DC Machines Flashcards
How is power supplied to the armature?
Provided by the commutator
How is the commutator is supplied with current?
Via brushes
What is the armature?
Rotates inside the magnetic field produced by the field coils
A series wound DC generator while charging, what is the condition of the voltage regulation?
Very poor voltage regulation while under charging load
What happens to voltage when electrical load is increased in a series wound DC generator?
Voltage increases
How does an increase in load affect the output voltage of a shunt DC generator?
Causes a decrease in the output voltage
What happens to the field current and voltage if the resistance of the field circuit is increased in a shunt DC generator?
Current and voltage is reduced
How does the output vary with load on a compound DC generator?
Remains relatively constant
How does an increase in current change the magnetism of the field and armature in a series DC motor?
Strengthens the magnetic field and armature
What motor is able to draw a large current for starting?
Series DC motor
What type of motor will run at high speeds when it has a light load?
Series DC motor
What type of motor has a high resistance field winding?
Shunt DC motor
How does field current vary with motor speed of a shunt DC motor?
It does not vary
