increases with rise in service temperature.
decreases with rise in service temperature.
is unaffected with change in service temperature.
decreases with increase in porosity.
✅ The correct answer is option B.
Engineering
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3112. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
fireclay
carborundum
graphite
chromite
✅ The correct answer is option C.
3113. With increase in the alumina content in firebricks, its fusion point (refractoriness)
decreases linearly
remains unchanged
increases
decreases
✅ 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.
3115. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Beryllia
Carborundum
Corundum
Thoria
✅ The correct answer is option A.
3116. Which of the following bricks has the most close values of RUL and PCE ?
Silica bricks
Fireclay bricks
High alumina bricks
Tar dolomite bricks
✅ The correct answer is option A.
3117. Fireclay bricks is not used for lining the
cupola.
gas producer.
bottom of hot metal mixer.
roof of open hearth furnace.
✅ The correct answer is option C.
3118. Which is the stable form of silica upto 1470°C ?
Quartz
Cristobalite
Tridymite
None of these
✅ The correct answer is option C.
3119. An ideal refractory should have high
spalling rate
fusion point
shrinkage ability
none of these
✅ The correct answer is option B.
3120. Which is a basic refractory ?
Fireclay
Silica
Chrome magnesite
None of these
✅ The correct answer is option C.