Briefly explain the construction and operation of a DC Shunt motor. (b) A dc shunt machine ( 10 kW, 250 V, 1200 rpm) had armature resistance of 0.25 Ω. The machine is connected to 250 V dc supply, draws rated armature current ad rotates at 1200 rpm i. Determine the generated voltage, the electromagnetic power developed and the torque developed. ii. The mechanical load on the motor shaft is disconnected, and the motor draws 4 A armature current, determine the speed and rotational loss

University Physics Volume 2
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Chapter13: Electromagnetic Induction
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Problem 74AP: The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected...
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(a) Briefly explain the construction and operation of a DC Shunt motor.

(b) A dc shunt machine ( 10 kW, 250 V, 1200 rpm) had armature resistance of 0.25 Ω. The
machine is connected to 250 V dc supply, draws rated armature current ad rotates at 1200
rpm
i. Determine the generated voltage, the electromagnetic power developed and the torque
developed.
ii. The mechanical load on the motor shaft is disconnected, and the motor draws 4 A
armature current, determine the speed and rotational loss
(Ignore armature reaction)

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