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Question: In the Bayer’s process, bauxite is digested under pressure using
[A].

H2SO4

[B].

NaOH

[C].

NH3

[D].

HCl

Answer: Option B

Explanation:

No answer description available for this question.

Question: Cadmium in zinc leach liquor is removed by cementation using
[A].

zinc

[B].

iron

[C].

nickel

[D].

copper

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the floatation process, pine oil is used as the
[A].

collector

[B].

activator

[C].

frother

[D].

depressant

Answer: Option C

Explanation:

No answer description available for this question.

Question: A pipeline buried in soil is commonly protected from corrosion by
[A].

anodic protection.

[B].

cathodic protection.

[C].

using inhibitors.

[D].

using a special alloy resistant to corrosion.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mechanism/phenomenon involved in the improvement of fatigue strength of a material by shot peening is the
[A].

induction of residual compressive stress on the surface.

[B].

removal of stress concentration from the surface.

[C].

grain refinement.

[D].

surface polishing.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Grain hardness is measured by the __________ hardness testing method.
[A].

Knoop

[B].

Rockwell F

[C].

Shore sceleroscope

[D].

Vicker’s

Answer: Option A

Explanation:

No answer description available for this question.

Question: Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.
[A].

Vicker’s

[B].

Rockwell

[C].

Knoop

[D].

Brinell

Answer: Option B

Explanation:

No answer description available for this question.

Question: Brinell hardness number (BHN) of a material is a number, which has
[A].

no dimension.

[B].

unit of length.

[C].

unity of force/area.

[D].

unit of force/length.

Answer: Option C

Explanation:

No answer description available for this question.