Transmission Questions

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61.

________ uses two carriers, one in-phase and the other quadrature

A

ASK

B

PSK

C

FSK

D

QAM

Correct Answer: D

None.

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62.

________ conversion is the representation of analog information by an analog signal.

A

Digital-to-analog

B

Analog-to-analog

C

Analog-to-digital

D

Digital-to-digital

Correct Answer: B

None.

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63.

Analog-to-analog conversion is needed if the available bandwidth is _______

A

low-pass

B

band-pass

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: B

None.

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64.

. Which of the following is not an analog-to-analog conversion?

A

AM

B

PM

C

FM

D

QAM

Correct Answer: D

None.

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65.

In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.

A

AM

B

PM

C

FM

D

none of the above

Correct Answer: A

None.

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66.

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

A

AM

B

PM

C

FM

D

none of the above

Correct Answer: C

None.

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67.

In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.

A

AM

B

PM

C

FM

D

none of the above

Correct Answer: B

None.

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68.

In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency

A

PSK

B

OOK

C

FSK

D

none of the above

Correct Answer: B

None.

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69.

How many carrier frequencies are used in BASK?

A

2

B

1

D

none of the above

Correct Answer: B

None.

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70.

How many carrier frequencies are used in BFSK?

A

2

B

1

D

none of the above

Correct Answer: A

None.

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