DC Motor Questions & Answers PDF

Here are some important questions, points, and MCQs that can be derived from the given image and its context about the DC motor: Questions: \* What is the role of the commutator in a DC motor? \* How does the commutator reverse the current direction in the coil? \* Why is it necessary to reverse...

Here are some important questions, points, and MCQs that can be derived from the given image and its context about the DC motor: Questions: \* What is the role of the commutator in a DC motor? \* How does the commutator reverse the current direction in the coil? \* Why is it necessary to reverse the current direction in the coil for continuous rotation? \* What happens when the coil becomes vertical and the commutator gaps align with the brushes? \* How does the inertia of the coil help maintain rotation? \* What is the significance of the commutator in ensuring continuous clockwise rotation? \* What is the relationship between the commutator, current direction, and torque? Points: \* Commutator: A split ring that reverses the current direction in the coil. \* Reversal of Current: Essential for continuous rotation of the coil. \* Vertical Position: When the coil is vertical, the current stops flowing momentarily. \* Inertia: Helps the coil continue rotating even when the current stops. \* Clockwise Rotation: The commutator ensures consistent clockwise rotation. \* Torque and Current: The direction of torque is directly related to the direction of current in the coil. MCQs: \* What is the function of the commutator in a DC motor? a\) To generate a magnetic field b\) To provide electrical insulation c\) To reverse the current direction in the coil d\) To increase the speed of rotation \* When does the current in the coil stop flowing? a\) When the coil is horizontal b\) When the coil is vertical c\) When the motor is at rest d\) When the commutator is not functioning \* Which of the following is NOT true about the commutator? a\) It is a split ring. b\) It reverses the current direction. c\) It is stationary. d\) It ensures continuous rotation. \* What is the role of inertia in the DC motor? a\) To generate torque b\) To maintain rotation when the current stops c\) To reverse the current direction d\) To increase the speed of rotation \* What is the relationship between the commutator and the direction of rotation? a\) The commutator determines the direction of rotation. b\) The commutator has no effect on the direction of rotation. c\) The direction of rotation determines the action of the commutator. d\) The commutator and the direction of rotation are independent. Answers: \* c) To reverse the current direction in the coil \* b) When the coil is vertical \* c) It is stationary. \* b) To maintain rotation when the current stops \* a) The commutator determines the direction of rotation. Let me know if you\'d like more questions or a deeper dive into any specific aspect!