Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 2, Problem 8RQ
To determine
The component that controls the two CR contacts in the circuit shown in Figure 2-33.
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Chapter 2 Solutions
Understanding Motor Controls
Ch. 2 - Prob. 1RQCh. 2 - The symbol shown is:
Normally closed float...Ch. 2 - The symbol shown is: a. Iron core transformer b....Ch. 2 - The symbol shown is:
Normally open pressure...Ch. 2 - The symbol shown is: a. Double acting push button...Ch. 2 - If you were installing the circuit in Figure 233,...Ch. 2 - Referring to the circuit in Figure 2–33, should...Ch. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - When reading a schematic diagram, are the control...
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- Refer to the circuit shown in Figure 5-29. In this circuit, the HR contactor is equipped with five contacts. Three are load contacts and two are auxiliary contacts. From looking at the schematic diagram, how is it possible to identify which contacts are the load contacts and which are the auxiliary contacts? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardFollowing the procedure discussed in Chapter 7, place wire numbers on the schematic in Figure 8–7. Place corresponding wire numbers on the components shown in Figure 8–8.arrow_forwardThe secondary of the transformer in question #3 has a rated voltage of 2400 volts. What size fuse should be used to provide branch circuit protection?arrow_forward
- Refer to the transformer shown in Figure 5-13 to answer the following questions. The transformer shown in Figure 5-13 is supplying 325 volt amperes to a load. The primary voltage is 240 volts. What is the primary current? Figure 5-13 Autotransformer practice problems.arrow_forwardRefer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate? Figure 7-10 Numbers are placed beside all components.arrow_forwardRefer to the circuit in Figure 20–23. Assume that the door is being raised and something breaks the light beam. Will this cause the door to stop moving?arrow_forward
- Refer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.arrow_forwardWhile discussing the circuit shown in Figure 15-66: Technician A says that the total resistance of the circuit is 1 ohm. Technician B says that the current flow through the 6-ohms of resistance is 12 amps. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardName three factors that determine the amount of induced voltage.arrow_forward
- Refer to Figure 21–1 to answer the following questions. When switch HOA SW 122 is in the off position, which contacts have connection between them?arrow_forwardRefer to the circuit shown in Figure 5-29. Is the thermostat contact normally open, normally closed, normally closed held open, or normally open held closed? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardPower-consuming devices are wired in _____(series orparallel).arrow_forward
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