Materials and Construction

311. Refined acetic acid storage vessel are made of

1. Copper
2. Aluminium
3. High carbon steel
4. Nickel

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312. Residual magnetism in steel for magnets is increased by the addition of

1. Nickel
2. Cobalt
3. Tungsten
4. Chromium

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313. Rotary driers are generally made of

1. Cast iron
2. Mild steel
3. High silicon iron (14% Si)
4. Tin lined with refractory bricks

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314. Rotary kilns in cement industry are lined with _________bricks.

1. Fireclay
2. Silica
3. Lead
4. High alumina & high magnesia

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315. Rubber lined pumps can be used to pump

1. Caustic soda
2. Chlorinated brine
3. Hypochlorous acid
4. All (A), (B) and (C)

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316. Rubber lined vessels are corroded by the action of

1. Aqua regia
2. Chloroform
3. Sulphuric acid (95%)
4. All (A), (B) and (C)

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317. Sherardizing process is used for

1. Surface coating
2. Heat treatment of high speed steel
3. Cold working on metals
4. None of these

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318. Shock resisting steels should possess high

1. Hardness
2. Toughness
3. Tensile strength
4. Wear resistance

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319. Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)

1. Do not require heat treatment for any of its applications
2. Are used for leaf and coiled springs
3. Do not have good resilience properties
4. Is tempered at 850°C

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320. Silicon percentage in acid resistant cast iron is about

1. 4
2. 8
3. 14
4. 20

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