effective 4/01/2007

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A-004-01: Transformer and rectifier circuits, voltage doubler circuit, PIP

A-004-01-01: For the same transformer secondary voltage, which rectifier has the highest average output voltage?

Bridge

Half-wave

Quarter-wave

Full-wave

A-004-01-02: In a half-wave power supply with a capacitor input filter and a load drawing little or no current, the peak inverse voltage (PIV) across the diode can reach _____ times the RMS voltage.

2.8

0.45

5.6

l.4

A-004-01-03: In a full-wave centre-tap power supply, regardless of load conditions, the peak inverse voltage (PIV) will be _____ times the RMS voltage:

2.8

0.636

0.707

1.4

A-004-01-04: A full-wave bridge rectifier circuit makes use of both halves of the AC cycle, but unlike the full-wave centre-tap rectifier circuit it does not require:

a centre-tapped secondary on the transformer

any output filtering

a centre-tapped primary on the transformer

diodes across each leg of the transformer

A-004-01-05: The output from a full-wave bridge rectifier circuit will appear to be:

the same as the full-wave centre-tap rectifier

double that of the full-wave centre-tap rectifier

half that of the full-wave centre-tap rectifier

the same as the half-wave rectifier

A-004-01-06: The ripple frequency produced by a full-wave power supply connected to a normal household circuit is:

l20 Hz

60 Hz

90 Hz

30 Hz

A-004-01-07: The ripple frequency produced by a half-wave power supply connected to a normal household circuit is:

60 Hz

90 Hz

l20 Hz

30 Hz

A-004-01-08: Full-wave voltage doublers:

use both halves of an AC wave

create four times the half-wave voltage output

use less power than half-wave doublers

are used only in high-frequency power supplies

A-004-01-09: What are the two major ratings that must not be exceeded for silicon-diode rectifiers used in power-supply circuits?

Peak inverse voltage; average forward current

Average power; average voltage

Capacitive reactance; avalanche voltage

A-004-01-10: Why should a resistor and capacitor be wired in parallel with power-supply rectifier diodes?

To equalize voltage drops and guard against transient voltage spikes

To smooth the output waveform

To decrease the output voltage

To ensure that the current through each diode is about the same

A-004-01-11: What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

A series of pulses at twice the frequency of the AC input

A sine wave at half the frequency of the AC input

A series of pulses at the same frequency as the AC input

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