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The effect of inserting a resistance in series with the field winding of a shunt motor is to
- a)increase the magnetic field
- b)increase the speed of the motor
- c)decrease the armature current
- d)reduce the speed of the motor
Correct answer is option 'B'. Can you explain this answer?
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The effect of inserting a resistance in series with the field winding ...
Effect of inserting a resistance in series with the field winding of a shunt motor
Increasing the speed of the motor
When a resistance is inserted in series with the field winding of a shunt motor, the total resistance of the circuit increases. This causes a decrease in the field current, which in turn reduces the magnetic field strength produced by the field winding. As a result, the back EMF of the motor decreases, which allows the armature current to increase.
The increased armature current produces a larger torque, which results in an increase in the speed of the motor. This is because the motor speed is directly proportional to the armature current and inversely proportional to the back EMF.
Therefore, the insertion of a resistance in series with the field winding of a shunt motor increases the speed of the motor.
Decreasing the armature current
Although the armature current initially increases due to the insertion of the resistance, the overall effect is a decrease in the armature current. This is because the increased speed of the motor results in a higher back EMF, which counteracts the applied voltage and reduces the armature current.
Conclusion
In summary, inserting a resistance in series with the field winding of a shunt motor can increase the speed of the motor by decreasing the magnetic field strength, which allows for an increase in armature current and subsequent increase in torque. Additionally, this can result in a decrease in the armature current due to the higher back EMF produced by the increased speed.
Increasing the speed of the motor
When a resistance is inserted in series with the field winding of a shunt motor, the total resistance of the circuit increases. This causes a decrease in the field current, which in turn reduces the magnetic field strength produced by the field winding. As a result, the back EMF of the motor decreases, which allows the armature current to increase.
The increased armature current produces a larger torque, which results in an increase in the speed of the motor. This is because the motor speed is directly proportional to the armature current and inversely proportional to the back EMF.
Therefore, the insertion of a resistance in series with the field winding of a shunt motor increases the speed of the motor.
Decreasing the armature current
Although the armature current initially increases due to the insertion of the resistance, the overall effect is a decrease in the armature current. This is because the increased speed of the motor results in a higher back EMF, which counteracts the applied voltage and reduces the armature current.
Conclusion
In summary, inserting a resistance in series with the field winding of a shunt motor can increase the speed of the motor by decreasing the magnetic field strength, which allows for an increase in armature current and subsequent increase in torque. Additionally, this can result in a decrease in the armature current due to the higher back EMF produced by the increased speed.
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The effect of inserting a resistance in series with the field winding of a shunt motor is toa)increase the magnetic fieldb)increase the speed of the motorc)decrease the armature currentd)reduce the speed of the motorCorrect answer is option 'B'. Can you explain this answer?
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