Canadian Advanced pool, section 4-01

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Subelement 4

Power Supplies

Section 4-01

transformer and rectifier circuits, voltage doubler circuit, PIP

4-01-01

For the same transformer secondary voltage, which rectifier has the highest average output voltage?

A.
Half-wave
B.
Quarter-wave
Correct Answer
C.
Bridge
D.
Full-wave

4-01-01

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4-01-02

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.

A.
0.45
Correct Answer
B.
2.8
C.
5.6
D.
l.4

4-01-02

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4-01-03

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

A.
0.636
Correct Answer
B.
2.8
C.
0.707
D.
1.4

4-01-03

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4-01-04

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.
any output filtering
B.
a centre-tapped primary on the transformer
Correct Answer
C.
a centre-tapped secondary on the transformer
D.
diodes across each leg of the transformer

4-01-04

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4-01-05

The output from a full-wave bridge rectifier circuit will appear to be:

A.
double that of the full-wave centre-tap rectifier
B.
half that of the full-wave centre-tap rectifier
Correct Answer
C.
the same as the full-wave centre-tap rectifier
D.
the same as the half-wave rectifier

4-01-05

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4-01-06

The ripple frequency produced by a fullwave power supply connected to a normal household circuit is:

Correct Answer
A.
l20 Hz
B.
60 Hz
C.
90 Hz
D.
30 Hz

4-01-06

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4-01-07

The ripple frequency produced by a halfwave power supply connected to a normal household circuit is:

A.
90 Hz
Correct Answer
B.
60 Hz
C.
l20 Hz
D.
30 Hz

4-01-07

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4-01-08

Full-wave voltage doublers:

A.
create four times the half-wave voltage output
B.
use less power than half-wave doublers
Correct Answer
C.
use both halves of an AC wave
D.
are used only in high-frequency power supplies

4-01-08

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4-01-09

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

A.
Average power; average voltage
B.
Capacitive reactance; avalanche voltage
C.
Peak load impedance; peak voltage
Correct Answer
D.
Peak inverse voltage; average forward current

4-01-09

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4-01-10

Why should a resistor and capacitor be wired in parallel with power-supply rectifier diodes?

A.
To smooth the output waveform
Correct Answer
B.
To equalize voltage drops and guard against transient voltage spikes
C.
To decrease the output voltage
D.
To ensure that the current through each diode is about the same

4-01-10

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4-01-11

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

A.
A steady DC voltage
B.
A sine wave at half the frequency of the AC input
Correct Answer
C.
A series of pulses at twice the frequency of the AC input
D.
A series of pulses at the same frequency as the AC input

4-01-11

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