Chemical Engineering - Refractory Technology

1. 

The main raw material for manufacture of silicon carbide refractories is

A. corrundum
B. carborundum
C. bauxite
D. periclase

Answer: Option B

Explanation:

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2. 

Chromite refractories are used in

A. bottom of soaking pits.
B. between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other.
C. both (a) & (b)
D. neither (a) and (b)

Answer: Option C

Explanation:

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3. 

Which of the following has the lowest electrical resistivity ?

A. Graphite
B. Fireclay
C. Alumina
D. Zircon

Answer: Option A

Explanation:

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4. 

Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory

A. mortars
B. cements
C. castables
D. none of these

Answer: Option C

Explanation:

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5. 

Silica bricks have low spalling resistance below 600°C, due to its

A. very high thermal conductivity.
B. high co-efficient of expansion upto this temperature.
C. high thermal diffusivity.
D. low refractoriness.

Answer: Option B

Explanation:

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