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Assignment Questions - 14182_274

Neets Module 10-Introduction to Wave Propagation, Transmission Lines, and Antennas
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31 4-66.   The principal disadvantage of the rhombic antenna is its 1.  poor directivity 2.  large antenna site 3.  low antenna voltage 4.  high-frequency inefficiency 4-67.   The unidirectional radiation pattern of the rhombic antenna is caused by which of the following antenna characteristics? 1.  Size 2.  Shape 3.  Termination resistance 4.  Frequency of the input energy 4-68.   Horizontal half-wave antennas mounted at right angles to each other in the same horizontal plane make up which of the following antennas? 1.  Rhombic 2.  Flat-top 3.  Turnstile 4.  Ground-plane 4-69.   The most common means of obtaining a low-radiation angle from a vertical quarter-wave antenna is by what procedure? 1.  Decreasing power 2.  Increasing frequency 3.  Adding a ground plane 4.  Rotating the antenna to a horizontal plane 4-70.   A corner reflector antenna is used for which of the following purposes? 1.  To decrease frequency range 2.  To increase frequency range 3.  To produce a unidirectional pattern 4.  To produce an omnidirectional pattern 4-71.   If a corner-reflector antenna is horizontally polarized, its radiation pattern will take on what shape? 1.  A narrow beam in the horizontal plane 2.  A narrow beam in the vertical plane 3.  A beam similar to a half-wave dipole in the horizontal plane 4.  A beam similar to a half-wave dipole with a reflector in the vertical plane 4-72.   When radio or radar antennas are energized by transmitters, you must not go aloft until which of the following requirements are met? 1.  A safety harness has been issued to you 2.  All transmitters are secured and tagged 3.  A working aloft "chit" has been filled out and signed by proper authority 4.  Each of the above






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