Q. Dynamic range of hi-fi system is at least

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Q. A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

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Q. The seven segment display used in watches and clocks generally uses

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Q. If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then modulating frequency is

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Q. When a signal is quantized such that the step size S is small in comparison with the peak to peak range of the signal, the mean square quantization error is equal to

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Q. Assertion (A): Many times a radar cannot detect 'grounding hopping' military aircraft.

Reason (R): Ground interference limits the range of radar.

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Q. Entropies associated with an extremely unlikely message and that with an extremely likely message are respectively

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Q. For TV broadcast, picture signal is modulated in

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Q. Assertion (A): Stubs, directional couplers and baluns are very commonly used in communication systems

Reason (R): Characteristic impedance of a line is an important parameter.

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Q. Audio frequency range lies between

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Q. Assertion (A): SSB and ISB receivers have good S/N ratio

Reason (R): SSB and ISB receivers have good suppression of adjacent channels.

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Q. De-emphasis circuit is used

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Q. Which is most important subsystem for recovering and reconstructing signal in a TDM system?

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Q. Which one of the following is an indirect way of generating FM?

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Q. Companding is used in PCM to

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Q. Assertion (A): In AM the amplitude of carrier is made proportional to the instantaneous amplitude of modulating wave

Reason (R): In AM, frequency of side band = frequency carrier ± frequency of modulating wave.

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Q. Pressing a key on telephone set generates two frequencies. The basis for selection of these frequencies is

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Q. Which of the following oscillator is not in FM?

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Q. The number of spectral component of impulse wave is

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Q. Assertion (A): If a carrier is modulated by three sine waves and m₁, m₂, m₃ are the modulation indices, the total modulation index mt is
mt = (m₁² + m₂² + m₃²)^0.5

Reason (R): An AM, higher the level of modulation, lower is the audio power required to produce modulation.

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