Electrical Engineering · Electrical Instruments
The scale of a Permanent Magnet Moving Coil (PMMC) instrument is uniform because of:
- 1the total absence of hysteresis loss
- 2the use of spring control providing a linear deflecting torque relationship✓
- 3the use of a shielding type external case
- 4effective eddy current damping
Correct answer
the use of spring control providing a linear deflecting torque relationship
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