With increase in the alumina content in firebricks, its fusion point (refractoriness)

With increase in the alumina content, the refractoriness of high alumina refractories

A

Increases

B

Decreases

C

Remains same

D

May increase or decrease

With increasing alumina content, the fusion point of high alumina refractories

A

Increases

B

Decreases

C

Remains constant

D

May increase or decrease ; depends on its alumina content

Maximum alumina content in high alumina refractory can be as high as __________ percent.

A

30

B

50

C

70

D

90

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

A

55

B

70

C

80

D

90

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

A

Fireclay

B

Silica

C

Dolomite

D

Very low alumina

Refractoriness/fusion points of 'superduty' refractories is __________ °C.

A

1520-1630

B

1630-1670

C

> 1730

D

> 2000

Fusion of bauxite and __________ produces high alumina cement.

A

Alum

B

Limestone

C

Coke

D

Quartz

Fusion of limestone and __________ produces high alumina cement.

A

Sand

B

Bauxite

C

Quicklime

D

Calcite

Fusion point of coal ash increases with increase in its __________ content.

A

Iron sulphate

B

Iron silicate

C

Lime and magnesia

D

All of the above

Presence of MgO in alumino-silicate refractories __________ its refractoriness.

A

Increases

B

Lowers

C

Does not affect

D

Either A or B; depends on its quantity

With increase in the alumina content in firebricks, its fusion point (refractoriness)

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