Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 14, Problem 4RQ
What type of armature winding would be used for a machine intended for high-voltage, low-current operation?
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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?
Problem 5
1.
Where and why is a centrifugal switch used in a split-phase motor?
2.
Why and where is a capacitor used in the single-phase AC motor?
3. What type of motor would you select to perform each of the following jobs?
(a) Electric drill:
(b) Refrigerator:
(c) Hair driers and desk fans:
(d) Air Conditioner Fan:
(e) XY plotters and printers:
(f) Electric clock:
2) In an DC machine, ______________________________ provides the mechanical support to the whole machine.
Select one :
Yoke
Brushes
Pole shoe
Interpoles
Chapter 14 Solutions
Electrical Transformers and Rotating Machines
Ch. 14 - Prob. 1RQCh. 14 - What type of voltage is produced in all rotating...Ch. 14 - What are the three types of armature windings?Ch. 14 - What type of armature winding would be used for a...Ch. 14 - What are interpoles, and what is their purpose?Ch. 14 - How are interpoles connected in relation to the...Ch. 14 - What type of field winding is made with many turns...Ch. 14 - How is the series field connected in relation to...Ch. 14 - How is the shunt field connected in relation to...Ch. 14 - What is armature reaction?
Ch. 14 - To what is armature reaction proportional?Ch. 14 - What are eddy currents?Ch. 14 - What condition characterizes overcompounding?Ch. 14 - Prob. 14RQCh. 14 - Prob. 15RQCh. 14 - Explain the difference between cumulative- and...Ch. 14 - What three factors determine the amount of output...Ch. 14 - To what is the voltage regulation of a DC...Ch. 14 - To what is countertorque proportional?Ch. 14 - Of what is countertorque a measure?
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- When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardWhat solid-state device is generally used to produce variable frequency in drives designed to control motors up to 500 HP?arrow_forwardIf the load in question 7 is connected in a wye, what would be the line voltage and line current supplying the load?arrow_forward
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