Exam 18: Ac Generators Alternators

Direct current is less expensive to produce and transmit than alternating current.

In an alternator, it is necessary to provide direct current for the field circuit.

The phase sequence describes the order in which the currents follow one another.

What is another name for a rotary converter?

What is one factor that affects the output voltage of an alternator?

When alternators are connected in parallel, the phase rotation of the alternator and the distribution bus must be ____.

What instrument is used to determine whether the frequency of an alternator to be brought on line matches the frequency of the bus?

In a delta-connected alternator, the line voltage is equal to ____ times the phase voltage.

In a balanced three-phase system, the power factor is the____ of the angle between the phase current and the phase voltage.

Which is the prime mover in a motor-generator set?

In a wye-connected alternator, the line voltage is equal to ____ times the phase voltage.

The ____ method for synchronizing alternators is generally used only for small operations or for laboratory experiments.

Frequency is calculated by taking the number of field poles on the alternator, multiplying by ____, and then dividing their product by 120.

The wye connection, sometimes called a star connection, is a method of connecting coils together inside the alternator.

The standard frequency for power distribution in the US is 120 Hz.