Q. A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?

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Q. The input to a coherent detector is DSB - SC signal plus noise. The noise at the detector output is

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Q. All of the output pulses are at full transmitter power for a strong signal in all of the following except

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Q. LCD uses

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Q. Which of the following stage is not present in AM receiver as compared to FM receiver?

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Q. The function of duplexer in a RADAR is

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Q. If e = 10 cos (2π x 10⁸t + 20 cos 2π 10³t). The bandwidth is

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Q. In FM, as the modulating frequency decreases and the modulating voltage amplitude

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Q. A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is

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Q. The spectrum of the white noise and an impulse function is similar in following aspects

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Q. In a telephone system, the grade of service means

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Q. A longwave AM broadcast transmitter needs

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Q. AGC voltage is applied to the stages which are

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Q. The modulation index of a narrowband FM signal is

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Q. Which is a digital coding technique?

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Q. Which of the following noise sources is different from others?

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Q. For the transmission of normal speech, the PCM channel needs a bandwidth of __________ kHz.

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Q. How much is contributed by each bit in the code word of a PCM system under uniform and symmetric quantization to the signal to noise ratio?

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Q. Noise which assumes great importance at high frequencies is

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Q. Which one is Analog Continuous modulation technique?

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