DC GENERATOR

Question 1

What’s the Excited Generator?

Answer 1

Field winding or coil is energized by a separate DC source
The flux produced by the poles depends upon the field current with the unsaturated region of magnetic material of the poles. ( flux is directly proportional to the field current.)
Saturated region (the flux remains constant).

Question 2

Separately excited DC Generator?
Formulae

Answer 2

V=Eg-IaRa (1)
V=Eg-IaRa-2vb (2)
Power developed = EgIa ( 3)
Power output = VIL =VIa (4)

Question 3

Self excited DC Generator?

Answer 3

Current to field winding is supplied by the Generator itself. Field coils should be connected in parallel, armature in series. They can be connected partly.

Question 4

Shunt wound Generator?

Answer 4

The field winding is connected across armature winding forming a parallel or shunt circuit. ( full terminal voltage is applied across it )
Small field current is applied flows ( winding has many turns of fine wire) has high resistance of the order of 100 ohms .

Question 5

Shunt wound Generator

Answer 5

Shunt field current (Ish= V/Rsh)
Ia=iL+Ish
V=Eg-ia Ra
V=Eg-IaRa-2vb
Power developed = EgIa
Power output = ViL