In applied voltage is reduced in a dc shunt motor
A. Full load torque.
B. Full load current.
C. Full load speed.
D. None of these.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
If the applied voltage is reduced in a DC shunt motor, the parameter that is directly affected is the full load current.
In a DC shunt motor, the speed is mainly determined by the back electromotive force (EMF) generated in the armature winding, which is proportional to the applied voltage. By reducing the applied voltage, the back EMF decreases, which in turn leads to an increase in the armature current.
According to Ohm’s Law (I = V/R), if the voltage (V) decreases and the resistance (R) remains constant, the current (I) will increase. In this case, the reduction in applied voltage causes an increase in the armature current.
The full load torque and full load speed of a DC shunt motor are primarily influenced by the field current and the mechanical load on the motor, rather than the applied voltage. Therefore, they are not directly affected by a reduction in applied voltage.
Therefore, the correct answer is B: Full load current. The applied voltage reduction in a DC shunt motor will directly affect the full load current.