Materials and Construction

401. Titanium metal

1. Exists in three allotropic forms
2. Cannot be welded
3. Is used in oceanographic and space exploration applications
4. None of these

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402. To improve the machinability of steel by its softening, it is subjected to

1. Cold working
2. Annealing
3. Shot blasting
4. Heating

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403. To improve the machinability of steel, it is generally subjected to

1. Spheroidising
2. Tempering
3. Normalising
4. Annealing

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404. Trough of an apron conveyor is made of

1. Lead lined concrete vessel
2. Wood
3. Metal
4. Either (B) or (C)

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405. Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of

1. Nickel
2. Copper
3. Stainless steel
4. Brass

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406. Urea autoclave is made of

1. Cast iron
2. Refractory blocks
3. Stainless steel
4. Lead lined steel

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407. Valves in pipe size of 2" and under are normally made of

1. Wrought iron
2. Brass
3. Bronze
4. Monel

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408. Very high sulphur in pig iron makes

1. Its casting unsound
2. Its hard and machinable
3. Its brittle and malleable
4. All (A), (B) & (C)

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409. Vessels made of _________ can be used to store dry chlorine.

1. Thermoplastic materials
2. Nickel
3. Steel or iron
4. None of these

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410. Visco-elastic behaviour of materials which is time dependent is common in

1. Plastics
2. Crystalline solid
3. Non-crystalline solids
4. Non-crystalline organic polymer

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