Q4) A 220 V, d.c. shunt motor has an armature resistance of 0.4 2 and a field resistance of 220 2. When driving a load of constant torque at 500 r.p.m., the armature current is 15 A. If it is desired to raise the speed from 500 to 700 r.p.m., what resistance should be inserted in the shunt field circuit? Assume that the magnetic circuit is unsaturated.

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Q4) A 220 V, d.c. shunt motor has an armature resistance of 0.4 Q and a field resistance of 220 2. When driving
a load of constant torque at 500 r.p.m., the armature current is 15 A. If it is desired to raise the speed from
500 to 700 r.p.m., what resistance should be inserted in the shunt field circuit? Assume that the magnetic
circuit is unsaturated.
Transcribed Image Text:Q4) A 220 V, d.c. shunt motor has an armature resistance of 0.4 Q and a field resistance of 220 2. When driving a load of constant torque at 500 r.p.m., the armature current is 15 A. If it is desired to raise the speed from 500 to 700 r.p.m., what resistance should be inserted in the shunt field circuit? Assume that the magnetic circuit is unsaturated.
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