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

Frequency Modulation and Phase Modulation Quiz

Quiz
•
Physics
•
12th Grade
•
Easy
Al Haitham
Used 2+ times
FREE Resource
35 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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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