Final answer:
The incorrect statement about induced voltage in AC machines is that the amplitude of the induced voltage is inversely proportional to the angular velocity. Instead, it is directly proportional to the angular velocity due to the relation described by Faraday's Law where induced emf increases with the rate of change of magnetic flux.
Step-by-step explanation:
The statement that is NOT correct about the induced voltage in AC machines is: c) The amplitude of the induced voltage is inversely proportional to the angular velocity. This statement is incorrect because the amplitude of the induced voltage is actually proportional to the angular velocity. Faraday's Law indicates that the induced electromotive force (emf) in any closed circuit is equivalent to the rate of change of the magnetic flux through the circuit. Hence, as the angular velocity increases, the rate of change of magnetic flux increases, leading to a higher induced emf or voltage.
It is also important to note that:
- The induced voltage in AC machines is typically a sinusoidal waveform.
- The amplitude of the induced voltage is indeed proportional to the flux linking the coils.
- The amplitude of the induced voltage is also dependent on the construction of the machine which includes factors such as the number of coils and the magnetic core material.