1. A d.c. shunt generator running at 850 r.p.m. gave the followig O.C.C. data : Field current (A) : 0.5 1 2 3 4 5 E.M.F. (V) : 10 60 120 199 232 248 258 If the resistance of the shunt field is 50 N, determine the additional resistance required in the shunt field circuit to give 240 V at a speed of 1000 r.p.m.

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1. A d.c. shunt generator running at 850 r.p.m. gave the followig O.C.C.
data :
Field current (A) :
0.5
1
2
3
4
5
E.M.F. (V) :
10 60
120
199 232 248
258
If the resistance of the shunt field is 50 Q, determine the additional
resistance required in the shunt field circuit to give 240 V at a speed of
1000 r.p.m.
Transcribed Image Text:1. A d.c. shunt generator running at 850 r.p.m. gave the followig O.C.C. data : Field current (A) : 0.5 1 2 3 4 5 E.M.F. (V) : 10 60 120 199 232 248 258 If the resistance of the shunt field is 50 Q, determine the additional resistance required in the shunt field circuit to give 240 V at a speed of 1000 r.p.m.
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