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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: The Alternating Current Generator (AC Dynamo) and Rectification — Picture questions (exam style)

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  • Questions count: 17
  • Passing grade: 60%
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1.
A generator has peak e.m.f. 300 V. Its coil turns through 45° from the position with its plane parallel to the field. Which option is correct?
A generator has peak e.m.f. 300 V. Its coil turns through 45° from the position with its plane parallel to the field. Which option is correct?
e = 300 V, rms = 300 V
e = 212.1 V, rms = 150 V
e = 212.1 V, rms = 212.1 V
e = 212.1 V, rms = 191 V
2.
In an a.c. generator the turns ×2, rotation speed ×3, flux density ×0.5. Which option is correct?
In an a.c. generator the turns ×2, rotation speed ×3, flux density ×0.5. Which option is correct?
peak emf × 6, frequency × 3
peak emf × 3, frequency × 3
peak emf × 1, frequency × 3
peak emf × 1, frequency × 6
3.
The graph shows a half-wave rectified voltage. What is the frequency of the original a.c. supply?
The graph shows a half-wave rectified voltage. What is the frequency of the original a.c. supply?
0.0100 Hz
100 Hz
10.0 Hz
20.0 Hz
4.
A generator has peak e.m.f. 200 V. Its coil turns through 60° from the position with its plane perpendicular to the field. Which option is correct?
A generator has peak e.m.f. 200 V. Its coil turns through 60° from the position with its plane perpendicular to the field. Which option is correct?
e = 173.2 V, rms = 200 V
e = 141.4 V, rms = 100 V
e = 200 V, rms = 100 V
e = 173.2 V, rms = 141.4 V
5.
A generator has peak e.m.f. 100 V. Its coil turns through 120° from the position with its plane parallel to the field. Which option is correct?
A generator has peak e.m.f. 100 V. Its coil turns through 120° from the position with its plane parallel to the field. Which option is correct?
e = 86.6 V, rms = 70.71 V
e = 50 V, rms = 70.71 V
e = 100 V, rms = 63.66 V
e = 100 V, rms = 70.71 V
6.
In an a.c. generator the turns ×2, rotation speed ×2, flux density ×2. Which option is correct?
In an a.c. generator the turns ×2, rotation speed ×2, flux density ×2. Which option is correct?
peak emf × 8, frequency × 8
peak emf × 4, frequency × 2
peak emf × 8, frequency × 2
peak emf × 16, frequency × 1
7.
A generator has peak e.m.f. 300 V. Its coil turns through 120° from the position with its plane perpendicular to the field. Which option is correct?
A generator has peak e.m.f. 300 V. Its coil turns through 120° from the position with its plane perpendicular to the field. Which option is correct?
e = 212.1 V, rms = 191 V
e = 300 V, rms = 191 V
e = 300 V, rms = 300 V
e = 259.8 V, rms = 212.1 V
8.
In an a.c. generator the turns ×2, rotation speed ×1, flux density ×2. Which option is correct?
In an a.c. generator the turns ×2, rotation speed ×1, flux density ×2. Which option is correct?
peak emf × 4, frequency × 4
peak emf × 4, frequency × 1
peak emf × 1, frequency × 1
peak emf × 1, frequency × 4
9.
A generator has peak e.m.f. 300 V. Its coil turns through 60° from the position with its plane parallel to the field. Which option is correct?
A generator has peak e.m.f. 300 V. Its coil turns through 60° from the position with its plane parallel to the field. Which option is correct?
e = 212.1 V, rms = 150 V
e = 150 V, rms = 212.1 V
e = 300 V, rms = 150 V
e = 259.8 V, rms = 150 V
10.
In an a.c. generator the turns ×1, rotation speed ×2, flux density ×1. Which option is correct?
In an a.c. generator the turns ×1, rotation speed ×2, flux density ×1. Which option is correct?
peak emf × 2, frequency × 2
peak emf × 4, frequency × 2
peak emf × 1, frequency × 4
peak emf × 4, frequency × 4
11.
In an a.c. generator the turns ×0.5, rotation speed ×2, flux density ×0.5. Which option is correct?
In an a.c. generator the turns ×0.5, rotation speed ×2, flux density ×0.5. Which option is correct?
peak emf × 0.25, frequency × 2
peak emf × 2, frequency × 0.5
peak emf × 0.5, frequency × 2
peak emf × 1, frequency × 1
12.
A generator has peak e.m.f. 50 V. Its coil turns through 90° from the position with its plane parallel to the field. Which option is correct?
A generator has peak e.m.f. 50 V. Its coil turns through 90° from the position with its plane parallel to the field. Which option is correct?
e = 35.36 V, rms = 35.36 V
e = 3.062e-15 V, rms = 35.36 V
e = 3.062e-15 V, rms = 31.83 V
e = 35.36 V, rms = 31.83 V
13.
In an a.c. generator the turns ×2, rotation speed ×1, flux density ×1. Which option is correct?
In an a.c. generator the turns ×2, rotation speed ×1, flux density ×1. Which option is correct?
peak emf × 2, frequency × 1
peak emf × 2, frequency × 2
peak emf × 1, frequency × 2
peak emf × 4, frequency × 1
14.
In an a.c. generator the turns ×0.5, rotation speed ×3, flux density ×0.5. Which option is correct?
In an a.c. generator the turns ×0.5, rotation speed ×3, flux density ×0.5. Which option is correct?
peak emf × 0.75, frequency × 1
peak emf × 0.75, frequency × 0.75
peak emf × 3, frequency × 6
peak emf × 0.75, frequency × 3
15.
In an a.c. generator the turns ×1, rotation speed ×3, flux density ×0.5. Which option is correct?
In an a.c. generator the turns ×1, rotation speed ×3, flux density ×0.5. Which option is correct?
peak emf × 1.5, frequency × 6
peak emf × 1.5, frequency × 3
peak emf × 3, frequency × 1.5
peak emf × 0.5, frequency × 1
16.
A generator has peak e.m.f. 300 V. Its coil turns through 30° from the position with its plane perpendicular to the field. Which option is correct?
A generator has peak e.m.f. 300 V. Its coil turns through 30° from the position with its plane perpendicular to the field. Which option is correct?
e = 259.8 V, rms = 150 V
e = 259.8 V, rms = 191 V
e = 150 V, rms = 212.1 V
e = 212.1 V, rms = 300 V
17.
A generator has peak e.m.f. 300 V. Its coil turns through 45° from the position with its plane perpendicular to the field. Which option is correct?
A generator has peak e.m.f. 300 V. Its coil turns through 45° from the position with its plane perpendicular to the field. Which option is correct?
e = 212.1 V, rms = 150 V
e = 212.1 V, rms = 212.1 V
e = 300 V, rms = 150 V
e = 212.1 V, rms = 300 V
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