Quiz CH4

Choose the best definition of Signals

• Waves used for transmission purpose

• Electrical or EMT representation of data

• Electronically carry data for transmission

____ data analog signal are one type of transmission data vs. signals that could enhance the transmission efficiency.

Digital data ____ signal are type of data vs signals that use line coding as medium of transmission

Below are the advantages of using digital modulation EXCEPT

• Digital modulation has better immunity to noise.

• Digital modulation has a more secure signal transmission.

• Digital modulation requires larger transmission bandwidth.

• Digital modulation has higher efficiency in multiplexing several signals.

What is this process called?

A signal of 1200 bits are transmitted within a minute of time period. Determine its bit rate.

• 1200 bps

• 20 bps

• 200 bps

• 100 bps

____ varies the width of pulse proportional to the amplitude of the signal.

• PPM

• PWM

• PCM

• PAM

___ follows the amplitude of original signal at a constant width.

• PCM

• PWM

• PAM

• PPM

___ sampled a signal and sent in pulse form with a series number or digits.

• PPM

• PAM

• PWM

• PCM

An analog signal is sampled at 100 000 sampling rate every 2 second. What is the baseband signal frequency if redundant are not occured?

• 100 kHz

• 50 kHz

• 25 kHz

• 500 kHz