Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 19, Problem 7RQ
To determine
The type of connection of the nine-lead three-phase motor when it is found that the continuity exist between T7, T8, and T9.
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A. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because-
1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field.3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil.
B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in-
1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.
(a) Describe/Illustrate in detail: Ways how to convert/transform the rotary motion (vertical or horizontal traverse) of the shaft of a motor to linear motion/displacement (prismatic).
(b) Represent mathematically the relation of the rotary motion of the shaft of the motor to linear.
In speed coontrol of dc motor, the potentiometer is used as a control element.
Select one:
True
False
Chapter 19 Solutions
Electrical Transformers and Rotating Machines
Ch. 19 - Why is it necessary to keep lubrication records...Ch. 19 - Why is it necessary to pick between the commutator...Ch. 19 - What are the effects of improper brush tension in...Ch. 19 - What instrument is used to test the insulation of...Ch. 19 - How do you check for an open armature winding?
Ch. 19 - What instrument is generally used to test an...Ch. 19 - Prob. 7RQCh. 19 - Prob. 8RQCh. 19 - Prob. 9RQCh. 19 - Assume that a nine-lead dual-voltage motor is...
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