Synchronous Machines

Question 1

What are the effects or rotor excitation?

Answer 1

When stator is energized, the expanding and collapsing magnetic field cuts the stator conductors & induces CEMF

Question 2

The CEMF is _____ out of phase with the applied voltage

Answer 2

180°

Question 3

What must there be to create CEMF?

Answer 3

a magnetic field

Question 4

what is the current called that creates the magnetic field?

Answer 4

Magnetizing current, Excitation Current

Question 5

The CEMF & magnetizing current is called ______

Answer 5

Reactive Power

Question 6

what improves by the magnetic field being energized by DC instead of the AC?

Answer 6

the PF will improve

Question 7

Under excited fields have _____ PF’s

Answer 7

Lagging

Question 8

Over excited fields have ____ PF’s

Answer 8

Leading

Question 9

Describe Synchronous Capacitors and what are their other names?

Answer 9

Sync capacitors have no output shafts and are used only to correct PF
“ Rotating capacitors”
“Synchronous Condensers”