PCE_Formative Assessment No 1 (3042)

If Modulation index is greater than 1

• The baseband signal is not preserved in the envelope of the AM signal

• The recovered signal is distorted

• It is called over modulation

• All of the above

The modulation index in amplitude modulated wave is

• < 1

• > 1

• >= 1

• <= 1

What is the modulation index of an over modulated wave ?

• 1

• > 1

• < 1

• zero

an audio signal of amplitude one fourth the ampltude of carrier wave is used in amplitude modulation what is modulation index

• 0.25

• 1

• 4

• None of the above

An AM signal has a carrier frequency (fc) of 10KHz, the upper sideband is transmitted at 11KHz, the bandwidth required for the AM signal transmit is -------?

• 10KHz

• 2KHz

• 11KHz

• 1KHz

In TV transmission

• AM for picture and FM for sound is employed

• FM for picture and AM for sound is employed

• FM is employed for both picture & sound

• AM is employed for both picture & sound

A carrier is modulated to a depth of 40%, the % increase in the transmitted power is........

• 40%

• 20%

• 8%

• 16%

In TV transmission, picture signal is ............. modulated

• Amplitude

• Frequency

• Phase

• None of the above

A signal with frequency fm modulates a carrier fc (fc>>fm). Then the output of the AM DSB-SC signal will contain frequencies.....?

• 2fc & fc(+/-)fm

• fc & fc(+/-)fm

• fc(+/-)fm

• fc & fc(+/-)2fm

Which of the following requires least bandwidth

• DSB SC

• DSB

• VSB

• SSB