Transmission Questions

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51.

If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?

A

300

B

400

C

1000

D

1200

Correct Answer: C

None.

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52.

If the baud rate for a 64-QAM signal is 2000, what is the bit rate?

A

300

B

400

C

1000

D

12000

Correct Answer: D

None.

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53.

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

Correct Answer: A

None.

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54.

. _______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.

A

Digital-to-analog

B

Analog-to-analog

C

Analog-to-digital

D

Digital-to-digital

Correct Answer: A

None.

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55.

Which of the following is not a digital-to-analog conversion?

A

ASK

B

PSK

C

FSK

D

AM

Correct Answer: D

None.

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56.

In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.

A

ASK

B

PSK

C

FSK

D

QAM

Correct Answer: A

None.

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57.

In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.

A

ASK

B

PSK

C

FSK

D

QAM

Correct Answer: C

None.

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58.

In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.

A

ASK

B

PSK

C

FSK

D

QAM

Correct Answer: B

None.

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59.

A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature).

A

amplitude and phase

B

amplitude and frequency

C

frequency and phase

D

none of the above

Correct Answer: A

None.

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60.

Quadrature amplitude modulation (QAM) is a combination of ___________

A

ASK and FSK

B

ASK and PSK

C

PSK and FSK

D

none of the above

Correct Answer: B

None.

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