Question 1

If the power supply must furnish several amps, only a few microfarads of capacitance will be needed.

Accepted Answer

For a power supply that must furnish several amps, typically more capacitance is needed, often in the range of hundreds to thousands of microfarads, to ensure smooth voltage output and to handle the load effectively. A few microfarads would not be sufficient for such applications.

Question 2

The output voltage of a full-wave (or any other) rectifier is called the ____.&#10;A) median value&#10;B) average value&#10;C) lateral value&#10;D) limiting value

Accepted Answer

The output voltage of a full-wave rectifier is referred to as the average value because it represents the average of all the voltage values over a complete cycle, excluding the portions that are rectified to zero in the case of half-wave rectification.

Question 3

An isolation transformer has its primary and secondary winding physically and electrically connected&#160; to each other.

Accepted Answer

An isolation transformer is designed so that its primary and secondary windings are electrically isolated from each other to prevent direct current flow from one circuit to the other.

Question 4

A voltage surge is defined as a dramatic increase in voltage lasting up to 50 microseconds

Accepted Answer

A voltage surge is defined as a dramatic increase in voltage lasting up to 50 microseconds.

Question 5

A(n) ____ is used to filter voltage.&#10;A) filter&#10;B) capacitor&#10;C) inductor&#10;D) rectifier

Accepted Answer

A capacitor is used to filter voltage by smoothing out fluctuations in the power supply, often in conjunction with rectifiers in power supply circuits.

Question 6

The ____ does for current what the capacitor does for voltage.&#10;A) block coil&#10;B) shunt coil&#10;C) phase coil&#10;D) choke coil

Accepted Answer

The choke coil does for current what the capacitor does for voltage, by impeding the flow of high-frequency current while allowing DC or low-frequency currents to pass through.

Question 7

A discharged capacitor looks like a short circuit to ground when power is first applied to it.

Accepted Answer

When power is first applied to a discharged capacitor, it initially allows a large current to flow through it as if it were a short circuit, because its voltage is zero and it needs to charge up.

Question 8

Regardless of the type of rectifier used, DC voltage pulsates.

Accepted Answer

All types of rectifiers, whether half-wave, full-wave, or bridge, convert AC to DC, but the output is a pulsating DC voltage, not a pure DC signal. This is because the rectification process retains the frequency of the AC input, leading to a DC output that rises and falls, albeit remaining above zero.

Question 9

A ____ rectifier produces the greatest amount of ripple.&#10;A) half-wave, multi-phase&#10;B) full-wave, multi-phase&#10;C) half-wave, single-phase&#10;D) full-wave, single phase

Accepted Answer

A half-wave, single-phase rectifier produces the greatest amount of ripple because it only allows one half of the AC waveform to pass through, resulting in a more discontinuous and less smooth DC output compared to full-wave and multi-phase rectifiers, which utilize more of the AC waveform to produce a smoother DC output with less ripple.

Question 10

An inductor or ____ is used to filter the current.&#10;A) choke&#10;B) sink&#10;C) capacitor&#10;D) transformer

Accepted Answer

An inductor, also known as a choke, is used to filter the current by impeding the flow of high-frequency while allowing low-frequency currents to pass through.

Deck 8: Filters