Q. Which one is digital modulation technique?

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Q. Since noise phase modulated FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude

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Q. Consider the following statements as regards DPSK and DEPSK

1. DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time Tb
2. In DPSK, synchronous demodulation recovers the signal b(t) and the decoding of b(t) to generate d(t) is done at base band
3. In both DPSK and DEPSK errors always occur in pairs

Which of the above statements are correct?

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Q. An audio frequency of 5 kHz is translated to a radio frequency carrier of frequency 1 MHz and transmitted it to space through an antenna. The required height of antenna is

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Q. Pre-emphasis circuit is used

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Q. In which frequency range is the noise figure in a transistor minimum

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Q. In commercial FM Broadcasting, A radio station transmitting the signal at 98.3 MHz, it is

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Q. Which of following digital modulation technique?

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Q. A discrete zero memory information source has 40 symbols and each symbol is equally likely. The minimum number of bits required to code the source with uniform length code and entropy of the source are

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Q. The standard intermediate frequency for FM ratio is

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Q. In an end fire array, the radiation pattern

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Q. Armstrong FM transmitter uses

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Q. Which of the following microphones has highest output impedance?

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Q. Consider the following statements about PCM
1. PCM is not noise resistant
2. PCM requires complex encoding and quantizing circuitry
3. PCM requires large bandwidth

Which of the above are correct?

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Q. In a television transmitter, the output stage is most likely to be

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Q. The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is

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Q. The efficiency of a direct radiating cone type loudspeaker is about

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Q. The message carrying efficiency is best in

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Q. An SSB-AM signal cannot be demodulated by

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Q. The pre-emphasis circuit is used

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