DCCN-Chapt-2 - Quiz

What is the key difference between analog and digital data?

• Digital data is always periodic

• Analog data is stored as 0s and 1s
• Digital data cannot be transmitted over a medium
• Analog data is continuous, while digital data has discrete states

What is true for a sine wave signal?

• A combination of different frequencies
• A simple periodic analog signal that cannot be decomposed further
• A signal that is always digital
• A non-periodic analog signal

How is frequency defined in relation to period?

• Frequency is the inverse of period
• Frequency and period are independent of each other
• Period is the square of frequency
• Frequency is always greater than period

What is the unit of frequency in the SI system?

• Hertz

• Volt

• Newton
• Ohm

How is phase measured in signal analysis?

• In meters or centimeters

• In hertz or seconds
• In volts or amperes
• In degrees or radians

What happens when a signal does not change at all over time?

• It has zero frequency

• It has an infinite frequency

• It has a frequency of 1 Hz
• It does not exist as a signal

What does a frequency-domain plot primarily show?

• Changes in signal amplitude over time
• Relationship between amplitude and frequency
• Relationship between phase and period
• The number of data packets in transmission

What is wavelength dependent on?

• Only the signal frequency
• Only the propagation speed of the medium
• Both the frequency and propagation speed of the medium
• The amplitude of the signal

How is the propagation speed of electromagnetic signals affected?

• It decreases in air and further decreases in cables

• It remains constant in all mediums

• It increases in optical fiber
• It does not depend on the medium

What type of signal is made up of multiple sine waves with different frequencies, amplitudes, and phases?

• Digital Signal
• Composite Signal
• Analog Signal
• Modulated Signal