Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 15, Problem 15RQ
To determine
The device which is used to disconnect power to armature if the shunt field current drops below the certain level.
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What happens when the low-voltage current flow inthe coil primary winding is interrupted by the switchingdevice?a. The magnetic field collapses.b. A high-voltage is induced in the coil secondarywinding.c. Both a and b.d. Neither a nor b
1. What will be the output voltage during the positive half cycle of the input voltage?
2. What will be the output voltage during the negative half cycle of the input voltage?
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Electrical Transformers and Rotating Machines
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- How are interpoles connected in relation to the armature?arrow_forwardA CT has a current flow of 80 amperes in its primary winding and a current of 2 amperes in its secondary winding. What is the ratio of the CT?arrow_forwardHow is the series field connected in relation to the armature?arrow_forward
- Why should the secondary winding of a CT never be disconnected from its load when there is current flow in the primary?arrow_forwardWhat is the standard current rating for the secondary winding of a CT?arrow_forwardThe short-circuit protective device supplying the motors in question #10 is an inverse-time circuit breaker. What size circuit breaker should be used?arrow_forward
- How can the polarity of an electromagnet be determined if the direction of current flow is known?arrow_forwardWhat type of armature winding is generally used for machines designed to operate on low voltage and high current?arrow_forwardAn AC power source is connected across 325 turns of an autotransformer, and the load is connected across 260 turns. What is the turns ratio of this transformer?arrow_forward
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