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Question

Two 100 V full scale PMMC type DC voltmeters having sensitivity of 2kΩ/Vand 4kΩ/V are connected in series. The series combination can be used to measure a dc voltage of _________V.

A
100 V
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B
200 V
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C
150 V
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D
160 V
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Solution

The correct option is C 150 V
Meter - 1:

Vfsd=100 V

Sensitivity=2 kΩ/V

Rm1=200 kΩ

Ifsd 1=100200×105=0.5mA

Meter-2:

Vfsd=100 V

Sensitivity=4 kΩ/V

Rm1=400 kΩ

Ifsd 1=100400×103=0.25mA


I=min[Ifsd 1,Ifsd 2]

=0.25mA

V=I×600×103

=0.25×600×103×103=150 V

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