BIG HAM STUDY
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DIRECTIONS: FILL IN THE QUESTIONS IN THE HIGHLIGHTED SECTIONS. ONCE COMPLETE, UNHIDE COLUMN C TO SEE ANSWERS. USE "CHARTS" SHEET FOR DIAGRAMS, AND THE "TOTAL" SHEET TO SEE YOUR FINAL PERCENTAGE.ANSWERS
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T0A01
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Which of the following is a safety hazard of a 12-volt storage battery?
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A. Touching both terminals with the hands can cause electrical shock
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B. Shorting the terminals can cause burns, fire, or an explosion
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C. RF emissions from the battery
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D. All of these choices are correct
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T0A02
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What health hazard is presented by electrical current flowing through the body?
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A. It may cause injury by heating tissue
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B. It may disrupt the electrical functions of cells
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C. It may cause involuntary muscle contractions
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D. All of these choices are correct
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T0A03
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In the United States, what is connected to the green wire in a threewire electrical AC plug?
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A. Neutral
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B. Hot
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C. Equipment ground
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D. The white wire
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T0A04
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What is the purpose of a fuse in an electrical circuit?
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A. To prevent power supply ripple from damaging a circuit
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B. To interrupt power in case of overload
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C. To limit current to prevent shocks
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D. All of these choices are correct
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T0A05
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Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
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A. The larger fuse would be likely to blow because it is rated for higher current
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B. The power supply ripple would greatly increase
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C. Excessive current could cause a fire
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D. All of these choices are correct
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T0A06
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What is a good way to guard against electrical shock at your station?
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A. Use three-wire cords and plugs for all AC powered equipment
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B. Connect all AC powered station equipment to a common safety ground
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C. Use a circuit protected by a ground-fault interrupter
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D. All of these choices are correct
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T0A07
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Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line?
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A. Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running high power
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B. Include a series switch in the ground line of each protector to prevent RF overload from inadvertently damaging the protector
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C. Keep the ground wires from each protector separate and connected to station ground
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D. Mount all of the protectors on a metal plate that is in turn connected to an external ground rod
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T0A08
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What safety equipment should always be included in home-built equipment that is powered from 120V AC power circuits?
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A. A fuse or circuit breaker in series with the AC hot conductor
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B. An AC voltmeter across the incoming power source
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C. An inductor in parallel with the AC power source
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D. A capacitor in series with the AC power source
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T0A09
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What should be done to all external ground rods or earth connections?
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A. Waterproof them with silicone caulk or electrical tape
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B. Keep them as far apart as possible
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C. Bond them together with heavy wire or conductive strap
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D. Tune them for resonance on the lowest frequency of operation
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T0A10
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What can happen if a lead-acid storage battery is charged or discharged too quickly?
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A. The battery could overheat, give off flammable gas, or explode
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B. The voltage can become reversed
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C. The memory effect will reduce the capacity of the battery
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D. All of these choices are correct
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T0A11
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What kind of hazard might exist in a power supply when it is turned off and disconnected?
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A. Static electricity could damage the grounding system
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B. Circulating currents inside the transformer might cause damage
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C. The fuse might blow if you remove the cover
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D. You might receive an electric shock from the charge stored in large capacitors
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T0B01
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When should members of a tower work team wear a hard hat and safety glasses?
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A. At all times except when climbing the tower
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B. At all times except when belted firmly to the tower
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C. At all times when any work is being done on the tower
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D. Only when the tower exceeds 30 feet in height
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T0B02
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What is a good precaution to observe before climbing an antenna tower?
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A. Make sure that you wear a grounded wrist strap
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B. Remove all tower grounding connections
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C. Put on a carefully inspected climbing harness(fall arresterand safety glasses
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D. All of these choices are correct
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T0B03
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Under what circumstances is it safe to climb a tower without a helper or observer?
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A. When no electrical work is being performed
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B. When no mechanical work is being performed
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C. When the work being done is not more than 20 feet above the ground
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D. Never
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T0B04
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