NZART Amateur Examination                     page 9          NZARTX07 Security code 264678

  1. Insulators are used at the end of suspended antenna wires to:
    1. increase the effective antenna length
    2. limit the electrical length of the antenna
    3. make the antenna look more attractive
    4. prevent any loss of radio waves by the antenna

  2. At the ends of a half-wave dipole the:
    1. voltage and current are both high
    2. voltage is high and current is low
    3. voltage and current are both low
    4. voltage low and current is high

  3. Because of high absorption levels at frequencies below 4 MHz during daylight hours, only high angle signals are normally reflected back by this layer:
    1. C
    2. D
    3. E
    4. F

  4. Signal fadeouts resulting from an 'ionospheric storm' or 'sudden ionospheric disturbance' are usually attributed to:
    1. heating of the ionised layers
    2. over-use of the signal path
    3. insufficient transmitted power
    4. solar flare activity

  5. The skip distance of radio signals is determined by the:
    1. type of transmitting antenna used
    2. power fed to the final amplifier of the transmitter
    3. only the angle of radiation from the antenna
    4. both the height of the ionosphere and the angle of radiation from the antenna

  6. The position of the E layer in the ionosphere is:
    1. above the F layer
    2. below the F layer
    3. below the D layer
    4. sporadic

  7. Reception of high frequency radio waves beyond 4000 km normally occurs by the:
    1. ground wave
    2. skip wave
    3. surface wave
    4. sky wave
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