Q. In a low level AM system, the modulated amplifiers stage must be

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Q. Entropy gives

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Q. Quantization noise occurs in

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Q. AC hum is picked up from power cables

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Q. PIL tube means

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Q. In an SSB transmitter one is most likely to find

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Q. The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly

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Q. In digital TV digital imaging standard comprises

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Q. The 2 out of 5 code has

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Q. Consider the following statements as regards BPSK and QPSK:

1. In BPSK we deal individually with each bit of duration Tb
2. In QPSK we lump two bits to form a symbol
3. In both BPSK and QPSK signal changes occur at bit rate
4. In QPSK the symbol can have any one of four possible values

Which of the above statements are correct?

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Q. In equally tampered musical scale, an octave is divided into

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Q. If the target cross-section is changing, the best scanning system for accurate tracking is

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Q. If e = 10 sin(10⁸ t + 3 sin 10³ t) then the modulation index is

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Q. Frequency modulation consists in

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Q. Pulse modulation is often used in

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Q. Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of

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Q. A telephone channel requires a bandwidth of about

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Q. For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

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Q. As per Shannon-Hartley theorem, a noise less Gaussian channel has

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Q. DVD uses

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