Refer to the accompanying figure. Basic electrical theory of a DC motor-generator, variable speed control system. Briefly explain how speeds above the motor base speed (nameplate speed) and speeds below the motor base speed are obtained.
What will be an ideal response?
Speeds above the motor base speed (nameplate speed) are obtained by weakening the motor shunt field. Speeds below the motor base speed are obtained by weakening the generator field.
You might also like to view...
Hybridization is generally a better technique than mass selection for cross-pollinated species
Indicate whether the statement is true or false
Many intake system air ducts use a resonator to reduce noise generated within the ducts.
Answer the following statement true (T) or false (F)
Where multiple power supplies serve the same dc system, the dc side of each power supply shall have a ____.
A. disconnecting means B. suitable ground C. removable conductor D. removable fuses
When testing an alternator rotor, if an ohmmeter shows zero ohms with one meter lead attached to the slip rings and the other meter lead touching the rotor shaft, the rotor is ________
A) Defective (shorted-to-ground) B) Defective (rotor windings are open) C) Defective (shorted-to-copper) D) Operating normally