SSC JE Electrical Engineering 22 Jan 2018 Morning Paper

Question : 146 of 200

Marks: +1, -0

What will be the sensitivity (in Ohms/volts) of a PMMC type voltmeter when the full-scale reading of the voltmeter is 240 V, the internal resistance of the voltmeter is 200 kilo-Ohms and the series resistance connected to the voltmeter is 80 kilo-Ohms?

1672.62
1432.23
1224.24
1166.67

Validate

Solution:

V = 240 V
r = 200 kΩ

\r_\s

= 80 kΩ
Now sensitivity

= \Resistance/\Voltage

={200×10^3+80×10^3}/240

= 1166.67 Ω/V

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