QUESTION 1

Select the true statement(s) regarding the OSI Reference Model.

		a. OSI RM consists of four layers
		b. ISO developed the OSI Reference Model to assist in the conceptualization of how protocols and interface standards work together to enable digital communications
		c. The OSI Reference Model is intended for analog communications only
		d. All of the above are true

10 points

QUESTION 2

Which OSI Reference Model Layer is associated with common networks (e.g., Ethernet LANs)?

		a. Layer 1 - Physical
		b. Layer 2 - Data Link
		c. Layer 3 - Network
		d. Layer 4 - Transport

10 points

QUESTION 3

Today, service providers only implement "partial-mesh" networks based upon network availability and reliability requirements.

True

False

10 points

QUESTION 4

There is no difference between an acoustic signal and an electrical signal. Acoustic and electrical signals are used extensively in satellite communications.

True

False

10 points

QUESTION 5

5. What is the purpose of a transducer?

		a. They are used to transform potential energy into power (watts)
		b. Transducers were invented by Michael Faraday, who used these devices to create electric motors
		c. They transform one type of energy into another type of energy (e.g., acoustic signals into electrical signals and visa versa)
		d. None of the above are correct

10 points

QUESTION 6

Only RF signals are considered part of the electromagnetic spectrum. Optical signals consist of photons which behave as a wave and a particle (wave-particle duality), thus optical signals are not considered part of the E-M spectrum.

True

False

10 points

QUESTION 7

Select the correct statement regarding power density.

		a. For an unguided signal, power density decreases as it travels away from the transmitter
		b. For an unguided signal, power density increases as it travels away from the transmitter
		c. For an unguided signal, power density does not change as it travels away from the transmitter
		d. None of the above are correct

10 points

QUESTION 8

RF and Optical signals are both E-M waves. Therefore, you can collect an optical E-M wave using an RF antenna.

True

False

10 points

QUESTION 9

1,000,000 Hz (1E6) is equivalent to:

		a. 1000kHz
		b. 10MHz
		c. 1MHz
		d. 1GHz

10 points

QUESTION 10

When on a ___________ __________ , users pay for, and have exclusive use of, the network path or medium 24/7.

		a. Dedicated Circuit
		b. Switched Circuit
		c. Virtual Circuit
		d. Packet Switched

10 points

QUESTION 11

A telephone is an example of:

		a. Simplex Communications
		b. Half Duplex Communications
		c. Full Duplex Communications
		d Complex Communications

10 points

QUESTION 12

A voice signal that has been converted into an electrical signal is called:

		a. Baseband
		b. Broadband
		c. Passband
		d. Message

10 points

QUESTION 13

A carrier wave has an amplitude of 5 volts, a frequency of 10 kHz, and -1.57 radian phase angle. Select the correct carrier wave equation.

		a. c(t) = 10 cos(2*5*t -1.57)
		b. c(t) = 5 cos(2*10*t + 1.57)
		c. c(t) = 5 cos(2*10E3*t - 1.57)
		d. None of the above are correct

10 points

QUESTION 14

Viewing a signal in the time domain gives you the profile of the signal over time, while viewing the signal in the frequency domain tells you the frequency bandwidth that the signal occupies. Viewing a signal in both domains is important when determining the overall quality of the signal.

True

False

10 points

QUESTION 15

15. Select the correct equation that represents an AM signal.

		a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
		b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
		c. s(t) = Ac cos [2fct + p cos (2fmt)]
		d. c(t) = Ac cos (2fct )

10 points

QUESTION 16

16. Select the correct equation that represents an FM signal.

		a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
		b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
		c. s(t) = Ac cos [2fct + p cos (2fmt)]
		d. c(t) = Ac cos (2fct )

10 points

QUESTION 17

17. Select the correct equation that represents an PM signal.

		a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
		b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
		c. s(t) = Ac cos [2fct + p cos (2fmt)]
		d. c(t) = Ac cos (2fct )

10 points

QUESTION 18

The period of a sinusoidal waveform is T = 1E-3 = 1 x 10^-3 seconds. What is the frequency and wavelength of the waveform?

		a. 1 Hz, 3E8 meters
		b. 1 kHz, 3E5 meters
		c. 1 MHz, 300 meters
		d. 1 GHz, 0.3 meters

10 points

QUESTION 19

19. If the AM Index, , is between 0 and 1, the distortion of the signal will be minimized.

True

False

10 points

QUESTION 20

A voltage controlled oscillator (Vco) is used to convert message amplitudes into carrier frequency changes.

True

False

10 points

QUESTION 21

21. Select the correct statement(s) regarding QAM.

		a. QAM consists of two carriers operating at the same frequency
		b. Using QAM, information is captured on the carrier(s) in the form of amplitude and phase shifts
		c. QAM with M=8 can represent 3 bits per symbol
		d. All of the above are correct

10 points

QUESTION 22

What does the FM Modulation Index, , tell us.

		a. How much the phase of the carrier frequency is allowed to change
		b. What the phase of the message signal is in relation to the carrier frequency
		c. How much the carrier frequency is allowed to deviate from center
		d. All of the above

10 points

QUESTION 23

23. Calculate the data rate for a 1200 baud signal where each symbol can take on one of two levels (M=8)

		a. 2400 bps
		b. 4800 bps
		c. 3600 bps
		d. 9600 kbps

10 points

QUESTION 24

A symbol can take on one of 64 signaling levels. How many bits can be represented by a single symbol?

		a. N=2
		b. N=4
		c. N=6
		d. N=8

10 points

QUESTION 25

Given the following AM signal, determine the carrier wave's amplitude (Ac) and frequency (fc), the message signals frequency (fm), and the modulation index (): s(t) = 3[1 + 0.6cos (2100E3Hz*t)] cos (21E9Hz*t)

		a. Ac=3, fc=100kHz, fm=1GHz, =0.6
		b. Ac=3, fc=1GHz, fm=100kHz, =0.6
		c. Ac=0.5, fc=1GHz, fm=100kHz, =6
		d. Ac=0.5, fc=1GHz, fm=2kHz, =6

10 points

QUESTION 26

Given the following equation for an FM signal, select the correct information below:

s_FM(t) =3cos[(2280khz*t)+3sin(24000Hz*t)], k_VCO=2000(Hz/v)

		a. FM Index, =9, Message Amplitude, Am=3v
		b. FM Index, =3, Message Amplitude, Am=6v
		c. FM Index, =3, Message Amplitude, Am=3v
		d. FM Index, =9, Message Amplitude, Am=6v

10 points

QUESTION 27

Determine your FM bandwidth given the following: FM Index =5, frequency of your message is fm-4000Hz.

		a. 4 kHz
		b. 12 kHz
		c. 24 kHz
		d. 48 kHz

10 points

QUESTION 28

Given the following equation for an PM signal, select the correct information below:

s_PM(t) =3 cos[(2300MHz*t+5cos(24kHz*t)], k_P=0.3

		a. PM Index, p=5, Message Amplitude, Am=16.67v
		b. PM Index, p=6, Message Amplitude, Am=16.67v
		c. PM Index, p=3, Message Amplitude, Am=6v
		d. PM Index, p=6, Message Amplitude, Am=5v

10 points

QUESTION 29

With PM, the message amplitude and frequency are directly related to bandwidth.

True

False

10 points

QUESTION 30

When frequency division multiplexing (FDM) is used, guard channels are NOT required in-between frequency channels.

True

False