Chemical Engineering - Chemical Engineering Basics

31. 

Addition of __________ to steel does not help in improving its machinability.

A. sulphur
B. silicon
C. lead
D. phosphorous

Answer: Option B

Explanation:

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32. 

Chalcopyrite is an ore of

A. lead
B. aluminium
C. copper
D. zinc

Answer: Option C

Explanation:

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33. 

The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks.

A. Iron
B. Copper
C. Nickel
D. Magnesium

Answer: Option D

Explanation:

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34. 

Heat transfer by __________ is almost absent in case of fluidised bed drying operation.

A. radiation
B. conduction
C. convection
D. both (b) & (c)

Answer: Option A

Explanation:

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35. 

Increasing the carbon content of steel

A. reduces the upper shelf energy.
B. increasing the ductility transition temperature.
C. decreases brittleness.
D. decreases hardness.

Answer: Option B

Explanation:

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