A dc shunt motor operating unloaded at a terminal voltage of 125V at a speed of 1420 rpm. When the motor is operated unloaded at the same terminal voltage but with an additional resistance of 8Ω in series with the shunt field, the motor speed is 1560rpm. (Ignore armature reaction and magnetic saturation) a) Calculate the resistance of the shunt field. b) Calculate the motor speed if the series resistance is increased from 8Ω to20Ω. c) With the field resistance at its original value and no series resistance, calculate the motor speed if it is operated loaded at a terminal voltage of 90 V and a terminal current of 100A.
A dc shunt motor operating unloaded at a terminal voltage of 125V at a speed of 1420 rpm. When the motor is operated unloaded at the same terminal voltage but with an additional resistance of 8Ω in series with the shunt field, the motor speed is 1560rpm. (Ignore armature reaction and magnetic saturation) a) Calculate the resistance of the shunt field. b) Calculate the motor speed if the series resistance is increased from 8Ω to20Ω. c) With the field resistance at its original value and no series resistance, calculate the motor speed if it is operated loaded at a terminal voltage of 90 V and a terminal current of 100A.
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3. A dc shunt motor operating unloaded at a terminal voltage of 125V at a speed of 1420 rpm. When the
motor is operated unloaded at the same terminal voltage but with an additional resistance of 8Ω in series
with the shunt field, the motor speed is 1560rpm. (Ignore armature reaction and magnetic saturation)
a) Calculate the resistance of the shunt field.
b) Calculate the motor speed if the series resistance is increased from 8Ω to20Ω.
c) With the field resistance at its original value and no series resistance, calculate the motor speed if it is
operated loaded at a terminal voltage of 90 V and a terminal current of 100A.
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