the motor is said to be fully loaded
the torque generated is maximum
the excitation is said to be zero per cent
the excitation is said to be hundred per cent
Answer is Right!
Answer is Wrong!
The correct answer is: C. the excitation is said to be zero per cent.
When the back emf generated in the armature at noload is approximately equal to the applied voltage, then the excitation is said to be zero per cent. This is because the motor is not taking any current from the supply, and the only current flowing is the magnetization current. The magnetization current is the current that flows through the field winding to create the magnetic field that induces the back emf in the armature.
The other options are incorrect because:
- A. the motor is said to be fully loaded is incorrect because the motor is not taking any current from the supply.
- B. the torque generated is maximum is incorrect because the torque generated is proportional to the square of the current, and the current is zero when the excitation is zero per cent.
- D. the excitation is said to be hundred per cent is incorrect because the excitation is zero per cent when the back emf generated in the armature at noload is approximately equal to the applied voltage.