Q. In PCM, the biggest disadvantage as compared to AM is

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Q. Which of the following microphones is the cheapest?

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Q. If a line is terminated in characteristic impedance Z₀, the input impedance measured at the input will be

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Q. In a TV, the output from RF tuner is about

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Q. 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

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Q. A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is

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Q. Generally a VCR has

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Q. An antenna has a resistance of 50 Ω and an equivalent noise resistance of 30 Ω The noise figure in decibels is

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Q. An MTI radar operating at 5 GHz has a PRF of 800 pps. The lowest blind speed is

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Q. For maximum output the width of air gap of audio head should be

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Q. The simplest mixer circuit for public address system uses

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Q. PAM stands for

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Q. A Discone antenna is

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Q. In a two tone AM system the two modulating frequencies are 2000 π and 4000 π rad/sec. If carrier frequency is 2π x 10⁶ rad/sec the frequencies of upper sidebands are

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Q. For a system to be designated as hi-fi, the signal to noise ratio should be at least

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Q. Dolby system of noise reduction divides the total audio spectrum into

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Q. In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about

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Q. A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is

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Q. An FM wave is made to pass through a frequency tripler. If original modulation index is mf, the output of tripler has a modulation index equal to

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Q. A balun provides an impedance transformation of

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