Chemical Engineering - Materials and Construction

36. 

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

A. 1.5-2
B. 3.5-4.5
C. 7-9
D. 12-14

Answer: Option D

Explanation:

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37. 

White cast iron is not

A. malleable
B. whitish in color
C. brittle
D. strong and hard

Answer: Option A

Explanation:

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38. 

Galvanised iron is

A. harder
B. protected from rusting
C. alumina coated iron
D. none of these

Answer: Option B

Explanation:

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39. 

German silver used for decorative purposes contains maximum percentage of

A. silver
B. copper
C. zinc
D. nickel

Answer: Option B

Explanation:

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40. 

The metals occuring at the lower most position in the electromotive series

A. do not resist corrosion.
B. resist corrosion very strongly.
C. are very brittle.
D. are heat insulators.

Answer: Option B

Explanation:

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