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Communication Systems

Communication Systems
A modem is classified as low speed if data rate handled is

Upto 100 bps
Upto 400 bps
Upto 250 bps
Upto 600 bps

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Communication Systems
In TV systems, equalising pulses are sent during

Serrations
Horizontal retrace
Vertical blanking
Horizontal blanking

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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
1
15
16

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Communication Systems
To eliminate ghosts in the picture

Change the antenna orientation of location
Twist the transmission line
Connect a booster
Use a longer transmission line

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Communication Systems
In Modulation, “carrier” is

Speech voltage to be transmitted
Voltage for which frequency, phase or amplitude is varied
Resultant wave
Voltage with constant frequency, phase or amplitude

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent excessive grid current
Increase the bandwidth
Prevent over modulation
Prevent tuned circuit damping

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MORE MCQ ON Communication Systems

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