Chemical Engineering - Materials and Construction

11. 

The main purpose of galvanising iron sheets is to

A. harden the surface.
B. increase its glossiness and lustre.
C. prevent the action of water.
D. prevent the action of oxygen.

Answer: Option C

Explanation:

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12. 

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

A. 0.2
B. 2
C. 4
D. 8

Answer: Option C

Explanation:

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13. 

Invar used in thermocouples is an alloy of nickel and

A. iron
B. copper
C. chromium
D. lead

Answer: Option A

Explanation:

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14. 

Nickel (56%) and molybdenum (17%) alloys are called

A. monel
B. hastealloy C
C. inconel
D. bronzes

Answer: Option B

Explanation:

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15. 

Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

A. dilute HCI
B. acetic acid
C. concentrated H2SO4
D. none of these

Answer: Option B

Explanation:

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