The expected answers were:
- (i) Series motor
(ii) Compound motor
- (i) E = V - IaRa
The voltage drop across the armature is
E – V = IaRa = 200 -179 = 21 V
(ii) Ia =
Ia =
- Armature current at standstill, Ia =
= = 2857.14 A
The question was on D.C. Electrical Machines. The question was popular with the candidate. The performance of the candidates was average.
Many of the candidates could not provide answers to part (a) of the question. However, almost all the candidates got the calculation part correct, though some did not understand the implication of standstill.