chemical engineering refractory technology MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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
81. Bauxite calcining rotary kilns are lined with ________________ bricks?
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A. 85% alumina

B. Corundum

C. Fireclay

D. Carbon

82. Spalling tendency of refractories is reduced by increasing its_________________?
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A. Strength

B. Porosity

C. Specific gravity

D. Thermal conductivity

83. With increase in the alumina content in firebricks, its fusion point (refractoriness) ?
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A. Increases

B. Decreases linearly

C. Remains unchanged

D. Decreases

84. Silica bricks have low spalling resistance below 600C, due to its________________?
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A. Very high thermal conductivity

B. High co-efficient of expansion upto this temperature

C. High thermal diffusivity

D. Low refractoriness

85. With increase in the alumina content, the refractoriness of high alumina refractories_______________?
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A. Decreases

B. Remain same

C. Increases

D. May increase or decrease

86. Segar cones are used for the determination of ____________ of refractories?
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A. Resistance to slag attack

B. Spalling resistance

C. Softening temperature

D. Electrical conductivity

87. Cold crushing strength of a refractory does not depend upon its ____________________?
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A. Shape

B. Firing temperature

C. Composition

D. Texture

88. In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?
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A. 60

B. 40

C. 20

D. 80

89. Which of the following has the lowest electrical resistivity ?
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A. Graphite

B. Zircon

C. Fireclay

D. Alumina

90. Magnesite chrome bricks are used in the___________________?
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A. All A., B. and C.

B. Soaking pits

C. Reheating furnaces

D. Roof lining of basic open hearth & other basic furnaces

91. Refractory castables are used for__________________?
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A. Patch work

B. All A., B. and C.

C. Producing monolithic linings

D. Minimising the number of joints in the structure

92. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?
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A. Insulation of high temperature furnaces

B. Hearth of the blast furnace

C. Nuclear reactors, missiles & space crafts

D. Roof of electric furnaces

93. Pyrometric cone equivalent (PCE) value (Segar cone) of Superduty refractories is more than 33 which corresponds to a temperature of _____________ C?
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A. 1630

B. 1730

C. 1670

D. 1520

94. ______________ bricks are used in the burning zone of a cement rotary kiln ?
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A. Fireclay

B. Thoria

C. Silicon carbide

D. High alumina
95. Dolomite bricks have good resistance to attack by_____________________?
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A. Molten steel

B. None of these

C. Iron oxide

D. Lime slag

96. Tar dolomite bricks are used in the_________________?
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A. Basic open hearth furnace

B. Basic Bessemer converter

C. Electric furnaces

D. All A., B. and C.
97. Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?
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A. 14-20

B. 7-May

C. 3-Feb

D. 12-Jul

98. The linear thermal expansion of _______________ bricks upto 1000 C is very low of the order of ? 0.5 percent?
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A. Fireclay

B. Corundum

C. Silica

D. Magnesite

99. Refractory materials are never used in the construction of _________________?
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A. Segar cones

B. Pressure vessels

C. Orton cones

D. Ovens & retorts

100. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?
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A. Silica

B. Semi-silica

C. Fireclay

D. Bakelite impregnated or fused periclase