AC Theory LVL III

Gain is the ratio of the amplitude of the input signal to the amplitude of the output signal.

The shunt field has a ? resistance because it is made of ? wire.

A(n) ? is an acoustical unit used to measure the intensity (volume) of sound.

A clamp-on ammeter measures current in a circuit by measuring the strength of the ? around a single conductor

The MIN-MAX mode on a digital multimeter can be used when recording ? measurements.

A(n) ? of a voltage indicator is its inability to indicate the voltage amount.

A series generator is self-excited with residual ? .

The addition of resistance to a reactive series circuit always ? the phase angle and ? the PF of the circuit

In a 3-phase generator, the three sets of windings are placed ? apart.

? leakage current that flows from areas on conductors where insulation has been removed to allow electrical connections

A revolving armature AC generator has each end of the rotating loops or winding connected to what component(s)

The MIN-MAX mode on a digital multimeter can be used when recording ? measurements.

Another method of paralleling two alternators is with the use of a synchroscope.

A rotating exciter mounted on the same shaft as the main generator is usually called a(n) ? exciter.

Which of the factors listed contributes to the economic feasibility of making power factor corrections?

Resistive power is also known as ? power.

A series generator is self-excited with residual ? .

There is no limit to the amount of power that can be generated with the revolving armature type of generator.

Power factor correction of ? to ? percent is considered good practice.

The decibel scale is a feature found on ? .

The DC voltage and current that is supplied to the field of a generator is called the ? power.

The vertical (y) axis on an oscilloscope represents the ? of the waveform.

The power factor of a purely resistive circuit is ? .

Increasing the turns or loops of wire on the rotating armature of a generator would cause a(n) ? output of the generator

Permanent magnets are used sometimes as the field poles in small generators.

There are two basic wiring schemes for 3-phase systems. These are wye and delta connections.

Reactive power is expressed in units of ? .

Many test instruments include a(n) ? in the current-measuring circuit to prevent damage caused by excessive current.

For a delta connected system, the line voltage is in ? with the phase voltage.

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The apparent power in an AC circuit equals ET x IT.

What meter function should be used to test the difference between one or more values against another?

Most electrical power generated today is ? .

The source for mechanical motion supplied to a generator is referred to as the ? .

A(n) ? is an acoustical unit used to measure the intensity (volume) of sound.

The two primary magnetic flux fields in a generator are field flux and armature flux.

As the phase angle is decreased, the power factor is ? .

Large-capacity generators are often enclosed in a(n) ? atmosphere for cooling purposes.

The ? is the rotating member of a generator or motor.

What are the two types of connections for generator field windings?

One full revolution of a 4-pole generator will result in ? cycle(s) of output.

Power factor is normally corrected by adding a(n) ? in parallel with the load

To determine the frequency of the waveform, divide the ? into 1.

An ohmmeter is a test instrument that measures ? , the opposition to the flow of electrons in a circuit.

For a wye connected system, the line current is in ? with the phase current.

The horsepower ratings of three-phase motors are about ? those of single-phase motors with similar frame sizes.

You can use a(n) ? to make a rough test on a triac that has been removed from a circuit.

The larger the amplitude of a sound wave, the ? the sound produced.

A single coil generator spinning in a magnetic field will produce a full sine wave for every ? of rotation.

In a purely inductive circuit, current will ? the voltage by ? degrees.