19. A 4 pole, 100 V d.c. shunt generator with lap connected armature having field and armature resistances of 50 2 and 0.1 2 respectively, supplied 60, 100 V, 40 W lamps. All lamps are connected in parallel. Calculate the total armature current and generated e.m.f. Assume brush drop to be 1 V/brush. (Ans.: 26 A, 104.6 V) 20. A short shunt compound d.c. generator supplied 7.5 kW at 230 V. The shunt field, series field and armature resistances are 100 2, 0.32 and 0.4 2 respectively. Calculate the induced e.m.f. and the load resistance. (Ans.: 253.8 V, 7) 21 A shunt generator delivers 450 A at 230 V and resistances of shunt field and armature windings are 50 2 and 0.03 2 respectively. Calculate the generated e.m.f. (Ans.: 243.638 V) 22. A 20 kW short shunt compound generator works on full load with terminal voltage of 250 V. Assume R, = 0.05 Q, R = 0.025 0 and Rsh = 100 2, calculate the generated e.m.f. (Ans.: 256.126 V)

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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19. A 4 pole, 100 V d.c. shunt generator with lap connected armature having field and armature
resistances of 50 2 and 0.1 2 respectively, supplied 60, 100 V, 40 W lamps. All lamps are
connected in parallel. Calculate the total armature current and generated e.m.f. Assume brush drop
to be 1 V/brush.
(Ans.: 26 A, 104.6 V)
20. A short shunt compound d.c. generator supplied 7.5 kW at 230 V. The shunt field, series field and
armature resistances are 100 2, 0.32 and 0.4 2 respectively. Calculate the induced e.m.f. and the
load resistance.
(Ans.: 253.8 V, 7)
21 A shunt generator delivers 450 A at 230 V and resistances of shunt field and armature windings
are 50 2 and 0.03 2 respectively. Calculate the generated e.m.f.
(Ans.: 243.638 V)
22. A 20 kW short shunt compound generator works on full load with terminal voltage of 250 V.
Assume R, = 0.05 Q, R = 0.025 0 and Rsh = 100 2, calculate the generated e.m.f.
(Ans.: 256.126 V)
Transcribed Image Text:19. A 4 pole, 100 V d.c. shunt generator with lap connected armature having field and armature resistances of 50 2 and 0.1 2 respectively, supplied 60, 100 V, 40 W lamps. All lamps are connected in parallel. Calculate the total armature current and generated e.m.f. Assume brush drop to be 1 V/brush. (Ans.: 26 A, 104.6 V) 20. A short shunt compound d.c. generator supplied 7.5 kW at 230 V. The shunt field, series field and armature resistances are 100 2, 0.32 and 0.4 2 respectively. Calculate the induced e.m.f. and the load resistance. (Ans.: 253.8 V, 7) 21 A shunt generator delivers 450 A at 230 V and resistances of shunt field and armature windings are 50 2 and 0.03 2 respectively. Calculate the generated e.m.f. (Ans.: 243.638 V) 22. A 20 kW short shunt compound generator works on full load with terminal voltage of 250 V. Assume R, = 0.05 Q, R = 0.025 0 and Rsh = 100 2, calculate the generated e.m.f. (Ans.: 256.126 V)
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