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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Electrical Transformers and Rotating Machines
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- What type of voltage is produced in all rotating armatures?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_forwardName three factors that determine the amount of induced voltage.arrow_forward
- Refer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forwardRefer to the transformer shown in Figure 5-13 to answer the following questions. What is the turns ratio of the winding between points B and E as compared to the winding between points D and E? Figure 5-13 Autotransformer practice problems.arrow_forwardWhat is the standard current rating for the secondary winding of a CT?arrow_forward
- What instrument is generally used to test an armature for a shorted winding?arrow_forwardThe speed of a moving coil motor (MCM) is varied by O changing the DC voltage applied to the armature O changing the width of DC pulses applied to the armaturearrow_forwardWhat are the two forcing frequencies?arrow_forward
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