chemical engineering refractory technology MCQs – Page 6

Practise multiple-choice questions from chemical engineering refractory technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering refractory technology Mcqs
101. The largest consumer of refractories is the _______________ industry?
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A. Power

B. Fertiliser

C. Metallurgical

D. Cement

102. The main raw material for manufacture of silicon carbide refractories is_________________?
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A. Carborundum

B. Periclase

C. Corundum

D. Bauxite

103. Quartz is___________________?
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A. All A., B. and C.

B. Transformed to Cristobalite on heating above 1470C

C. Converted to Tridymite on firing between 870 to 1470C

D. Stable form of silica upto 870C

104. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
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A. Pottery furnace

B. Glass melting furnace

C. Gas retorts

D. Crucibles

105. RUL of refractories depends on the _____________________?
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A. All A., B. and C.

B. Chemical composition

C. Presence of impurities like iron & alkali

D. Physical structure

106. Vacuum steel degassing units are lined with__________________?
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A. Low duty firebricks

B. High alumina bricks

C. Graphite blocks

D. Silica bricks

107. Periclase is___________________?
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A. MgCO3

B. Crystalline form of MgO

C. ZrSO4

D. Amorphous magnesite

108. Fusion point of an acidic refractory material is________________?
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A. Increased by the addition of basic oxides

B. Not affected by the addition of basic oxides

C. Always more than 2500C

D. Reduced by the addition of basic oxides
109. Which one contains maximum percentage of Al2O3 ?
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A. Firebrick

B. Sillimanite

C. Aluminous firebrick

D. Magnesite

110. Which is not a basic refractory ?
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A. Dolomite

B. Chrome magnesite

C. Magnesite

D. Silicon carbide
111. Thermal spalling mainly occurs during _____________ of furnaces?
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A. Cooling down

B. Warming up

C. Both A. & B.

D. Neither A. nor B.

112. Super refractories are made from pure____________________?
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A. Borides

B. Oxides

C. Nitrides

D. Carbides

113. Which of the following is not a neutral refractory ?
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A. Magnesite

B. Chromite

C. Graphite

D. Silicon carbide

114. Ferromagnetic ceramic material is not used in the__________________?
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A. Magnetic switches

B. Transformers

C. Thermal insulation

D. Television sets

115. Chromite refractories are used in_______________?
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A. Bottom of soaking pits

B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action

C. h each other

D. Both A. & B.

E. Neither A. and B.

116. Which is required in an insulating refractory ?
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A. High thermal conductivity

B. Low porosity

C. Both A. and B.

D. Neither A. nor B.
117. Refractoriness of a typical silica brick corresponds to Segar cone number, 32, which is equivalent to a temperature of _____________ C?
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A. 1915

B. 1710

C. 1380

D. 1520

118. Chromite refractories are_____________________?
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A. Neutral refractory

B. Acidic refractory

C. Fired at a temperature of 600C only

D. Basic refractory

119. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500C, its crushing strength may come down to as low as ______________ kg/cm2?
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A. 250

B. 450

C. 65

D. 150

120. An indication of degree of firing in silica brick is its____________________?
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A. None of these

B. RUL

C. Specific gravity

D. Fusion point