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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 2: Combined RLC Circuits, Impedance and Electrical Resonance — Picture questions (exam style)

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  • Questions count: 11
  • Passing grade: 60%
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1.
Series RLC (R = 40 Ω, X_L = 120 Ω, X_C = 120 Ω) on 100 V rms. Which option is correct?
Series RLC (R = 40 Ω, X_L = 120 Ω, X_C = 120 Ω) on 100 V rms. Which option is correct?
Z = 40 Ω, resistive (resonance), true power = 250 W
Z = 40 Ω, capacitive (I leads V), true power = 250 W
Z = 174 Ω, resistive (resonance), true power = 250 W
Z = 280 Ω, resistive (resonance), true power = 250 W
2.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 4. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 4. Which option is correct?
resonant frequency × 2, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance increases
resonant frequency × 1, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance decreases
3.
What capacitance with a 0.2 H inductor gives resonance at 1000 Hz? (see resonance curve)
What capacitance with a 0.2 H inductor gives resonance at 1000 Hz? (see resonance curve)
796 μF
0.127 μF
5.00 μF
0.253 μF
4.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 9. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 9. Which option is correct?
resonant frequency × 3/2, maximum current at resonance unchanged
resonant frequency × 4/3, maximum current at resonance unchanged
resonant frequency × 2/3, maximum current at resonance increases
resonant frequency × 2/3, maximum current at resonance unchanged
5.
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 2. Which option is correct?
resonant frequency × 2/9, maximum current at resonance unchanged
resonant frequency × 5/11, maximum current at resonance unchanged
resonant frequency × 2/9, maximum current at resonance increases
resonant frequency × 17/4, maximum current at resonance increases
6.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 0.25. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 0.25. Which option is correct?
resonant frequency × 1/4, maximum current at resonance decreases
resonant frequency × 4, maximum current at resonance decreases
resonant frequency × 4, maximum current at resonance unchanged
resonant frequency × 1/4, maximum current at resonance unchanged
7.
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 2. Which option is correct?
resonant frequency × 1/4, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance decreases
resonant frequency × 1/2, maximum current at resonance unchanged
resonant frequency × 1, maximum current at resonance unchanged
8.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 2. Which option is correct?
resonant frequency × 17/12, maximum current at resonance decreases
resonant frequency × 17/12, maximum current at resonance unchanged
resonant frequency × 17/12, maximum current at resonance increases
resonant frequency × 17/6, maximum current at resonance decreases
9.
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 4. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 4. Which option is correct?
resonant frequency × 17/6, maximum current at resonance increases
resonant frequency × 4/11, maximum current at resonance increases
resonant frequency × 4/11, maximum current at resonance unchanged
resonant frequency × 17/6, maximum current at resonance decreases
10.
In an RLC resonant circuit (fixed R and V) L is multiplied by 1 and C by 0.25. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 1 and C by 0.25. Which option is correct?
resonant frequency × 2, maximum current at resonance unchanged
resonant frequency × 4, maximum current at resonance decreases
resonant frequency × 1/2, maximum current at resonance decreases
resonant frequency × 2, maximum current at resonance decreases
11.
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 9. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 9. Which option is correct?
resonant frequency × 2/9, maximum current at resonance decreases
resonant frequency × 1/9, maximum current at resonance unchanged
resonant frequency × 1/9, maximum current at resonance decreases
resonant frequency × 0, maximum current at resonance decreases
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