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Quiz

Lesson 3: Analog Measuring Instruments – Galvanometer, Ammeter, Voltmeter and Ohmmeter — Picture questions (exam style)

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1.
An ohmmeter has a 1.5 V cell and f.s.d. 0.5 mA. The pointer reaches 2/3 of full scale with Rx₁ and 4/5 with Rx₂. Which option is correct?
An ohmmeter has a 1.5 V cell and f.s.d. 0.5 mA. The pointer reaches 2/3 of full scale with Rx₁ and 4/5 with Rx₂. Which option is correct?
ohmmeter internal resistance = 3000 Ω, Rx₁ : Rx₂ = 2
ohmmeter internal resistance = 1500 Ω, Rx₁ : Rx₂ = 2
ohmmeter internal resistance = 1500 Ω, Rx₁ : Rx₂ = 1.2
ohmmeter internal resistance = 750 Ω, Rx₁ : Rx₂ = 0.5
2.
An ohmmeter has a 4.5 V cell and f.s.d. 2 mA. The pointer reaches 4/5 of full scale with Rx₁ and 1/5 with Rx₂. Which option is correct?
An ohmmeter has a 4.5 V cell and f.s.d. 2 mA. The pointer reaches 4/5 of full scale with Rx₁ and 1/5 with Rx₂. Which option is correct?
ohmmeter internal resistance = 2250 Ω, Rx₁ : Rx₂ = 0.0625
ohmmeter internal resistance = 9000 Ω, Rx₁ : Rx₂ = 0.0625
ohmmeter internal resistance = 9000 Ω, Rx₁ : Rx₂ = 0.25
ohmmeter internal resistance = 1125 Ω, Rx₁ : Rx₂ = 4
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