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Physics

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: 8
  • Passing grade: 60%
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1.
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
2.
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
3.
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
4.
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
5.
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
6.
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
7.
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
8.
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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