ECE :: Communication Systems
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Which of the following antennas is circularly polarized?
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A transmitter power of 5 W is increased by 20 dB. The effective radiated power is
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The percentage saving in power of 100% modulated suppressed carrier AM signal is
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The maximum distance between television transmission and receiving antennas for reasonably good reception should be
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Assertion (A): EM waves are attenuated as they travel outward from a source
Reason (R): Both field intensity and power density follow inverse square law.
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The frequency response of a microphone means
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Graphic equaliser system in stereophonic systems generally have
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An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10-23 J/K)
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Some sources of TV programs are
- TV camera
- Telecine
- VTR
- External signal
Whatsapp
Facebook
or P = 500 W.
if carrier is suppressed then
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A.
bandwidth of frequencies having output with in ± 1 dB of the output at 1000 Hz
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B.
bandwidth of frequencies having output with in ± 3 dB of the output at 1000 Hz
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C.
bandwidth of frequencies having output with in ± 1 dB of the output at 500 Hz
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D.
bandwidth of frequencies having output with in ± 3 dB of the output at 500 Hz
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