Physics · Electrical Measurements
Which of the following statements are correct about the errors in Permanent Magnet Moving Coil (PMMC) instruments? I. The swamping resistance is included in series with the moving coil to reduce temperature errors. II. The swamping resistance is included in parallel with the moving coil to reduce errors. III. Errors are caused by weakening of the permanent magnet due to aging. IV. Errors are caused by weakening of the spring due to aging and temperature.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only I and III
- 2Only III and IV
- 3Only I, III and IV✓
- 4Only II, III and IV
Correct answer
Only I, III and IV
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