Mechanical Engineering - Engineering Materials

31. 

Admirality gun metal contains

A. 60% copper, 35% zinc and 5% manganese
B. 76% copper, 20% silicon and 4% zinc
C. 82% copper, 12% zinc and 6% manganese
D. 88% copper, 10% tin and 2% zinc

Answer: Option D

Explanation:

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32. 

The percentage of phosphorus is phosphor bronze is

A. 0.1
B. 1
C. 11.1
D. 98

Answer: Option A

Explanation:

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33. 

In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.

A. True
B. False

Answer: Option A

Explanation:

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34. 

For the pipe fitting like elbow, tee, union etc., which of the following is preferred?

A. Pig iron
B. Malleable iron
C. Spheroidal graphite cast iron
D. High carbon steel

Answer: Option B

Explanation:

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35. 

Chilled cast iron is produced

A. by adding magnesium to molten cast iron
B. by quick cooling of molten cast iron
C. from white cast iron by annealing process
D. none of these

Answer: Option B

Explanation:

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