Mechanical Engineering - Engineering Materials

16. 

The casting ability of aluminium increases when __________ is added to aluminium.

A. copper
B. magnesium
C. silicon
D. lead and bismuth

Answer: Option C

Explanation:

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17. 

Manganese bronze has

A. good wearing qualities and high elasticity
B. high yield point, high fatigue limit and excellent cold and hot corrosion resistance
C. high resistance to corrosion
D. valuable cold working property

Answer: Option C

Explanation:

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18. 

A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as

A. normalising
B. annealing
C. austempering
D. martempering

Answer: Option C

Explanation:

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19. 

Silicon bronze contains

A. 60% copper, 35% zinc and 5% manganese
B. 88% copper, 10% tin and 2% zinc
C. 96% copper, 3% silicon and 1% manganese
D. 76% copper, 20% silicon and 4% zinc

Answer: Option C

Explanation:

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20. 

In acidic bessemer process, the furnace is lined with

A. silica bricks
B. a mixture of tar and burnt dolomite bricks
C. either (a) or (b)
D. none of these

Answer: Option A

Explanation:

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