Question

QUESTION 1

1. Select the correct statement(s) regarding signals observed in the time and frequency domains,

		a. signals that contain information typically appear as an aperiodic amplitude signal in the time domain, and will have a bandwidth in the frequency domain
		b. signals that appear periodic in the time domain (e.g., sinusoidal) will be associated with asingle frequency in the frequency domain
		c. signals containing greater amounts of information will typically have a larger bandwidth in the frequency domain compared to signals containing less information
		d. all statements are correct

10 points   

QUESTION 2

1. Digital signals representing information in the time domain never have an associated bandwidth in the frequency domain. Therefore digital communications are popular with service providers.

True

False

10 points   

QUESTION 3

1. In the time domain, a carrier wave can be represented by the sinusoidal wave formula: c(t)=A*cos(2πft ± φ). What do the variables in this equation represent?

		a. amplitude, frequency, time, power
		b. peak power, frequency bandwidth, time, signal source
		c. amplitude, frequency, time, phase angle
		d. ASIN, fading, clock cycle, phase

Answer 1

QUESTION 1 :(D) ALL OF THE ABOVE

1. a. signals that contain information typically appears as an aperiodic amplitude signal in the time domain and will have a bandwidth in the frequency domain (TRUE)
2. b. signals that appear periodic in the time domain (e.g., sinusoidal) will be associated with a single frequency in the frequency domain(TRUE)
3. signals containing greater amounts of information will typically have a larger bandwidth in the frequency domain compared to signals containing less information (TRUE)

Hence, all the statements are correct here.

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QUESTION 2: TRUE

• Digital signals will never have the associated bandwidth when it is in the FREQUENCY domain.
• But in the time domain, it has the bandwidth.
• Therefore digital communications are popular with service providers.

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QUESTION 3: OPTION C

c(t)=A*cos(2πft ± φ).

Here,

A = Amplitude

f= frequency

t = time

PHI = Phase angle

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