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Electronics Engineering Objective Questions { Antenna }



8. Antennas commonly used for microwave links are
A. loop antennas
B. log-periodic antennas
C. paraboloidal dishes
D. rhombic antennas
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9. Lens antennas used for microwaves are usually made of
A. polystyrene
B. glass of low refractive index
C. paraboloid surfaces
D. dielectric media having large refractive index
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10. The radiation field of an antenna varies as
A.7.2
B. ?r
C.1
D. None of the above
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11. A parabolic antenna is commonly used at
A. 500 kHz
B. 50 MHz
C. 5000 MHz
D. 50 Hz
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12. A loop antenna is commonly used for
A. radar
B. direction finding
C. satellite communication
D. aeronautical Engg.
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13. Which one of the following is a low-gain but omnidirectional antenna?
A. discone
B. log-periodic
C. loop
D. helical
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14. Which one of the following is not a wide-band antenna?
A. Marconi
B. hehcal
C. rhombic
D. folded dipole
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