Communications - General Questions

Directions to Solve

Communications - General Questions

1.

If a 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the upper-side frequency is ________ kHz.

A.	1005
B.	1000
C.	995
D.	none of the above

Answer: Option A

Explanation:

No answer description available for this question.

2.

A phase-locked loop (PLL) is a feedback circuit consisting of a

A.	phase detector.
B.	low-pass filter.
C.	VCO.
D.	all of the above

Answer: Option D

Explanation:

No answer description available for this question.

3.

What does VCO stand for?

A.	Visually-Controlled Organization
B.	Voltage-Controlled Oscillator
C.	Voltage-Centered Oscilloscope

Answer: Option B

Explanation:

No answer description available for this question.

4.

Amplitude modulation is a ________ process.

A.	multiplication
B.	division
C.	sum/difference

Answer: Option A

Explanation:

No answer description available for this question.

5.

The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency.

A.	balanced
B.	standard amplitude
C.	none of the above

Answer: Option B

Explanation:

No answer description available for this question.

6.

For a four-quadrant linear multiplier, what is the output voltage, given input voltages of V_x = +2 V and V_y = –10 V?

A.	+2 V
B.	+1 V
C.	–2 V
D.	–1 V

Answer: Option C

Explanation:

No answer description available for this question.

7.

In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?

A.	amplitude
B.	frequency
C.	pulse width
D.	phase

Answer: Option A

Explanation:

No answer description available for this question.

8.

Light may be propagated along a fiber-optic cable in which of the following modes?

A.	multimode step index
B.	single-mode step index
C.	multimode graded index
D.	all of the above

Answer: Option D

Explanation:

No answer description available for this question.

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