Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 16
| 31. |
Heat treatment of steel is done to mainly change its __________ properties. |
| A. |
physical | | B. |
chemical | | C. |
mechanical | | D. |
surface |
Answer: Option C
Explanation:
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| 32. |
Normal dosage of chlorine in public water supply scheme ranges from __________ ppm. |
| A. |
0.5 to 1 | | B. |
10 to 15 | | C. |
300 to 500 | | D. |
1000 to 1500 |
Answer: Option A
Explanation:
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| 33. |
Cast iron has the unique property of high |
| A. |
ductility | | B. |
damping characteristics | | C. |
hardness | | D. |
malleability |
Answer: Option B
Explanation:
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| 34. |
Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that |
| A. |
cooling produces tension on the surface. | | B. |
cooling produces compression on the surface. | | C. |
heating does not produces any thermal stress. | | D. |
heating produces compression on the surface. |
Answer: Option A
Explanation:
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| 35. |
The hardness of a grinding wheel is specified by the |
| A. |
alphabetical letter. | | B. |
Rockwell hardness number. | | C. |
Brinell hardness number. | | D. |
none of these. |
Answer: Option A
Explanation:
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