Q. A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 10⁶ Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 10⁹ Hz. The bandwidth of the output would be

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Q. In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.

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Q. For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will

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Q. The video heads, in VCR, feed the other circuit

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Q. A high pulse repetition frequency in a radar

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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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