- 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.
B. allows electrons to flow in 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.
- To convert AC to pulsating DC, you could use a:
A. transformer.
B. capacitor.
C. diode.
D. resistor.
- If your mobile transceiver works in your car but not in your home, what should you
check first?
A. The power supply.
B. The speaker.
C. The microphone.
D. The SWR meter.
- What device converts household current to 12 VDC?
A. A low pass filter.
B. A power supply.
C. An RS-232 interface.
D. A catalytic converter.
- Which of these usually need a heavy duty power supply?
A. An antenna switch.
B. A receiver.
C. A transceiver.
D. An SWR meter.
- 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.
D. 60 watts.
- What may cause a buzzing or hum in the signal of an AC-operated transmitter?
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.
- Power-line voltages have been made standard over the years and the voltages generally
supplied to homes are approximately:
A. 120 and 240 volts.
B. 110 and 220 volts.
C. 100 and 200 volts.
D. 130 and 260 volts.
- So-called "transfomerless" 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 with respect to the chassis.
B. chassis connections are grounded by the center pin of the power source's plug.
C. the load across the power supply is variable.
D. one side of the line cord is connected to the chassis.
- You have a very loud low-frequency hum appearing on your transmission. In what
part of your transmitter would you first look for the trouble?
A. the power supply.
B. the variable-frequency oscillator.
C. the driver circuit.
D. the power amplifier circuit.
- In a regulated power supply, the transformer connects to an external source which is
referred to as ____________.
A. regulator
B. input
C. filter
D. rectifier
- In a regulated power supply, the ___________ is between the input and the rectifier.
A. transformer
B. output
C. regulator
D. filter
- In a regulated power supply, the ____________ is between the transformer and the
filter.
A. rectifier
B. input
C. output
D. regulator
- In a regulated power supply, the output of the rectifier is connected to the _________.
A. filter
B. output
C. transformer
D. regulator
- In a regulated power supply, the output of the filter connects to
the _________.
A. regulator
B. transformer
C. rectifier
D. output
- In a regulated power supply, the __________ is connected to the
regulator.
A. output
B. rectifier
C. input
D. transformer