Materials and Construction

1. 'Age hardening' of duralumin is due to

1. Copper
2. Magnesium
3. Both (A) & (B)
4. Neither (A) nor (B)

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2. 'Hypersil' is a _________ steel.

1. High speed
2. Silicon
3. Molybdenum
4. Tungsten

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3. 'Semi steel' is

1. Produced by adding 10-20% steel to the cupola charge
2. Stronger than cast iron
3. Both (A) and (B)
4. Neither (A) nor (B)

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4. _________ alloys have the highest specific strength of all the structural materials out of the following.

1. Magnetic steel
2. Titanium
3. Chromium
4. Magnesium

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5. _________ can replace tungsten in high speed steel,

1. Chromium
2. Vanadium
3. Cobalt
4. Molybdenum

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6. _________ does not contain copper as an alloying element,

1. Nichrome
2. Manganin
3. Perminvar
4. Monel metal

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7. _________ does not contain tin as an alloying material.

1. Brass
2. Pewter
3. Solder
4. Babbitt metal

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8. _________ iron is produced, when molten pig iron is allowed to cool gradually.

1. White cast
2. Grey cast
3. Wrought
4. None of these

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9. _________ iron is produced, when molten pig iron is chilled suddenly.

1. White cast
2. Grey cast
3. Wrought
4. None of these

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10. _________ is a donor impurity for semi-conductors.

1. Boron
2. Antimony
3. Gallium
4. None of these

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