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Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

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

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  • Questions count: 6
  • Passing grade: 60%
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1.
A galvanometer (Rg = 50 Ω, Ig = 2 mA) is converted once into a 1 A ammeter and once into a 20 V voltmeter. Which option is correct?
A galvanometer (Rg = 50 Ω, Ig = 2 mA) is converted once into a 1 A ammeter and once into a 20 V voltmeter. Which option is correct?
Rs = 250 Ω, Rm = 400 Ω, resulting ammeter resistance ≈ 50.1 Ω
Rs = 1 Ω, Rm = 1e+04 Ω, resulting ammeter resistance ≈ 50.1 Ω
Rs = 0.1 Ω, Rm = 1e+04 Ω, resulting ammeter resistance ≈ 50 Ω
Rs = 0.1 Ω, Rm = 9950 Ω, resulting ammeter resistance ≈ 0.1 Ω
2.
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
3.
Which statement about the instruments shown is NOT correct?
Which statement about the instruments shown is NOT correct?
the multiplier is in series and has large resistance
a smaller shunt gives a larger ammeter range
the shunt is in parallel with the coil and has small resistance
the ohmmeter zero is at zero deflection
4.
A dual-range voltmeter: galvanometer (Rg = 100 Ω, Ig = 2.00 mA) with R₁ and R₂ in series; the terminals give ranges 3 V and 15 V. Find R₂.
A dual-range voltmeter: galvanometer (Rg = 100 Ω, Ig = 2.00 mA) with R₁ and R₂ in series; the terminals give ranges 3 V and 15 V. Find R₂.
7400 Ω
1400 Ω
7500 Ω
6000 Ω
5.
Two equal 2.00 kΩ resistors are in series with a 12 V supply. A voltmeter of resistance 10.0 kΩ is connected across one. What does it read?
Two equal 2.00 kΩ resistors are in series with a 12 V supply. A voltmeter of resistance 10.0 kΩ is connected across one. What does it read?
6.55 V
6.00 V
10.0 V
5.45 V
6.
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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