A250 V, dc shunt matar has an ameture resistance of 0.5 chmand a field resistance of 250 chm When driving a load of canstant torque at 600 r.pm, the armature current is 20 A If it is desired to raise the speed fram600 to 800 r.pm, what resistance should be inserted in the shunt field circut? Assume that the magnetic circut is unsaturated

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A250 V, dc shunt motar has an armeture resistance of 0.5 chmand a field resistance
of 250 chm When driving a load of constant torque at 600 r.pm, the amature current
is 20 A If it is desired to raise the speed from600 to 800 r.pm, what resistance should
be inserted in the shunt field circut? Assume that the megnetic circut is unsaturated
Transcribed Image Text:A250 V, dc shunt motar has an armeture resistance of 0.5 chmand a field resistance of 250 chm When driving a load of constant torque at 600 r.pm, the amature current is 20 A If it is desired to raise the speed from600 to 800 r.pm, what resistance should be inserted in the shunt field circut? Assume that the megnetic circut is unsaturated
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