Communication systems

Which of the following identifies the primary function of a radio station tower in a communication system?

• transmitter

• encoder

• decoder

• receiver

information and data that are sent over copper or metal wires using electricity.

• encode

• transmit

• decode

• electrical signals

information and data that are sent over glass or plastic cables using light.

• fiber optic signals

• electromagnetic signals

• laser

• fiber optic cable

Signals that travel through the air without wires. Cell phones use electromagnetic signals to send information.

• fiber optic signals

• electromagnetic signals

• laser

• fiber optic cable

The output transducer of the communication system converts the radio signal into

• Sound

• Mechanical energy

• Kinetic energy

• None of the above

The signal is affected by noise in communication system

• At the transmitter

• At the modulator

• In the channel

• At the receiver

The variation of frequency of carrier wave with respect to the amplitude of the modulating signal

• Amplitude modulation

• Frequency modulation

• Phase modulation

• Pulse width modulation

The internationally accepted frequency deviation for the purpose of FM broadcasts

• 75kHz

• 68kHz

• 80kHz

• 70kHz

The frequency range of 3 MHz to 30 MHz is used for

• Ground wave propagation

• Space wave propagation

• Sky wave propagation

• Satellite communication

What are the only two numbers you can use in binary?

• 0 and 1
• 1 and 2
• 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• 1, 2, 4, 8, 16

Tags

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