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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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
Answer all part of the questions.
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
- What is the standard current rating for the secondary winding of a CT?arrow_forwardThe supply frequency is 50 Hz. What will be the rotor voltage frequency if the motor speed is equal to 90% of synchronous speed. O 45 Hz. O 10 Hz. 05 Hz. O None.arrow_forwardIf the load in question 7 was supplied by two autotransformers connected in open delta, what would be the minimum standard size transformers that could be used to supply this load?arrow_forward
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