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A d.c. series motor is accidentally connected to single phase supply. The torque produced will be
- a)of zero average value
- b)pulsating and unidirectional
- c)oscillating
- d)steady and unidirectional
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A d.c. series motor is accidentally connected to single phase supply. ...
Explanation:
When a d.c. series motor is accidentally connected to a single-phase supply, the torque produced will be pulsating and unidirectional. This is due to the following reasons:
1. Unidirectional torque: The d.c. series motor is designed to operate on a d.c. supply, which provides a constant unidirectional torque. However, when it is connected to a single-phase supply, the flux in the motor windings pulsates due to the alternating nature of the supply voltage. This causes the torque to also pulsate in the same manner.
2. Pulsating torque: The torque produced by the motor is directly proportional to the flux in the motor windings. As the flux pulsates due to the single-phase supply, the torque also pulsates with the same frequency. This results in a pulsating torque output from the motor.
3. No average value: The pulsating torque produced by the motor has no average value over a complete cycle. This is because the torque alternates between positive and negative values, resulting in a net torque of zero over a complete cycle.
Therefore, the torque produced by a d.c. series motor when accidentally connected to a single-phase supply is pulsating and unidirectional, with no average value over a complete cycle.
When a d.c. series motor is accidentally connected to a single-phase supply, the torque produced will be pulsating and unidirectional. This is due to the following reasons:
1. Unidirectional torque: The d.c. series motor is designed to operate on a d.c. supply, which provides a constant unidirectional torque. However, when it is connected to a single-phase supply, the flux in the motor windings pulsates due to the alternating nature of the supply voltage. This causes the torque to also pulsate in the same manner.
2. Pulsating torque: The torque produced by the motor is directly proportional to the flux in the motor windings. As the flux pulsates due to the single-phase supply, the torque also pulsates with the same frequency. This results in a pulsating torque output from the motor.
3. No average value: The pulsating torque produced by the motor has no average value over a complete cycle. This is because the torque alternates between positive and negative values, resulting in a net torque of zero over a complete cycle.
Therefore, the torque produced by a d.c. series motor when accidentally connected to a single-phase supply is pulsating and unidirectional, with no average value over a complete cycle.
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Community Answer
A d.c. series motor is accidentally connected to single phase supply. ...
In DC series motor, the AC currents through the field and armature winding will be unidirectional by commutator and brushes. So torque will be unidirectional but pulsating due to AC.
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