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Communication Systems

Communication Systems
For telegraphy the most commonly used modulation system is

PCM
Two tone modulation
FSK
Single tone modulation

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Communication Systems
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

3E
4E
6E
2E

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Communication Systems
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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Communication Systems
In EM waves, polarization

Is caused by reflection
Is always vertical in an isotropic medium
Is due to transverse nature of waves
Results from longitudinal nature of waves

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Communication Systems
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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Communication Systems
A buffer amplifier is

A cathode follower stage
A double-tuned amplifier
None of these
A high gain D.C. amplifier

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