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Q. |
What material is used to make electric heater coil? |
A. | Copper |
B. | Iron |
C. | Silver |
D. | Nichrome |
Answer» D. Nichrome | |
Explanation: Nichrome is a non-magnetic alloy of nickel, chromium, and often iron, usually used as a resistance wire. Patented in 1905, it is the oldest documented form of resistance heating alloy. A common alloy is 80% nickel and 20% chromium, by mass, but there are many others to accommodate various applications. It is silvery-grey in colour, is corrosion-resistant, and has a high melting point of about 1400 degree C (2552 degree F). |
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