ADM 109 - UNIT 16

What is the average voltage of a full-wave rectified 240 V RMS AC voltage?

216.17 V

What is the RMS value of an AC voltage that has a 480 V peak?

339.46 V

What is the peak voltage of a 277 V RMS AC voltage?

391.68 V

_____ is the square root of the mean of the square of the instantaneous currents.

RMS

A triangle wave is waveform in which voltage rises at a constant rate with respect to time.

True

If an AC waveform is rectified and converted into DC, the voltage value that results is the _____ value.

average

Each complete waveform of 360° is called a _____.

cycle

A term used to indicate the same value as the RMS value is the _____ value.

effective

The number of cycles completed in one second is called a _____.

frequency

The unit of frequency is _____.

hertz

When current rises and falls at the same rate as the voltage and reverses the direction of flow when the voltage reverses polarity, the current is said to be _____ with the voltage.

in phase

A(n) _____ load contains pure resistance.

resistive

When AC voltage is rectified and converted into DC, the resulting waveform is normally not pure, flat DC. The pulses that occur are called _____.

ripples

Rotating machines normally produce a waveform called a _____ wave.

sine

The most common of all AC waveforms is the _____ wave.

sine

The_____ effect occurs when AC induces eddy currents into the conductor, which cause the electrons to be repelled toward the outer surface of the conductor.

skin

To help overcome the problem of skin effect in high-frequency circuits, conductors with a large amount of _______________ must be used.

surface area

In a DC circuit, the product of volts times the amperes is called _____ power.

true

The unit of measure of the power delivered to the load in a DC circuit is _____.

watts

The amplitude of a waveform is measured from _____.

zero to the highest value obtained in either direction

A wave in which the voltage rises at a constant rate with respect to time is a _____ wave.

linear

Square waves are generally produced by electronic devices called _____.

oscillators

The maximum point of a waveform is called the _____.

peak