QI The following figures give the O.c.C. of d.c. Shunt generator driven at a constant speed of 700 r.p.m. 40 Terminal voltage (V): 80 Field Current (A) : 0.5 Determine the critical resistance at (a) 700 r.p.m. (b) 850 r.p.m. If resistance of field coils is 50 2, find the range of the field rheostat required to vary the voltage between the limits of 180 V and 250 V on open circuit at a speed of 700 r.p.m. 10 20 120 160 200 240 260 0.1 0.24 0.77 1.2 1.92 3.43 5.2
QI The following figures give the O.c.C. of d.c. Shunt generator driven at a constant speed of 700 r.p.m. 40 Terminal voltage (V): 80 Field Current (A) : 0.5 Determine the critical resistance at (a) 700 r.p.m. (b) 850 r.p.m. If resistance of field coils is 50 2, find the range of the field rheostat required to vary the voltage between the limits of 180 V and 250 V on open circuit at a speed of 700 r.p.m. 10 20 120 160 200 240 260 0.1 0.24 0.77 1.2 1.92 3.43 5.2
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Transcribed Image Text:Q The following figures give the O.c.C. of d.c.
Shunt generator driven at a constant speed of 700
r.p.m.
40
Terminal voltage (V):
120
10
20
80
160
200
240
260
Field Current (A) :
0.1
0.24
0.5
1.92
1.2
Determine the critical resistance at (a) 700 r.p.m.
(b) 850 r.p.m. If resistance of field coils is 50 2,
find the range of the field rheostat required to vary
the voltage between the limits of 180 V and 250 V
on open circuit at a speed of 700 r.p.m.
0.77
3.43
5.2
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