HAM Radio 3/hamradioversion3.0examsandprograms1992.iso/exam/nov20/nov5.dat

Text File | 1991-11-20 | 15KB | 364 lines

168C-2.4   A 9-3   Sky-wave propagation can cover|the entire world, ground waves|cover only hundreds of miles
When compared to sky-wave propagation, what is the usual
effective range of ground-wave propagation?
A. Much smaller
B. Much greater
C. The same
D. Dependent on the weather
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169C-3.1   A 9-3   Sky-wave propagation can cover|the entire world, EME signals |pass through the ionosphere
What type of propagation uses radio signals refracted back to
earth by the ionosphere?
A. Sky wave
B. Earth-moon-earth
C. Ground wave
D. Tropospheric
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170C-3.2   B 9-3   Sky-wave propagation can cover the|entire world by the signals being |being refracted by the ionosphere
What is the meaning of the term sky-wave propagation?
A. Signals reflected from the moon
B. Signals refracted by the ionosphere
C. Signals refracted by water-dense cloud formations
D. Signals retransmitted by a repeater
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171C-3.3   D 9-3   Sky-wave propagation using the|ionosphere skip certain areas |and "skip" off the ionosphere
What does the term skip mean?
A. Signals are reflected from the moon
B. Signals are refracted by water-dense cloud formations
C. Signals are retransmitted by repeaters
D. Signals are refracted by the ionosphere
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172C-3.4   A 9-4   Sky-wave propagation using the |ionosphere "skip" certain areas|called skip zones
What is the area of weak signals between the ranges of ground
waves and the first hop called?
A. The skip zone
B. The hysteresis zone
C. The monitor zone
D. The transequatorial zone
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173C-3.5   C 9-4   Sky-wave propagation using the |ionosphere "skip" certain areas|called skip zones
What is the meaning of the term skip zone?
A. An area covered by skip propagation
B. The area where a satellite comes close to the earth, and
   skips off the ionosphere
C. An area that is too far for ground-wave propagation, but
   too close for skip propagation
D. The area in the atmosphere that causes skip propagation
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174C-3.6   D 9-3   Sky-wave propagation can cover the|entire world by the signals being |being refracted by the ionosphere
What type of radio-wave propagation makes it possible for
amateur stations to communicate long distances?
A. Direct-inductive propagation
B. Knife-edge diffraction
C. Ground-wave propagation
D. Sky-wave propagation
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175C-4.1   C 9-3   About a license term
How long is an average sunspot cycle?
A. 2 years
B. 5 years
C. 11 years
D. 17 years
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176C-4.2   D 9-3   Key word Sunspot
What is the term used to describe the long-term variation in the
number of visible sunspots?
A. The 11-year cycle
B. The Solar magnetic flux cycle
C. The hysteresis count
D. The sunspot cycle
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177C-5.1   A 9-3   The more the higher
What affect does the number of sunspots have on the maximum
usable frequency (MUF)?
A. The more sunspots there are the higher the MUF will be
B. The more sunspots there are, the lower the MUF will be
C. The MUF is equal to the square of the number of sunspots
D. The number of sunspots effects the lowest usable frequency
   (LUF) but not the MUF
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178C-5.2   B 9-3   The more the higher
What affect does the number of sunspots have on the ionization
level in the atmosphere?
A. The more sunspots there are, the lower the ionization level
   will be
B. The more sunspots there are, the higher the ionization level
   will be
C. The ionization level of the ionosphere is equal to the square
   root of the number of sunspots
D. The ionization level of the ionosphere is equal to the square
   of the number of sunspots
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179C-6.1   C 9-5   UHF/VHF signals are reflected |by metal and are bent slightly|passing around various objects
Why can a VHF or UHF radio signal that is transmitted toward a
mountain often be received at some distant point in a different
direction?
A. You can never tell what direction a radio wave is traveling in
B. These radio signals are easily bent by the ionosphere
C. These radio signals are easily reflected by objects in their
   path
D. These radio signals are sometimes scattered in the ectosphere
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180C-6.2   C 9-5   UHF/VHF signals are reflected |by metal and are bent slightly|passing around various objects
Why can the direction that a VHF or UHF radio signal is traveling
be changed if there is a tall building in the way?
A. You can never tell what direction a radio wave is traveling in
B. These radio signals are easily bent by the ionosphere
C. These radio signals are easily reflected by objects in their
   path
D. These radio signals are sometimes scattered in the ectosphere
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181D-1.1   B 8-9   Lock the equipment with a |key-operated ON/OFF switch
How can you prevent the use of your amateur station by
unauthorized persons?
A. Install a carrier-operated relay in the main power
   line
B. Install a key-operated "ON/OFF" switch in the main
   power line
C. Post a "Danger - High Voltage" sign in the station
D. Install ac line fuses in the main power line
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182D-1.2   A 8-9   To control the use of your station
What is the purpose of a key-operated "ON/OFF" switch in the
main power line?
A. To prevent the use of your station by unauthorized persons
B. To provide an easy method for the FCC to put your station
   off the air
C. To prevent the power company from inadvertently turning off
   your electricity during an emergency
D. As a safety feature, to kill all power to the station in the
   event of an emergency
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183D-2.1   D 8-9   Antennas and towers should be grounded|or protected at all times to protect  |the equipment from lightning damage
Why should all antenna and rotator cables be grounded when
an amateur station is not in use?
A. To lock the antenna system in one position
B. To avoid radio frequency interference
C. To save electricity
D. To protect the station and building from damage due to
   a nearby lightning strike
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184D-2.2   C 8-9   Antennas and towers should be grounded|or protected at all times and grounded|when not in use to protect the station
How can an antenna system be protected from damage caused
by a nearby lightning strike?
A. Install a balun at the antenna feed point
B. Install an Rf choke in the feed line
C. Ground all antennas when they are not in use
D. Install a line fuse in the antenna wire
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185D-2.3   D 8-9   Disconnect the equipment|from the power lines
How can amateur station equipment be protected from damage
caused by voltage induced in the power lines by a nearby
lightning strike?
A. Use heavy insulation on the wiring
B. Keep the equipment on constantly
C. Disconnect the ground system
D. Disconnect all equipment after use, either by unplugging
   or by using a main disconnect switch
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186D-2.4   B 8-9   All equipment
For proper protection from lightning strikes, what equipment
should be grounded in an amateur station?
A. The power supply primary
B. All station equipment
C. The feed line center conductors
D. The ac power mains
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187D-3.1   A 8-3   NEVER use a gas pipe |as a grounding point!
What is a convenient indoor grounding point for an amateur
station?
A. A metallic cold water pipe
B. PVC plumbing
C. A window screen
D. A natural gas pipe
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188D-3.2   C 8-10  Ground chassis or case
To protect against electrical shock hazards, what should you
connect the chassis of each piece of your equipment to?
A. Insulated shock mounts
B. The antenna
C. A good ground connection
D. A circuit breaker
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189D-3.3   B 8-3   Hard copper or copper-clad steel
What type of material should a driven ground rod be made of?
A. Ceramic of other good insulator
B. Copper or copper-clad steel
C. Iron or steel
D. Fiberglass
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190D-3.4   C 8-3   Eight foot as a minimum,|longer for dry soil
What is the shortest ground rod you should consider installing
for your amateur station RF ground?
A. 4 foot
B. 6 foot
C. 8 foot
D. 10 foot
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191D-4.1   B 8-10  Microwaves cook and the eyes|are easily damaged
What precautions should you take when working with 1270-MHz
waveguide?
A. Make sure that the RF leakage filters are installed at
   both ends of the waveguide
B. Never look into the open end of a waveguide when RF is
   applied
C. Minimize the standing-wave ratio before you test the
   waveguide
D. Never have both ends of the waveguide open at the same
   time when RF is applied
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192D-4.2   A 8-10  Antennas should be |clear of everything
What precautions should you take when you mount a UHF antenna
in a permanent location?
A. Make sure that no one can be near the antenna when you are
   transmitting
B. Make sure that the RF field screens are in place
C. Make sure that the antenna is near the ground to maximize
   directional effect
D. Make sure you connect an RF leakage filter at the antenna
   feed point
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193D-4.3   C 8-10  Do you run your microwave|oven with the door open?
What precautions should you take before removing the shielding
on a UHF power amplifier?
A. Make sure all RF screens are in place at the antenna
B. Make sure the feed line is properly grounded
C. Make sure the amplifier cannot be accidentally energized
D. Make sure that the RF leakage filters are connected
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194D-4.4   A 8-10  To keep the loss down and deliver|the power to the antenna
Why should you use only good-quality, well-constructed coaxial
cable and connectors for a UHF antenna system?
A. To minimize RF leakage
B. To reduce parasitic oscillations
C. To maximize the directional characteristics of your antenna
D. To maximize the standing-wave ratio of the antenna system
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195D-4.5   B 8-10  To avoid being cooked
Why should you be careful to position the antenna of your
220-MHz hand-held transceiver away from your head when you
are transmitting?
A. To take advantage of the directional effect
B. To minimize RF exposure
C. To use your body to reflect the signal, improving the
   directional characteristics of the antenna
D. To minimize static discharges
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196D-4.6   B 8-10  Microwave oven radiation is RF|radiation and produces heating|like an electric space heater
Which of the following types of radiation produce health risks
most like the risks produced by radio frequency radiation?
A. Microwave oven radiation and ultraviolet radiation
B. Microwave oven radiation and radiation from an electric space
   heater
C. Radiation from Uranium or Radium and ultraviolet radiation
D. Sunlight and radiation from an electric space heater
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197D-5.1   D 8-9   A safety interlock is a switch that  |turns off the power if the cabinet is|opened, to reduce the danger of shock
Why is there a switch that turns off the power to a
high-voltage power supply if the cabinet is opened?
A. To prevent RF from escaping from the supply
B. To prevent RF from entering the supply through the
   open cabinet
C. To provide a way to turn the power supply on and off
D. To reduce the danger of electrical shock
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198D-5.2   A 8-9   A safety interlock is a switch that  |turns off the power if the cabinet is|opened, to reduce the danger of shock
What purpose does a safety interlock on an amateur transmitter
serve?
A. It reduces the danger that the operator will come in contact
   with dangerous high voltages when the cabinet is opened while
   the power is on
B. It prevents the transmitter from being turned on accidentally
C. It prevents RF energy from leaking out of the transmitter cabinet
D. It provides a way for the station licensee to ensure that only
   authorized operators can turn the transmitter on
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199D-6.1   D 7-21  Safety belt
What type of safety equipment should you wear when you are working
at the top of an antenna tower?
A. A grounding chain
B. A reflective vest
C. Loose clothing
D. A carefully inspected safety belt
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200D-6.2   D 7-21  Mountain climbers wear safety ropes  |and tower climbers should wear safety|belts to prevent an accidental falls
Why should you wear a safety belt when you are working at the top
of an antenna tower?
A. To provide a way to safely hold your tools so they don't fall
   and injure someone on the ground
B. To maintain a balanced load on the tower while you are working
C. To provide a way to safely bring tools up and down the tower
D. To prevent an accidental fall
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201D-6.3   A 7-21  Higher that electrical lines is OK|but above electrical lines is very|dangerous
For safety purposes, how high should you locate all portions of
your horizontal wire antenna?
A. High enough so that a person cannot touch them from the ground
B. Higher than chest level
C. Above knee level
D. Above electrical lines
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202D-6.4   D 7-21  Head gear
What type of safety equipment should you wear when you are on the
ground assisting someone who is working on an antenna tower?
A. A reflective vest
B. A safety belt
C. A grounding chain
D. A hard hat
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203D-6.5   A 7-21  Tools, parts, etc. tend to fall
Why should you wear a hard hat when you are on the ground
assisting someone who is working on an antenna tower?
A. To avoid injury from tools dropped from the tower
B. To provide an RF shield during antenna testing
C. To avoid injury if the tower should accidentally collapse
D. To avoid injury from walking into tower guy wires
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204D-7-1.1 C 8-17  Standing Wave Ratio meter ie SWR meter
What accessory is used to measure standing wave ratio?
A. An ohm meter
B. An ammeter
C. An SWR meter
D. A current bridge
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205D-7-1.2 D 8-17  An SWR meter measures the impedance |match between the antenna or antenna|tuner and the feedline/transmitter
What instrument is used to indicate the relative impedance
match between a transmitter and antenna?
A. An ammeter
B. An ohmmeter
C. A voltmeter
D. An SWR meter
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206D-7-2.1 B 7-6   One to one is ideal
What does an SWR-meter reading of 1:1 indicate?
A. An antenna designed for use on another frequency band is
   probably connected
B. An optimum impedance match has been attained
C. No power is being transferred to the antenna
D. An SWR meter never indicates 1:1 unless it is defective
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207D-7-2.2 C 7-6   One point five to one is ok
What does an SWR-meter reading of less than 1.5:1 indicate?
A. An unacceptably low reading
B. An unacceptably high reading
C. An acceptable impedance match
D. An antenna gain of 1.5
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208D-7-2.3 D 7-6   Four to one is not good. Some of|the power is not being radiated |by the antenna
What does an SWR-meter reading of 4:1 indicate?
A. An unacceptably low reading
B. An acceptable impedance match
C. An antenna gain of 4
D. An impedance mismatch, which is not acceptable; it
   indicates problems with the antenna system
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209D-7-2.4 C 7-6   Five to one is not good.  A lot of|the power is not being radiated by|the antenna system
What does an SWR-meter reading of 5:1 indicate?
A. The antenna will make a 1O-watt signal as strong
   as a 50-watt signal
B. Maximum power is being delivered to the antenna
C. An unacceptable mismatch is indicated
D. A very desirable impedance match has been attained
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