Materials and Construction

411. Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a

1. Cermet
2. Glass
3. Thermosetting plastic
4. Metallic alloy

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412. Water gas generator is made of

1. Carbon steel-brick lined
2. Stainless steel-lead lined
3. Cast iron
4. High carbon steel-porcelain lined

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413. When iron is rusted, it is

1. Converted to a fine powder
2. Reduced
3. Oxidised
4. None of these

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414. When the steel is subjected to normalising, its _________ decreases.

1. Yield point
2. Ductility
3. Ultimate tensile strength (UTS)
4. None of these

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415. Which has the maximum melting point out of the following?

1. Steel
2. Cast iron
3. Stainless steel
4. Wrought iron

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416. Which is an amorphous material?

1. Glass
2. Mica
3. Brass
4. Cast iron

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417. Which is the purest form of iron?

1. Wrought iron
2. Pig iron
3. Bessemer iron
4. Grey iron

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418. Which metal is protected by the layer of its own oxide?

1. Iron
2. Silver
3. Calcium
4. Aluminium

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419. Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

1. Silicon steel
2. Chromium steel
3. Molybdenum steel
4. None of these

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420. Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

1. Tungsten steel
2. Molybdenum steel
3. Nickel-chrome steel
4. Cobalt steel

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