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If the torque is in the direction of rotation, the DC machine acts as
- a)generator
- b)motor
- c)amplidyne
- d)any of the mentioned
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
If the torque is in the direction of rotation, the DC machine acts asa...
The electromagnetic torque generated in the dc generator is in the direction in which the prime mover is rotated.It is produced due to the action of armature current and stator field.
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If the torque is in the direction of rotation, the DC machine acts asa...
DC Machine as Generator
A DC machine can act as either a generator or a motor depending on the direction of current flow in the armature and the magnetic field. If the torque produced by the machine is in the direction of rotation, it acts as a generator.
Explanation:
When a DC machine is connected to an external circuit and rotated by an external force, a voltage is induced in the armature windings. This induced voltage opposes the external voltage that is applied to the machine. If the armature current flows in the direction that produces a torque in the opposite direction to the applied force, the machine acts as a motor, converting electrical energy into mechanical energy. On the other hand, if the armature current flows in the direction that produces a torque in the same direction as the applied force, the machine acts as a generator, converting mechanical energy into electrical energy.
In a DC generator, the magnetic field is stationary, and the armature rotates. The armature conductors cut the magnetic field lines, and an emf is induced in them, which is proportional to the speed of rotation and the strength of the magnetic field. The induced emf produces an armature current that flows in a direction that opposes the change in the magnetic field that produced it. This current creates a magnetic field that interacts with the stationary field to produce a torque in the direction of rotation.
Conclusion:
Therefore, if the torque produced by the machine is in the direction of rotation, it acts as a generator. The generator converts mechanical energy into electrical energy and is used in power plants and other applications where electrical energy is required.
A DC machine can act as either a generator or a motor depending on the direction of current flow in the armature and the magnetic field. If the torque produced by the machine is in the direction of rotation, it acts as a generator.
Explanation:
When a DC machine is connected to an external circuit and rotated by an external force, a voltage is induced in the armature windings. This induced voltage opposes the external voltage that is applied to the machine. If the armature current flows in the direction that produces a torque in the opposite direction to the applied force, the machine acts as a motor, converting electrical energy into mechanical energy. On the other hand, if the armature current flows in the direction that produces a torque in the same direction as the applied force, the machine acts as a generator, converting mechanical energy into electrical energy.
In a DC generator, the magnetic field is stationary, and the armature rotates. The armature conductors cut the magnetic field lines, and an emf is induced in them, which is proportional to the speed of rotation and the strength of the magnetic field. The induced emf produces an armature current that flows in a direction that opposes the change in the magnetic field that produced it. This current creates a magnetic field that interacts with the stationary field to produce a torque in the direction of rotation.
Conclusion:
Therefore, if the torque produced by the machine is in the direction of rotation, it acts as a generator. The generator converts mechanical energy into electrical energy and is used in power plants and other applications where electrical energy is required.
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