Mechanical Engineering - Engineering Materials

11. 

The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.

A. True
B. False

Answer: Option A

Explanation:

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12. 

Muntz metal (Yellow brass) contains

A. 70% copper and 30% zinc
B. 60% copper and 40% zinc
C. 59% copper, 40% zinc and 1% tin
D. 60.45% copper, 35.2% zinc and 5.35% nickel

Answer: Option B

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13. 

Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

A. Diamond, Carbide, High speed steel
B. Carbide, Diamond, High speed steel
C. High speed steel, Carbide, Diamond
D. High speed steel, Diamond, Carbide

Answer: Option C

Explanation:

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14. 

The slag from the blast furnace

A. is used as a ballast for rail road
B. is mixed with tar for road making
C. consists of calcium, aluminium and ferrous silicates
D. all of the above

Answer: Option D

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15. 

Which of the following is a mesomorphous material?

A. Mica
B. Silver
C. Lead
D. Brass

Answer: Option A

Explanation:

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