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Electrical and electronics measurements miscellaneous

Electrical and Electronics Measurements

  1. A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type ac voltmeter connected in parallel. If the meter readings are V1 and V2 respectively and the meters are free from calibration errors, then the form factor of the ac voltage may be estimated as
    1. V1
      V2
    2. 1.11V1
      V2
    3. 2V1
      V2
    4. πV1
      V2
Correct Option: B

Form factor of the wave =
rms Value
Mean Value

Moving iron Instrument will show rms value. Rectifier voltmeter is calibrate to read rms value of sinusoidal voltage, i.e. with form factor of 1.11.
∴ Mean value of the applied voltage =
V2
1.11

∴ Form factor =
V1
=
1011V1
V2/1.11V2



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