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The moving coil in a PMMC (Permanent Magnet Moving Coil) instrument is wound on an aluminum frame to provide:

AFluid friction damping
BHysteresis damping
CAir friction damping
DEddy current damping

Explanation

As aluminum frame rotates in the magnetic field, induced eddy currents create a opposing electromagnetic torque, giving effective damping.

Submitted by: mcqstutor Team More Electrical Engineering MCQs →

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