Chemical Engineering - Chemical Engineering Basics

26. 

Dephosphorisation of molten pig iron is favoured by

A. oxidising and basic slag.
B. reducing and basic slag.
C. high activity co-efficient of phosphorous in metal.
D. oxidising and neutral slag.

Answer: Option B

Explanation:

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27. 

In a neutral solution

A. H+ ions are absent.
B. OH- ions are absent.
C. both H+ and OH- ions are present in very small but equal concentration.
D. none of these.

Answer: Option C

Explanation:

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28. 

Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

A. Admirability brass.
B. Stainless steel.
C. Aluminium brass.
D. Titanium.

Answer: Option B

Explanation:

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29. 

Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

A. fracture
B. dislocation
C. slip
D. twinning

Answer: Option C

Explanation:

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30. 

A common disinfectant used in village wells for disinfection of water is

A. free chlorine
B. bromine
C. iodine
D. potassium permanganate

Answer: Option D

Explanation:

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