Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 1
| 21. |
Powder metallurgy process does not make metal powder by |
| A. |
atomisation | | B. |
grinding/milling | | C. |
hammering | | D. |
electrolytic deposition |
Answer: Option C
Explanation:
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| 22. |
In the blast furnace, incorporation of water vapour in the blast gives the following effect. |
| A. |
Increases the reducing potential of the gas. | | B. |
Increases the flame temperature. | | C. |
No significant change occurs. | | D. |
Increases the hydrogen content in the metal. |
Answer: Option A
Explanation:
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| 23. |
Pick out the wrong statement. |
| A. |
A ferromagnetic material becomes paramagnetic above the 'Curie temperature'. | | B. |
Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials. | | C. |
Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces. | | D. |
Tungsten steel and alnico are not hard magnetic materials. |
Answer: Option D
Explanation:
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| 24. |
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel. |
| A. |
60 - 100 | | B. |
400 - 700 | | C. |
1200 -1500 | | D. |
2000 - 2300 |
Answer: Option B
Explanation:
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| 25. |
Maximum permissible air velocity in pipelines is about __________ metre/second. |
Answer: Option B
Explanation:
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