Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 35, Problem 3SQ
To determine
Explain whether each speed push button is closed in succession when the motor is being accelerated, and state the reason.
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Assume the motor is running. What happens when the stop button is pressed and then the start button is pressed immediately?
For a start-stop push button control circuit that has been reconnected so that the start button is in parallel with both the stop button and holding contact, how do you jog and run the motor?
When calculating motors, why do we use the NEC table amperage instead of the nameplate amperage?
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Why do we connect stop pushbuttons in series in a two - station motor control?
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Describe how pressure switches are connected to start and stop (a) small motors and (b) large motors.
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How many poles are required on motor starters for the following motors:(a)240-volt, single-phase induction motor,(b)440-volt, three-phase induction motor?
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For what purpose was the asynchronous motor idle test performed? Please explain.
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What might be a hazard if a motor is started in the wrong direction?
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What happens if the reverse push button is closed when the motor is running in the forward direction as in Figure 485?
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