Question
Download Solution PDFMore power is required to operate a moving-iron meter than a PMMC meter because of the magnetic circuit's high _____.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFMoving iron meter has large magnetic reluctance as compared to PMMC meter. That’s why more power is required to operate the moving iron meter.
Advantages of moving iron:
- It is a universal instrument which can be used for the measurement of AC and DC quantities
- These instruments can withstand large loads and are not damaged even under severe overload conditions
- It is very cheap due to the simple construction
Disadvantages of moving iron:
- These instruments suffer from error due to hysteresis, frequency change and stray losses
- The reading of the instrument is affected by temperature variation
Note: In terms of accuracy PMMC meter has the highest accuracy. The order of accuracy is given below.
Induction < Moving iron < PMMC instruments
Last updated on May 29, 2025
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