ALLIGATION OR MIXTURE PROBLEMS QUIZ

A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

Statistically independent

Orthogonal

Correlated

Uncorrelated

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In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands first increases, then decreases

Amplitude of distant sidebands increases

Amplitude of distant sidebands remains constant

Amplitude of distant sidebands decreases

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Commercial Frequency deviation of FM is

65 kHz

70 kHz

80 kHz

75 kHz

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For telegraphy the most commonly used modulation system is

FSK

Single tone modulation

PCM

Two tone modulation

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A buffer amplifier is

A double-tuned amplifier

None of these

A high gain D.C. amplifier

A cathode follower stage

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To eliminate ghosts in the picture

Use a longer transmission line

Twist the transmission line

Connect a booster

Change the antenna orientation of location

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In a FM receiver, amplitude limiter

Eliminates any change in amplitude of received FM signals

None of these

Reduces the amplitude of signals

Amplifiers low frequency signals

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SSB can be generated by

Good attenuation characteristics

Phase cancellation method

Filter method

All of these

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PAM stands for

Phase Analogue Modulation

Pulse Amplitude Modulation

Phase Amplitude Modulation

Pulse Analogue Modulation

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A telephone channel requires a bandwidth of about

50 kHz

10 kHz

3 kHz

1 kHz

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