3-O-093: Antennas & Waveguides
3-93O1:
How does the gain of a parabolic dish antenna change when the operating frequency is doubled?
Gain increases 6 dB.
Gain does not change.
Gain is multiplied by 0.707.
Gain increases 3 dB.
3-93O2:
What type of antenna or pickup device is used to extract the RADAR signal from the wave guide?
J-hook.
K-hook.
Folded dipole.
Circulator.
3-93O3:
What happens to the beamwidth of an antenna as the gain is increased? The beamwidth:
Decreases as the gain is increased.
Increases geometrically as the gain is increased.
Increases arithmetically as the gain is increased.
Is essentially unaffected by the gain of the antenna.
3-93O4:
A common shipboard RADAR antenna is the:
Slotted array.
Dipole.
Stacked Yagi.
Vertical Marconi.
3-93O5:
Conductance takes place in a waveguide:
Through electromagnetic and electrostatic fields in the walls of the waveguide.
By interelectron delay.
Through electrostatic field reluctance.
In the same manner as a transmission line.
3-93O6:
To couple energy into and out of a waveguide use:
A thin piece of wire as an antenna.
Wide copper sheeting.
An LC circuit.
Capacitive coupling.
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