Question

Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?

(a) 10 kΩ/V and 10 kΩ/V

(b) 100 kΩ/V and 10 kΩ/V

(c) 10 kΩ/V and 100 kΩ/V

(d) 10 kΩ/V and 1 kΩ/V

The question was posed to me in an online quiz.

Asked question is from Advanced Problems on Indicating Instruments topic in division Extension of Instrument Ranges of Electrical Measurements

Answer 1

The correct answer is (a) 10 kΩ/V and 10 kΩ/V

Explanation: SV = \(\frac{1}{I_{SS}}\) = current required for full scale deflection

SV = \( \frac{1}{100 × 10^{-6}}\) = 10 kΩ/V.