Chemical Engineering - Chemical Engineering Basics

26. 

Addition of silicon to cast iron

A. promotes graphite module formation.
B. improves its ductility.
C. does not promote graphite flakes formation.
D. increases the fluidity of molten metal.

Answer: Option D

Explanation:

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27. 

Lead is poured into the joint between two __________ pipes.

A. mild steel
B. concrete
C. cast iron
D. asbestos cement

Answer: Option C

Explanation:

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28. 

About __________ ton of coke is required in a cupola to produce one ton of casting.

A. 0.03
B. 0.3
C. 0.8
D. 1.5

Answer: Option B

Explanation:

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29. 

There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

A. one
B. two
C. three
D. none of these

Answer: Option B

Explanation:

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30. 

Which of the following is prone to cup and cone fracture ?

A. Cast iron
B. Soft brass
C. Round specimen of ductile metal.
D. Flat tensile specimen of ductile metal.

Answer: Option C

Explanation:

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