EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 50, Problem 6SQ
To determine
Explain the necessity to reverse the polarity of the series field of a compound motor if it is used in the dynamic braking circuit.
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1. With fixed number of quantization levels in PCM, the quantization noise is
(linearly
proportional to signal amplitude, non-linearly proportional to signal amplitude, linearly proportional to
signal frequency, non-linearly proportional to signal frequency).
2. A PCM encoder uses 130 quantization levels. Which of the following N bits is more economical to
encode such signal? (N=6, N=7, N=9, N=10).
3. Frequency Shift Keying can be accomplished by
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(adding two On-Off Keying signals,
Frequency Shift Keying signals).
4. Which of the following statements is true with respect to PCM? (The parallel binary data is converted
into serial before transmission, Analog data is transmitted directly, Analog signal is amplified before
transmission, The analog signal is converted into parallel binary data before transmission).
5. A baseband speech signal of maximum frequency of…
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EBK ELECTRIC MOTOR CONTROL
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