Highest melting (m.p = 3070�C) oxide refractory is alumina thoria zirconia magne

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Question
Highest melting (m.p = 3070�C) oxide refractory is
Options
A. alumina
B. thoria
C. zirconia
D. magnesia

Correct Answer

thoria

Refractory Technology problems

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1. An ideal refractory should have high
Options
A. spalling rate
B. fusion point
C. shrinkage ability
D. none of these

Discuss

Correct Answer: fusion point

2. With decrease in porosity, the __________ of the refractories decreases.
Options
A. strength
B. thermal conductivity
C. spalling resistance
D. none of these

Discuss

Correct Answer: spalling resistance

3. Zirconia refractories are not used in
Options
A. making sheaths for thermocouple.
B. lining high temperature ceramic kilns.
C. furnaces subjected to fluctuating temperature.
D. high frequency induction furnaces in the form of inductors.

Discuss

Correct Answer: furnaces subjected to fluctuating temperature.

4. Which one contains minimum percentage of SiO₂?
Options
A. Firebrick
B. Sillimanite
C. Semi-silica
D. Aluminous firebrick

Discuss

Correct Answer: Sillimanite

5. Porosity of fireclay refractories is __________ percent.
Options
A. 5-10
B. 10-25
C. 25-35
D. 35-50

Discuss

Correct Answer: 10-25

6. SiO₂ percentage in firebrick is about
Options
A. 35-40
B. 55-60
C. 80-85
D. >94

Discuss

Correct Answer: 55-60

7. Maximum apparent porosity of magnesite bricks is about __________ percent.
Options
A. 8
B. 24
C. 44
D. 58

Discuss

Correct Answer: 24

8. Mullite is chemically represented by
Options
A. Al₂O₃ . 2SiO₂
B. 3Al₂O₃ . 2SiO₂
C. Al₂O₃ . SiO₂
D. 2Al₂O₃ . 3SiO₂

Discuss

Correct Answer: 3Al₂O₃ . 2SiO₂

9. Graphite or carbon refractories
Options
A. exihibit wetting characteristics.
B. should be used in neutral or reducing atmosphere.
C. exhibit high shrinkage on thermal treatment.
D. are not resistant to corrosion by slag.

Discuss

Correct Answer: should be used in neutral or reducing atmosphere.

10. Dilatometer is used for the determination of __________ of refractories.
Options
A. modulus of rupture
B. permanent linear change
C. resistance to CO attack
D. RUL

Discuss

Correct Answer: permanent linear change

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