Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 31, Problem 4SQ
To determine
Explain why four motor contacts are there for high speeds and low speeds in Figure 31-4.
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A) Calculate the efficiency of the test transformer at the resistive
loads (X-25%, 50%, 75%, 100%, 125% full load).
B) From part (A) draw the plot (efficiency Vs power output) of the
transformer.
C) Discuss the plot of part (B).
a- Determine fH; and Ho
b- Find fg and fr.
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determine the cutoff frequency.
Ans: 277.89 KHz; 2.73 MHz; 895.56 KHz; 107.47 MHz.
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Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
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