Question is ⇒ Pyrometric cone equivalent (PCE) of a refractory is the measure of its, Options are ⇒ (A) spalling resistance., (B) fusion point., (C) resistance to slag penetration., (D) resistance to carbon monoxide attack., (E) , Leave your comments or Download question paper.

Question is ⇒ Pyrometric cone equivalent (PCE) of a refractory is the measure of its, Options are ⇒ (A) spalling resistance., (B) fusion point., (C) resistance to slag penetration., (D) resistance to carbon monoxide attack., (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Pyrometric cone equivalent (PCE) of a refractory is the measure of its
A.	spalling resistance. [Wrong Answer]
B.	fusion point. [Correct Answer]
C.	resistance to slag penetration. [Wrong Answer]
D.	resistance to carbon monoxide attack. [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Carbon bricks are not used in the lining of the
combustion chamber of blast furnace stoves.
electric furnaces.
highly chemical resistant equipments.
blast furnace hearth.

⇒ Which furnace consumes maximum refractory annually in an integrated steel plant ?
Soaking pit
Blastfurnace
L.D. converter
Coke ovens

⇒ __________ nozzles are used in continuous casting of steel,
Zircon
Thoria
Carborundum
Beryllia

⇒ Which property of refractories is the most important for top section of the blast furnace?
Resistance to abrasion.
Resistance to slag peneration.
Stability of volume at high temperature.
Resistance to corrosion by slag.

⇒ Silica bricks are never used for lining the
beehive coke ovens.
by-product coke ovens.
dome of blast furnace stoves.
roof of open hearth furnace.

⇒ Cold crushing strength of refractories depends upon its
composition
texture
firing temperature
all (a), (b) and (c)

⇒ Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.
500
1000
>1350
>2000

⇒ Chemically, mullite refractories is
3Al₂O₃.2SiO₂
Al₂O₃
ZrSO₄
ThO₂

⇒ An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
Cork
Saw dust
Sand
Chemically prepared foam

⇒ Fusion point of a basic refractory material is
reduced by the addition of acid oxides.
increased by the addition of acid oxides.
not affected by the addition of acid oxides.
always less than 1000°C.

⇒ Cold crushing strength of fireclay bricks is about __________ kgf/cm².
50-100
100-150
200-400
500-1000

⇒ Ferromagnetic ceramic material is not used in the
thermal insulation
transformers
magnetic switches
television sets

⇒ Alumina-graphite bricks are used for lining the
slide gate in teeming laddies.
continuous casting systems.
both (a) and (b).
neither (a) nor (b).

⇒ Silicon carbide refractories have very low
refractoriness (< 1700°C).
thermal conductivity.
resistance to thermal shock.
none of these.

⇒ Chromite refractories are used in
bottom of soaking pits.
between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other.
both (a) & (b)
neither (a) and (b)

⇒ Carbon refractories are exclusively used in the
hearth of blast furnace.
walls of coke oven.
regenerators of coke oven.
side wall of soaking pits.

⇒ Pick out the wrong statement.
Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
Graphite refractories are also called plumbago refractories.
Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
Calcined magnesite is also called dead burnt magnesite.

⇒ Pick out the wrong statement.
Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators.
Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity.
Electrical conductivity of porous refractory material is low.

⇒ Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
fireclay
carborundum
graphite
chromite

⇒ Magnesite refractories have low resistance to
attack by basic slag.
abrasion.
disintegration on sudden change of temperature.
both (b) and (c).

⇒ High refractorinness of refractory bricks means, that it has a
high spalling resistance.
low spalling resistance.
high resistance to fusion.
low porosity.

⇒ Which is the stable form of silica upto 1470°C ?
Quartz
Cristobalite
Tridymite
None of these

⇒ Refractory bricks having lower porosity have
high insulating properties
low heat capacity
low thermal conductivity
greater strength

⇒ 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
spalling resistance
refractoriness
crushing strength
resistance to slag

⇒ Porosity of fireclay refractories is __________ percent.
42865
43033
25-35
35-50

⇒ Carbon refractory blocks
are wetted by molten iron.
are used in the hearth of blast furnace.
are acidic in nature.
all (a), (b) and (c).

⇒ Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
non-wetting characteristic.
high thermal conductivity.
high crushing strength.
none of these.

⇒ Spalling tendency of refractories is reduced by increasing its
porosity
specific gravity
thermal conductivity
strength

⇒ Periclase is
crystalline form of MgO.
MgCO₃.
ZrSO₄.
amorphous magnesite.

⇒ Firing temperature of magnesite bricks is about __________ °C.
800-1000
1000-1200
1600-1800
2400-2600