Engineering :: Engineering Materials
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| 261. |
Which of the following is the lightest? |
| A. |
Molecule |
B. |
Atom |
| C. |
Neutron |
D. |
Electron |
| E. |
Proton |
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Answer: Option D
Explanation:
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| 262. |
In plain carbon steel as the percentage of carbon increases from 0.2% to 0.8% which of the following decreases? |
| A. |
Brinell hardness number |
B. |
Tensile strength |
| C. |
Percentage elongation |
D. |
All of the above |
| E. |
None of the above |
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Answer: Option C
Explanation:
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| 263. |
Machining properties of brass can be improved by the addition of |
| A. |
Aluminium Copper alloy |
B. |
Lead |
| C. |
Carbon |
D. |
Zinc |
| E. |
Chromium |
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Answer: Option B
Explanation:
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| 264. |
Which of the following is not the characteristic property of aluminium? |
| A. |
Lightness |
B. |
Good electrical conductivity |
| C. |
High thermal conductivity |
D. |
Resistance to corrosion |
| E. |
Lest affinity for oxygen |
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Answer: Option E
Explanation:
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| 265. |
Galena is the ore for |
| A. |
Aluminium |
B. |
Copper |
| C. |
Zinc |
D. |
Lead |
| E. |
Germanium |
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Answer: Option D
Explanation:
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| 266. |
For heavy loads in aircraft bearings the material used with lead to reduce the risk of scizure is |
Answer: Option B
Explanation:
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| 267. |
Compressve strength of wood is usually |
| A. |
More along the grains |
B. |
More across the grains |
| C. |
Equal in all directions |
D. |
Maximum at 45? to the direction of grains |
Answer: Option A
Explanation:
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| 268. |
Which is expected to be strongest in tension? |
| A. |
Piano wire |
B. |
Mild steel wire |
| C. |
Aluminium wire |
D. |
Stainless steel wire |
| E. |
Brass wire |
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Answer: Option A
Explanation:
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| 269. |
DIN standards are used in |
Answer: Option B
Explanation:
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| 270. |
Standards used in USSR are known as |
Answer: Option A
Explanation:
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