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The RMS value of high frequency AC signal applied to a PMMC instrument is 120V. then reading of PMMC instrument will be –
  • a)
    120 V
  • b)
    169.07 V
  • c)
    0
  • d)
    60 V
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The RMS value of high frequency AC signal applied to a PMMC instrument...
The permanent magnet moving coil instrument or PMMC type instrument uses two permanent magnets in order to create stationary magnetic field. These types of instruments are only used for measuring the DC quantities as if we apply AC current to these type of instruments the direction of current will be reversed during negative half cycle and hence the direction of torque will also be reversed which gives average value of torque zero.
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Most Upvoted Answer
The RMS value of high frequency AC signal applied to a PMMC instrument...
The reading of a PMMC instrument will be the same as the RMS value of the high frequency AC signal, which is 120V.
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The RMS value of high frequency AC signal applied to a PMMC instrument is 120V. then reading of PMMC instrument will be –a)120 Vb)169.07 Vc)0d)60 VCorrect answer is option 'C'. Can you explain this answer?
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