Canadian Basic pool, section 3-17

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Subelement 3

Station Assembly, Practice and Safety

Section 3-17

power supply fundamentals

3-17-01

If your mobile transceiver works in your car but not in your home, what should you check first?

Correct Answer
A.
The power supply
B.
The speaker
C.
The microphone
D.
The SWR meter

3-17-01

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3-17-02

What device converts household current to 12 VDC?

A.
A low pass filter
Correct Answer
B.
A power supply
C.
An RS-232 interface
D.
A catalytic converter

3-17-02

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3-17-03

Which of these usually needs a heavyduty power supply?

A.
An antenna switch
B.
A receiver
Correct Answer
C.
A transceiver
D.
An SWR meter

3-17-03

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3-17-04

What may cause a buzzing or hum in the signal of an AC-powered transmitter?

Correct Answer
A.
A bad filter capacitor in the transmitter's power supply
B.
Using an antenna which is the wrong length
C.
Energy from another transmitter
D.
Bad design of the transmitter's RF power output circuit

3-17-04

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3-17-05

A power supply is to supply DC at 12 volts at 5 amperes. The power transformer should be rated higher than:

A.
17 watts
B.
2.4 watts
C.
6 watts
Correct Answer
D.
60 watts

3-17-05

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3-17-06

The diode is an important part of a simple power supply. It converts AC to DC, since it:

A.
has a high resistance to AC but not to DC
Correct Answer
B.
allows electrons to flow in only one direction from cathode to anode
C.
has a high resistance to DC but not to AC
D.
allows electrons to flow in only one direction from anode to cathode

3-17-06

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3-17-07

To convert AC to pulsating DC, you could use a:

A.
transformer
B.
capacitor
Correct Answer
C.
diode
D.
resistor

3-17-07

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3-17-08

Power-line voltages have been made standard over the years and the voltages generally supplied to homes are approximately:

Correct Answer
A.
120 and 240 volts
B.
110 and 220 volts
C.
100 and 200 volts
D.
130 and 260 volts

3-17-08

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3-17-09

So-called "transformerless" power supplies are used in some applications (notably tube-type radios and TV receivers). When working on such equipment, one should be very careful because:

A.
DC circuits are negative relative to the chassis
B.
chassis connections are grounded by the centre pin of the power source's plug
C.
the load across the power supply is variable
Correct Answer
D.
one side of the line cord is connected to the chassis

3-17-09

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3-17-10

If household voltages are consistently high or low at your location, this can be corrected by the use of:

A.
a full-wave bridge rectifier
Correct Answer
B.
an autotransformer
C.
a variable voltmeter
D.
a proper load resistance

3-17-10

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3-17-11

You have a very loud low- frequency hum appearing on your transmission. In what part of the transmitter would you first look for the trouble?

Correct Answer
A.
the power supply
B.
the variable-frequency oscillator
C.
the driver circuit
D.
the power amplifier circuit

3-17-11

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