Materials and Construction

121. Ceramic recuperators are generally made of

1. Silicon carbide
2. Calcium carbide
3. Fireclay bricks
4. High alumina bricks

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122. Cermets are _________ materials.

1. Refractory
2. Reinforced
3. Abrasive
4. Fully metallic

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123. Cermets are used for making

1. Cutting tools
2. Abrasives
3. Both (A) & (B)
4. Neither (A) nor (B)

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124. Chilled iron castings are

1. Easily machinable
2. Soft on surface
3. Highly wear resistant
4. None of these

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125. Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

1. Karbate
2. Lead or glass
3. Fireclay bricks
4. PVC

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126. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is

1. Used for making axle & shafts of aeroplanes, automobiles and locomotives
2. Having poor fatigue resistance
3. Having poor toughness
4. Not helpful in producing cleaner steel due to oxidising action of vanadium

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127. Chromel (Nichrome) is an alloy of

1. Chromium and molybdenum
2. Nickel and chromium
3. Molybdenum and nickel
4. Chromium and aluminium

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128. Clock pendulums are usually made of _________ steel.

1. High speed
2. Stainless
3. Heat resisting
4. None of these

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129. Coke oven regenerators are made of _________ bricks.

1. Fire clay
2. Silica
3. Low thermal conductivity
4. High electrical conductivity

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130. Coke oven walls are lined with _________ bricks.

1. Silica
2. Tar-dolomite
3. Low thermal conductivity
4. Fire clay

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