ALTERNATOR - Quiz

1) What is the advantage of using rotating field type alternator?

Easy to locate the faults in the field Easy to connect the load with alternator Easy to dissipate the heat during running Two slip rings only required irrespective of No. of phases

2) What is the effect in increasing the field excitation current in alternator?

Prevents demagnetizing Over voltage protection Dead short circuit protection Alternator will be over loaded

3) Calculate the pitch factor (KP) for a winding having 36 stator slots 4 pole with angle (?) is 30? in alternator?

0.942 0.965 0.978 0.985

4) What is the cause for hunting effect in alternators?

Due to over load Running without load Running with fluctuation of speed Due to continuous fluctuation in loa