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ESAT (Data Comms and Networking (3rd Ed.) by Berhouz A. Forouzan) > ESAT Forouzan - Chapter 5: Analog Transmission > Flashcards

ESAT Forouzan - Chapter 5: Analog Transmission Flashcards

1
Q

ASK, PSK, FSK nad QAM are examples of __________ modulation.
a. Digital-to-analog
b. Digital-to-analog
c. Analog-to-analog
d. Analog-to-digital

A

a. Digital-to-analog

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2
Q

AM and FM are examples of ___________ modulation.
a. Digital-to-analog
b. Digital-to-analog
c. Analog-to-analog
d. Analog-to-digital

A

c. Analog-to-analog

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3
Q

In QAM, both phase and ____________ of a carrier frequency are varied.
a. Amplitude
b. Frequency
c. Bit rate
d. Baud rate

A

a. Amplitude

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4
Q

Which of the following is most affected by noise?
a. PSK
b. ASK
c. FSK
d. QAM

A

b. ASK

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5
Q

If the baud rate is 400 for a 4-PSK signal, the bit rate is _________ bps.
a. 100
b. 400
c. 800
d. 1600

A

c. 800

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6
Q

If the bit rate for an ASK signal is 1200 bps, the baud rate is __________.
a. 300
b. 400
c. 600
d. 1200

A

d. 1200

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7
Q

If the bit rate for an FSK signal is 1200 bps, the baud rate is __________.
a. 300
b. 400
c. 600
d. 1200

A

d. 1200

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8
Q

If the bit rate for a QAM signal is 3000 bps and a signal unit is represented by a tribit, what is the baud rate?
a. 300
b. 400
c. 1000
d. 1200

A

c. 1000

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9
Q

If the baud rate for a QAM signal is 3000 and a signal unit is represented by a tribit, what is the bit rate?
a. 300
b. 400
c. 1000
d. 9000

A

d. 9000

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10
Q

If the baud rate for a QAM signal is 1800 and the bit rate is 9000, how many bits are there per signal unit?
a. 3
b. 4
c. 5
d. 6

A

c. 5

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11
Q

In 16-QAM, there are 16 __________.
a. Combination of phase and amplitude
b. Amplitudes
c. Phases
d. Bps

A

a. Combination of phase and amplitude

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12
Q

Which modulation technique involves tribits, eight different phase shifts, and one amplitude?
a. FSK
b. 8-PSK
c. ASK
d. 4-PSK

A

b. 8-PSK

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13
Q

Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?
a. 700 KHz
b. 705 KHz
c. 710 KHz
d. Cannot be determined from given information

A

a. 700 KHz

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14
Q

A modulated signal is formed by ________.
a. Changing the modulating signal by the carrier wave
b. Changing the carrier wave by the modulating signal
c. Quantization of the source data
d. Sampling at the Nyquist frequency

A

b. Changing the carrier wave by the modulating signal

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15
Q

If FCC regulations are followed, the carrier frequencies of adjacent AM radio station are _________ apart.
a. 5 KHz
b. 10 KHz
c. 200 KHz
d. 530 KHz

A

b. 10 KHz

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16
Q

If FCC regulations are followed, ___________ potential FM stations are theoretically possible in a given area.
a. 50
b. 100
c. 133
d. 150

A

a. 50

17
Q

When an ASK signal is decomposed, the result is _____________.
a. Always one sine wave
b. Always two sine waves
c. An infinite number of sine waves
d. None of the above

A

c. An infinite number of sine waves

18
Q

The bandwidth of an FM signal requires 10 times the bandwidth of the __________ signal.
a. Carrier
b. Modulating
c. Bipolar
d. Sampling

A

b. Modulating

19
Q

Modulation of an analog signal can be accomplished through changing the ______ of the carrier signal.
a. Amplitude
b. Frequency
c. Phase
d. Any of the above

A

d. Any of the above

20
Q

For a telephone line, the bandwidth for voice is usually _________ the bandwidth for data.
a. Equivalent to
b. Less than
c. Greater than
d. Twice

A

c. Greater than

21
Q

For a given bit rate, the minimum bandwidth for ASK is ______ the minimum bandwidth for FSK.
a. Equivalent to
b. Less than
c. Greater than
d. Twice

A

b. Less than

22
Q

As the bit rate of an FSK signal increases, the bandwidth ___________.
a. Decreases
b. Increases
c. Remains the same
d. Doubles

A

b. Increases

23
Q

For FSK, as the difference between the two carrier frequencies increases, the bandwidth ________.
a. Decreases
b. Increases
c. Remains the same
d. Halves

A

b. Increases

24
Q

Which ITU-T modems standard uses trellis coding
a. V.32
b. V.33
c. V.34
d. (a) and (b)

A

a. V.32

25
Q

In trellis coding the number of data bits is _________ the number of transmitted bits.
a. Equal to
b. Less than
c. More than
d. Double that of

A

b. Less than

26
Q

What is the object of trellis coding?
a. To narrow the bandwidth
b. To simplify modulation
c. To increases the data rate
d. To reduce the error rate

A

d. To reduce the error rate

27
Q

The bit rate always equal the baud rate in which type of signal?
a. FSK
b. QAM
c. 4-PSK
d. All the above

A

a. FSK

28
Q

A modulator converts a(n) _________ signal to a(n) ____________ signal.
a. Digital; analog
b. Analog; digital
c. PSK; FSK
d. FSK; PSK

A

b. Analog; digital

29
Q

A 56K modem can download at a rate of ___________ Kbps and upload at a rate of ______________ Kbps.
a. 33.6; 33.6
b. 33.6; 56.3
c. 56.6; 33.6
d. 56.6; 56.6

A

c. 56.6; 33.6

ESAT (Data Comms and Networking (3rd Ed.) by Berhouz A. Forouzan) (31 decks)

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