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Communication Systems

Communication Systems
For AM receivers the standard IF frequency is

10.7 MHz
1.07 MHz
455 kHz
106 kHz

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Communication Systems
The direction of rotation of a CD is

Clockwise
Mostly anticlockwise but some times clockwise
Clockwise or anticlockwise depending on frequency of data stored
Anticlockwise

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

8
16
15
1

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

The lower modulating power requirement
Better linearity
Improved efficiency
High power output per transistor

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

300 ohm
1000 ohm
100 ohm
500 ohm

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Communication Systems
In EM waves, polarization

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

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