Question 247Electricity/Electronics - QMED70% to pass
Which of the following statements describes what will happen when both the polarity of the field poles, and the direction of current to the brushes of a DC motor are reversed?
AI Explanation
The correct answer is A) The direction of rotation of the armature will remain the same.
When both the polarity of the field poles and the direction of current to the brushes of a DC motor are reversed, the magnetic field in the motor remains unchanged. Since the direction of the magnetic field and the direction of the current in the armature windings are both reversed, the torque produced and the direction of rotation of the armature will remain the same.
The other options are incorrect because: B) The motor will still start since the magnetic field and current in the armature are reversed together, C) The direction of rotation will not be reversed, and D) The field pole windings will not become overheated since the magnetic field is unchanged.
Related Questions
#245 What is the function of the commutator associated with a DC motor? #246 In DC motor construction, where are the commutating windings wound? #248 The counter EMF of a DC motor is maximum when the _______________.#249 What will happen if you reverse both the field and the armature connections of a DC propulsion motor? #250 What is an advantage of DC motors over AC motors?