Materials and Construction

460. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?

1. Invar
2. Constantan
3. Chromel
4. Alumel

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461. Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system?

1. High silicon iron, silicon rubber, Kel-F and Teflon
2. Mild steel and stainless steel
3. Cast iron, tin and aluminium
4. Copper, nickel and Monel

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462. Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

1. Silicone rubber, teflon, porcelain and wood
2. Nickel, monel, stainless steel and graphite
3. Aluminium, copper, high silicon iron
4. Brass, cast iron, mild steel and tin

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463. Which of the following metals in not used for coating of the base metal to guard it against corrosion?

1. Lead
2. Cadmium
3. Magnesium
4. Aluminium

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464. Which of the following pairs of elements may form an alloy?

1. Iron & carbon
2. Iron & mercury
3. Platinum & mercury
4. None of these

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465. Which of the following stainless steels is non-magnetic?

1. Ferritic
2. Martenistic
3. Austenitic
4. None of these

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466. Which of the following undergoes granular fracture?

1. Wrought iron
2. Steel
3. Cast iron
4. None of these

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467. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C?

1. Monel
2. Stainless steel
3. Graphite
4. Kel-F and Teflon

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468. Which one contains the least percentage of carbon?

1. Wrought iron
2. High speed steel
3. Cast iron
4. Pig iron

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469. Which one has the maximum tensile strength out of the following?

1. Nodular cast iron
2. Pig iron
3. White cast iron
4. Grey cast iron

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470. Which one is remelted and poured into moulds to get cast iron?

1. Wrought iron
2. Pig iron
3. Low carbon steel
4. Mild steel

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