Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 21, Problem 8SQ

What is the sequence of the operations if the limit switches, shown in Figure 21–6, are used. (Limit switches were covered in Unit 13.)

Chapter 21, Problem 8SQ, What is the sequence of the operations if the limit switches, shown in Figure 216, are used. (Limit

Fig. 21–6 Elementary diagram of the reversing starter shown in Figure 21–1. The mechanical, push-button, and auxiliary contact interlocks are indicated.

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Q.11 A normally open auxiliary contact connected in parallel to maintain a circuit to the relay coil when the push button is released is part of what type of control circuit? Select one: A. START-STOP PUSH BUTTON B. JOGGING SWITCH C. STARTING SWITCH D. EMERGENCY STOP BUTTON
7. Which statement is true for the process-control relay ladder diagram shown in the figure? A. The pressure switch, temperature switch, and push button must be closed for the motor to start. B. With the temperature switch closed, the motor will start once the push button is pressed. C. With the pressure switch closed and the push button released, the motor will start. D. Only the temperature switch has to close for the motor to start.
2. In the motor control circuit of Figure 11 in your study unit, the operation of any one of the overload relays has which of the following effects?A. The motor only runs two phases.B. The motor operates normally. C. The auxiliary contact M closes. D. The motor stops
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