Question

The field windings of a  generator have a resistance of 620  Ω  at a temperature of 55  0 C.  What will be the resistance  of the windings when the machine temperature rises on full load to 80  0  C? (α  0  =  0.0042​

Answer 1

Answer:

p = 4/2 = 2, Z = 1000, ( = Wb, n = 600/60 = 10 rev/s

(a) For wave wound, c = 2, hence, generated e.m.f., E =

= 400 V

(b) For lap wound, c = 2p, hence, generated e.m.f., E =

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