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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: 31
  • 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.
A generator has peak e.m.f. 188 V. Its rotation speed and its number of turns are both doubled. New r.m.s. e.m.f.?
A generator has peak e.m.f. 188 V. Its rotation speed and its number of turns are both doubled. New r.m.s. e.m.f.?
133 V
754 V
533 V
267 V
4.
An alternating e.m.f. of peak 20 V and frequency 50 Hz starts from zero at t = 0. Complete the table: what is e at t = 4 ms?
An alternating e.m.f. of peak 20 V and frequency 50 Hz starts from zero at t = 0. Complete the table: what is e at t = 4 ms?
3.97 V
19.0 V
6.18 V
13.4 V
5.
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
6.
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
7.
A generator coil (100 turns, 300 cm2) turns at 1200 rev/min in a 0.5 T field as shown. Find the peak e.m.f.
A generator coil (100 turns, 300 cm²) turns at 1200 rev/min in a 0.5 T field as shown. Find the peak e.m.f.
11300 V
1800 V
188 V
133 V
8.
The graph shows a half-wave rectified voltage. What is the mean value of this voltage over a cycle?
The graph shows a half-wave rectified voltage. What is the mean value of this voltage over a cycle?
5.00 V
1.59 V
3.54 V
2.50 V
9.
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
10.
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
11.
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
12.
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
13.
The graph shows an alternating voltage. What is the r.m.s. value of this voltage?
The graph shows an alternating voltage. What is the r.m.s. value of this voltage?
70.0 V
156 V
140 V
220 V
14.
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
15.
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
16.
A generator coil (300 turns, 50.0 cm2) turns at 3600 rev/min in a 0.2 T field as shown. Find the peak e.m.f.
A generator coil (300 turns, 50.0 cm²) turns at 3600 rev/min in a 0.2 T field as shown. Find the peak e.m.f.
6790 V
80.0 V
113 V
1080 V
17.
The graph shows a full-wave rectified voltage. What is the r.m.s. value of this voltage?
The graph shows a full-wave rectified voltage. What is the r.m.s. value of this voltage?
6.37 V
7.07 V
10.0 V
3.18 V
18.
An alternating e.m.f. of peak 20 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 1 ms?
An alternating e.m.f. of peak 20 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 1 ms?
2.00 V
16.2 V
11.8 V
8.31 V
19.
An alternating e.m.f. of peak 300 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 2.5 ms?
An alternating e.m.f. of peak 300 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 2.5 ms?
300 V
1.84×10−14 V
212 V
74.2 V
20.
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
21.
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
22.
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
23.
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
24.
The graph shows a full-wave rectified voltage. What is the mean value of this voltage over a cycle?
The graph shows a full-wave rectified voltage. What is the mean value of this voltage over a cycle?
25.0 V
35.4 V
31.8 V
50.0 V
25.
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
26.
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
27.
The graph shows a half-wave rectified voltage. What is the r.m.s. value of this voltage?
The graph shows a half-wave rectified voltage. What is the r.m.s. value of this voltage?
31.8 V
25.0 V
15.9 V
50.0 V
28.
An alternating e.m.f. of peak 200 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 7.5 ms?
An alternating e.m.f. of peak 200 V and frequency 100 Hz starts from zero at t = 0. Complete the table: what is e at t = 7.5 ms?
-3.67×10−14 V
-141 V
136 V
-200 V
29.
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
30.
The graph shows a half-wave rectified voltage. What is the mean value of this voltage over a cycle?
The graph shows a half-wave rectified voltage. What is the mean value of this voltage over a cycle?
220 V
70.0 V
110 V
156 V
31.
A generator coil (200 turns, 50.0 cm2) turns at 600 rev/min in a 0.5 T field as shown. Find the peak e.m.f.
A generator coil (200 turns, 50.0 cm²) turns at 600 rev/min in a 0.5 T field as shown. Find the peak e.m.f.
1880 V
31.4 V
300 V
22.2 V
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