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| Q. |
Which of these materials is not used for resistance coils? |
| A. | nickel |
| B. | copper |
| C. | titanium |
| D. | platinum |
| Answer» C. titanium | |
| Explanation: resistance coils are generally made of nickel, copper, or platinum. nickel and copper can be used in the temperature range of 150-500 f, whereas platinum can be used between -350 to 1100 f. | |
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