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| Q. |
In eddy current heating of steel, if the depth of heating is to be increased |
| A. | Voltage should be high |
| B. | Some resisting material must be applied on the surface of article to be heated |
| C. | Frequency must be low |
| D. | Time of heating should be high |
| E. | Frequency must be high |
| Answer» C. Frequency must be low | |
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