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Answer :

The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.

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Answer : The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

Description : A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

Answer : A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

Answer : As the load is increased the speed of D.C. shunt motor will reduce slightly.

Answer : In a D.C. shunt motor, speed is independent of armature current.

Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.