Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 19
| 16. |
Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay. |
| A. |
atoms | | B. |
neutrons | | C. |
nucleons | | D. |
electrons |
Answer: Option A
Explanation:
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| 17. |
The product of a commercial direct reduction process is |
| A. |
liquid iron | | B. |
solid iron | | C. |
sponge iron | | D. |
iron saturated with carbon |
Answer: Option C
Explanation:
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| 18. |
In the diving apparatus, helium is used along with oxygen, because it is |
| A. |
easily available. | | B. |
not soluble in blood at high pressure. | | C. |
lighter than nitrogen. | | D. |
completely miscible with oxygen. |
Answer: Option B
Explanation:
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| 19. |
Materials having resistivity ranging from 1 to 100 ohm. cm is termed as |
| A. |
conductor | | B. |
insulator | | C. |
semi-conductor | | D. |
none of these |
Answer: Option C
Explanation:
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| 20. |
During sensible cooling of air, its wet bulb temperature |
| A. |
decreases but dew point remains constant. | | B. |
increases but dew point remains constant. | | C. |
increases & the dew point decreases. | | D. |
decreases & the dew point increases. |
Answer: Option B
Explanation:
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