Frequency Modulation and Phase Modulation Quiz

Frequency Modulation and Phase Modulation Quiz

12th Grade

35 Qs

quiz-placeholder

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Frequency Modulation and Phase Modulation Quiz

Frequency Modulation and Phase Modulation Quiz

Assessment

Quiz

Physics

12th Grade

Easy

Created by

Al Haitham

Used 2+ times

FREE Resource

35 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 4 kHz message signal causes an FM carrier signal to have a frequency deviation of +-20 kHz. What is the MI ? MI = fcd/fm

a. 80

b. 5

c. 0.2

d. 24

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For an FM signal, what does the term frequency deviation mean ?

a. the center frequency plus the modulation percentage .

b. the change in frequency from the center frequency

c. the modulation index times the center frequency

d. the message signal frequency plus or minus the center frequency

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Frequency modulation (FM) and phase modulation (PM) are subcategories of what type of modulation ?

a. amplitude modulation

b. SSB modulation

c. angle modulation

d. double sideband (DSB) modulation

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the term quadrature mean?

a. a frequency difference of 45 kHz

b. a phase difference of 90°

c. shifting the phase of a signal

d. limiting the phase difference to 45°

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In PM, the carrier frequency deviates with changes in what parameter(s) of the message signal ?

a. Modulation Index

b. Frequency only

c. Amplitude only

d. Frequency and Amplitude

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you adjust the amplitude of the VCO-LO oscillator signal ?

a. by turning the NEGATIVE SUPPLY knob on the base unit

b. by turning the potentiometer knob on the MODULATOR

c. by turning the POSITIVE SUPPLY knob on the base unit

d. by turning the potentiometer knob on the VCO-LO circuit block

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the carrier signal suppressed in the output of a balanced modulator ?

a. It is suppressed by the NEGATIVE SUPPLY voltage.

b. It is suppressed by the POSITIVE SUPPLY voltage

c. It is suppressed by the null potentiometer in the message signal input

d. It is suppressed by adjusting the VCO-LO potentiometer

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