MICROBES IN AQUATIC ENVIRONMENT QUIZ

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

Upto 250 bps

Upto 600 bps

Upto 400 bps

Upto 100 bps

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FM transmitting and receiving equipment as compared to AM equipment is

Cheaper

Costly

None of these

Almost equally costly

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The disadvantage of FM over AM is that

Large bandwidth is required

High modulating power is needed

Noise is very high for high frequency

High output power is needed

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The main function of a balanced modulator is to

Produce 100% modulation

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

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When the length of antenna is a whole wavelength

The radiation at right angles is maximum

The radiation at right angles is zero

The radiation is zero in all directions

The radiation is maximum in all directions

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An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

113

102.3

80.9

70.2

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To eliminate ghosts in the picture

Connect a booster

Twist the transmission line

Use a longer transmission line

Change the antenna orientation of location

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Which of the following is an indirect way of generating FM?

Varactor diode modulator

Reactance bipolar transistor

Armstrong modulator

Reactance FET modulator

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The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

8 kW

50 kW

0.5 kW

20 kW

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

1000 ohm

300 ohm

500 ohm

100 ohm

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