Chemical Engineering - Chemical Engineering Basics

26. 

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:

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27. 

Springs are not made of

A. phospher bronze.
B. nickel steel.
C. monel.
D. carbon steel (c ≤ 0.5%).

Answer: Option D

Explanation:

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28. 

Pick out the wrong statement.

A. In Parke's process, zinc is added to remove silver from lead.
B. In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent.
C. Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace.
D. Pure copper electrodes are used as anode for electro-refinning of copper.

Answer: Option D

Explanation:

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29. 

Monazite deposits constitute an important source for the following metal.

A. Thorium
B. Titanium
C. Molybdenum
D. None of the above

Answer: Option A

Explanation:

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30. 

α-rays are

A. negatively charged.
B. positively charged.
C. neutral.
D. same as X-rays.

Answer: Option B

Explanation:

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