A 3-phase, star connected alternator having a rotating armature will have 4 slip rings but 3-phase, delta connected alternator having armature will have

6 slip rings

4 slip rings

3 slip rings

2 slip rings

phase sequence meter

synchroscope

power factor meter

tachometer

indicate the correct instant of synchronizing two alternators

connect the incoming alternator to the bus bar

adjust the frequency of incoming alternator

indicate the correct phase sequence of the incoming alternator and bus bar

increase the eddy current losses

reduce the eddy current losses

increase the magnetic flux

decrease the speed of the rotor

oscillating

minimum

zero

maximum