour of fireclay bricks is
light buff to reddish buff
yellow
black
none of these
✅ The correct answer is option A.
3138. Panel test determines the __________ of refractories.
fusion point
spalling resistance
slag penetration resistance
refractoriness under load (RUL)
✅ The correct answer is option B.
3103. Dolomite bricks have good resistance to attack by
molten steel
iron oxide
lime slag
none of these
✅ The correct answer is option A.
3108. Thermal diffusivity of a refractory brick is high, when its __________ is high.
density
specific heat
thermal conductivity
none of these
✅ The correct answer is option C.
3114. Cold crushing strength of a refractory does not depend upon its
shape
composition
firing temperature
texture
✅ The correct answer is option A.
3120. Which is a basic refractory ?
Fireclay
Silica
Chrome magnesite
None of these
✅ The correct answer is option C.
3125. With increase in the alumina content, the refractoriness of high alumina refractories
increases
decreases
remains same
may increase or decrease
✅ The correct answer is option A.
3129. Refractories used in/for __________ should have low thermal conductivity.
coke ovens
insulation
regenerators
muffle furnaces
✅ The correct answer is option B.
3134. Refractoriness under load (RUL) is the most important property for the refractory bricks
at the hearth bottom of the furnace on which stock is placed.
used for furnace insulation.
used in the roof of the furnace.
none of these.
✅ The correct answer is option A.
3139. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
10
100
500
1000
✅ The correct answer is option D.