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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