COMMUNICATION SYSTEMS QUIZ

A telephone channel requires a bandwidth of about

10 kHz

3 kHz

1 kHz

50 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

A cordless telephone using separate frequencies for transmission in base and portable units is known as

Half duplex arrangement

Either A or B

Duplex arrangement

Neither A nor B

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YOUR ANSWER : ?

A woofer should be fed from the input through a

Band pass filter

High pass filter

Low pass filter

Band stop filter

TRUE ANSWER : ?
YOUR ANSWER : ?

Skip distance depends on time of day and angle of incidence.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.8

1

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

If output power of a radio receiver is doubled, its volume is increased by __________ dB.

-3

2

3

1

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

2E

3E

6E

4E

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YOUR ANSWER : ?

The main function of a balanced modulator is to

Produce balanced modulation of a carrier wave

Limit noise picked by a receiver

Suppress carrier signal in order to create a single-sideband or double sideband

Produce 100% modulation

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YOUR ANSWER : ?

When the length of antenna is a whole wavelength

The radiation is maximum in all directions

The radiation is zero in all directions

The radiation at right angles is zero

The radiation at right angles is maximum

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VSB modulation is preferred in TV because

It reduces the bandwidth requirement to half

It results in better reception

None of these

It avoids phase distortion at low frequencies

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YOUR ANSWER : ?

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