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Why is the EMF maximum when the plane of the armature is parallel to the magnetic field?

When the plane of the armature is parallel to the lines of force of magnetic field, the rate of change of magnetic flux linked with it is maximum. Therefore, the e.m.f. induced in the armature in this orientation is maximum.

Why is EMF induced in an AC generator?

An AC (alternating current) generator utilizes Faraday’s law of induction, spinning a coil at a constant rate in a magnetic field to induce an oscillating emf. The coil area and the magnetic field are kept constant, so, by Faraday’s law, the induced emf is given by: If the loop spins at a constant rate, .

What would you do to increase the induced emf in a generator?

we can increase the induced emf in a generator in the following ways :

  1. increase the number of turns in the rotating coil.
  2. increase the area of the coils.
  3. increase the rotating speed of the coils.
  4. increase the size of the magnets. This conversation is already closed by Expert.

What is the working principle of alternator?

Working Principle of Alternator. All the alternators work on the principle of electromagnetic induction. According to this law, for producing the electricity we need a conductor, magnetic field and mechanical energy. Every machine that rotates and reproduces Alternating Current.

Why do we need to Synchronise alternator?

The need for synchronization arises when two or more alternators work together to supply the power to the load. Since electrical loads do not remain constant, the two or more generators supplying the power need to be interconnected and operate in parallel to handle larger loads.

What do you mean by synchronization of alternator?

Synchronization of alternator means connecting an alternator into grid in parallel with many other alternators, that is in a live system of constant voltage and constant frequency. Phase sequence: The phase sequence of the three phases of alternator must be similar to that of the grid or bus-bars.

When the speed of an alternator changed from 3600 rpm to 1800 rpm the generated EMF phase become?

[11] When speed of an alternator is changed from 3600 r.p.m. to 1800 r.p.m., the generated e.m.f./phases will become. (d) one-fourth.

What controls the frequency of the alternator?

Two factors affect the frequency in an alternator: rotation speed and the number of poles.

When the speed of an alternator is reduced by half the generated EMF will becomes?

Since the speed of the alternator is directly proportional to the emf of an alternator. So if the speed is reduced to half then the emf will also become one-half.

What happens when speed of alternator increases?

The speed of the alternator was measured using tachometer, digital multi-meter was used to measure battery’s voltage, and AC/DC Clamp was used to measure alternator current output. The result shows that the faster the alternator spin, the more power it can produce.

What determines the power factor of an alternator?

The power factor of an alternator depends on: Speed of rotor. Core losses. Armature losses.

What is the speed of the turbo alternators?

The rotor of a turbo generator is a non-salient pole type usually with two poles. The normal speed of a turbo generator is 1500 or 3000 rpm with four or two poles at 50 Hz (1800 or 3600 rpm with four or two poles at 60 Hz).

What is the highest possible speed of turbo alternator?

3000 rpm

What are the two types of turbo alternators?

On account of the high rotating speeds, two types of turbo- alternator rotor designs, radial-slot type and parallel-slot type are used. There are two methods to overcome the ventilation problem, radial and circumferential method.