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Theory questions for_dc_machines
1. Theory Questions for DC machines
1. Discuss three factors affecting the induced voltage in DC generators.
Propose one method to increase the induced Voltage.
2. Briefly, discuss the type (and source) of the losses in DC machines
3. Briefly, discuss the DC machines construction.
4. What is armature reaction? How does it affect the operation of a dc
machine?
5. How can the speed of a shunt dc motor be controlled? Explain one method
in details.
6. Why do we need a starting method for DC motors ? Explain one starting
method for DC motors.
7. What happens in a shunt dc motor if its field circuit opens while it is
running?
8. Explain the operation of a DC series motor under no-load condition.
9. How can the direction of rotation of a shunt dc motor be reversed?
10. How can the direction of rotation of a series dc motor be re versed?