Discussion
The current coil in an electrodynamometer wattmeter is laminated in order to:
Answer: D
The current coil of an electrodynamometer wattmeter carries the load current, which alternates, and a solid conductor or core near it would carry eddy currents that cause loss and errors. The key gives the lamination as the way to reduce eddy current losses, option (D). Damping is provided by an air vane, creeping error is prevented by a compensating coil or a shading arrangement, and hysteresis loss is a feature of iron cores and is not what the lamination mainly reduces.
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