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Question

Two 100 V full scale PMMC type dc voltmeter having figure of merits (FOM) of 10kΩ/V and 20kΩ/V are connected in series. The series combination can be used to measure a maximum DC voltage of ____V.
  1. 150

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Solution

The correct option is A 150
(Ifsd)1=110kΩ/V=0.1mA
(Ifsd)2=120kΩ/V=0.05mA
In series application, maximum current will be 0.05 mA.

Resistance of M1=10kΩ/V×100V=1MΩ

Resistance of M2=20kΩ/V×100V=2MΩ

Hence, the maximum voltage rating

=Imax.(RM1+RM2)

=0.05mA×(1+2)MΩ=150V

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