Materials and Construction

131. Cold work tool steel should have

1. High toughness
2. Poor hardenability
3. High wear resistance
4. All (A), (B) & (C)

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132. Cold worked steel parts are normally subjected to

1. Normalising
2. Hardening
3. Annealing
4. Shot peening

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133. Combination of metals and ceramics are called

1. Metalloy
2. Cermets
3. Pellets
4. Non-crystalline ceramics

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134. Common house hold glass (i.e., soda-lime glass) is a/an _________ material.

1. Fully crystalline
2. Partly crystalline
3. Amorphous
4. None of these

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135. Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

1. Half
2. One third
3. One fifth
4. One twelfth

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136. Concentrated HCl at 30°C can be stored in a vessel made of

1. PTFE and porcelain
2. Cast iron and aluminium
3. Stainless steel and high silicon cast iron
4. None of these

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137. Concrete tank can be used to store

1. Alum
2. Ferrous sulphate
3. Sulphuric acid
4. Saturated brine

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138. Condenser tubes are not made of

1. Cartridge brass
2. Muntz brass
3. Wood metal
4. Aluminium brass alloy

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139. Constantan is an alloy of

1. Cu (55%) & Sn (45%)
2. Cu (55%) & Ni (45%)
3. Pt (95%) & Rh (10%)
4. Fe (80%) & Ni (20%)

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140. Constantan used in thermocouples is an alloy of

1. Iron & copper
2. Copper & aluminium
3. Lead & tin
4. None of these

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