Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 16
| 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:
|
| 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:
|
| 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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