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Unit 8 Quiz

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57. Which of the following antennas receive signals in the horizontal plane equality well from all directions?
A. Horizontal Hertz antenna
B. Vertical loop antenna
C. Vertical Yagi antenna
D. A vertical antenna which is a quarter-wavelength long

58. If the length of a Hertz dipole is decreased

A. its resonant frequency will be lowered its distributed inductance will be increased
B. its distributed inductance will be decreased
C. its resonant frequency will be increased
D. its distributed capacitance between the antenna and ground will be increased.
59. A final amplifier of a radio transmitter draws 250 mA of plate current when the plate supply voltage is 1400 volts. If the plate circuit efficiency is 80% and the transmitter is connected …show more content…
Non-resonant
C. Isotropic
D. Whip
75. ______ is an antenna array which is highly directional at right angles to the plane of the array?
A. Broadside array
B. End-fire array
C. Turnstile array
D. Log-periodic array
76. The directivity pattern of an isotropic radiator is
A. a figure-8
B. a sphere
C. a unidirectional cardioid
D. a parabola
77. An isotropic radiator is
A. in the northern hemisphere
B. an antenna high enough in the air
C. an antenna whose directive pattern is substantially incredible
D. a hypothetical, omnidirectional antenna
78. The purpose of stacking elements on an antenna.
A. Sharper directional pattern
B. increased gain
C. Improved bandpass
D. All of these
79. The advantage of using top loading in a shortened HF vertical antenna is
A. lower quality factor
B. greater structural strength
C. higher losses
D. improved radiation efficiency
80. Where are the voltage nodes in a half-wave antenna?
A. At the ends
B. Three-quarters of the way from the feed point toward the end
C. One-half of the way from the feed point toward the end
D. At the feed point
81. A theoretical reference antenna that provides a comparison for antenna measurements.
A. Marconi antenna
B. Isotropic radiator
C. Yagi-Uda

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