TN211_FINAL TERM QUIZ

True or false. In FM, the carrier amplitude remains constant with modulation.

• True

• False

• Not sure

True or false. In FM, the carrier amplitude remains constant with modulation.

• deviation

• shift keying

• DSB

A balanced modulator eliminates which of the following from its output?

• Upper sideband

• Lower sideband

• Carrier

The output signal of a balanced modulator is.

• AM

• SSB

• DSB

The amount of frequency shift during modulation is called the _____

• deviation

• shift keying

• DSB

The acronym VCO means _____.

• voltage-carrier oscillator

• voltage-controlled oscillator

• voltage-controlled octopart

The time constant of a pre-emphasis circuit is ___s.

• 85

• 75

• 65

The biggest disadvantage of FM is its excessive use of _____.

• noise

• spectrum space

• dispersion

If the maximum allowed deviation is 5 kHz but the actual deviation is 3.75 kHz, the percentage of modulation is _____ percent.

• 74

• 60

• 75

A PM signal has a deviation ratio of 3. The maximum modulating signal is 5 kHz. The bandwidth of the signal is _____kHz

• 74

• 60

• 75