Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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T0A01 Which of the following is a safety hazard of
a 12-volt storage battery?
a. | Touching both terminals with the hands can cause
electrical shock | c. | RF emissions from the
battery | b. | Shorting the terminals can cause burns, fire, or an
explosion | d. | All of these choices are correct |
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2.
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T0A02 What health hazard is presented by electrical
current flowing through the body?
a. | It may cause injury by heating
tissue | c. | It may cause involuntary muscle
contractions | b. | It may disrupt the
electrical functions of cells | d. | All of these choices are
correct |
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3.
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T0A03 In the United States, what is connected to
the green wire in a three wire electrical AC plug?
a. | Neutral | c. | Equipment ground | b. | Hot | d. | The white wire |
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4.
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T0A04 What is the purpose of a fuse in an
electrical circuit?
a. | To prevent power supply ripple from damaging a
circuit | c. | To limit current to prevent
shocks | b. | To interrupt power in case of
overload | d. | All of these choices are correct |
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5.
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T0A05 Why is it unwise to install a 20-ampere fuse
in the place of a 5-ampere fuse?
a. | The larger fuse would be likely to blow because it is
rated for higher current | c. | Excessive current could cause a
fire | b. | The power supply ripple would greatly
increase | d. | All of these choices are correct |
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6.
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T0A06 What is a good way to guard against
electrical shock at your station?
a. | Use three-wire cords and plugs for all AC powered
equipment | c. | Use a circuit protected by a ground-fault
interrupter | b. | Connect all AC
powered station equipment to a common safety ground | d. | All of these
choices are correct |
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7.
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T0A07 Which of these precautions should be taken
when installing devices for lightning protection in a coaxial cable feed line?
a. | Include a parallel bypass switch for each protector so
that it can be switched out of the circuit when
running high
power | c. | Keep the ground wires from each protector separate and
connected to station ground | b. | Include a series
switch in the ground line of each protector to prevent RF overload from inadvertently
damaging the
protector | d. | Mount all of the protectors on a metal plate that is in turn connected to an
external ground rod |
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8.
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T0A08 What safety equipment should always be
included in home-built equipment that is powered from 120V AC power circuits?
a. | A fuse or circuit breaker in series with the AC hot
conductor | c. | An inductor in parallel with the AC power
source | b. | An AC voltmeter across the incoming power
source | d. | A capacitor in series with the AC power
source |
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9.
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T0A09 What should be done to all external ground
rods or earth connections?
a. | Waterproof them with silicone caulk or electrical
tape | c. | Bond them together with heavy wire or conductive
strap | b. | Keep them as far apart as
possible | d. | Tune them for resonance on the lowest frequency of
operation |
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10.
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T0A10 What can happen if a lead-acid storage
battery is charged or discharged too quickly?
a. | The battery could overheat, give off flammable gas, or
explode | c. | The memory effect will reduce the capacity of the
battery | b. | The voltage can become
reversed | d. | All of these choices are correct |
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11.
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TOA11 What kind of hazard might exist in a power
supply when it is turned off and disconnected?
a. | Static electricity could damage the grounding
system | c. | The fuse might blow if you remove the
cover | b. | Circulating currents inside the transformer might cause
damage | d. | You might receive an electric shock from the charge stored in large
capacitors |
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