Materials and Construction

191. Hardening of steel is not possible unless it is heated _________ critical point.

1. Above the highest
2. Above the lowest
3. Between the first & second
4. Between the second & third

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192. Hardest material so far found is

1. Diamond
2. Graphite
3. Carborundum
4. Pumice stone

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193. Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium

1. Tin, nickel, iron and chromium
2. And graphite
3. And copper
4. None of these

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194. Hastelloy C is a good material of construction in chemical process industry, since it is

1. Highly corrosion resistant and is readily fabricated
2. Relatively inexpensive although it can be fabricated with some difficulty
3. Corrosion resistant to most alkalis, particularly because of its copper content
4. Light and resists attack by acids

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195. Hastelloy comprises of

1. Copper and tin
2. Copper and nickel
3. Molybdenum and nickel
4. Lead and tin

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196. Heavy duty bearings are usually made of

1. White metal
2. Phosphorous bronze
3. Monel
4. Zinc

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197. High carbon steel contains more than _________ percent carbon.

1. 0.5
2. 2.2
3. 2.5
4. 2.8

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198. High degree of toughness is a must for

1. High speed steel
2. Shock resisting steel
3. Cold work tool steel
4. None of these

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199. High speed cutting tool steels contain about _________ percent of tungsten.

1. 44049
2. 18-20
3. 30-35
4. 50-55

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200. High speed steel should have high

1. Toughness
2. Wear resistance
3. Hardenability
4. Both (B) & (C)

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