Frequency Modulation Quizz 1

The man behind the invention of frequency modulation is

• Edwin Howard Armstrong

• John Chowning

• Reginald Fessenden

• None of the above

Modulation index in frequency modulation can be determined by using

• δf / fm

• Am/fm

• Am/Ac

• Ac/fm

Noise immunity is superior in

• Amplitude Modulation

• Frequency Modulation

• Phase Modulation

• None of the above

In FM signals the amount of frequency deviated is dependent upon

• Modulating frequency

• Carrier frequency

• Amplitude

• Phase

Carson’s rule formula for bandwidth calculation is

• fm

• 2fm (β+1)

• 2 fm

• 2(Δf+fm)

The Δf in the Carson’s rule stands for

• Peak deviation in frequency

• Required bandwidth

• Highest frequency

• Modulating frequency

Parameters constant in FM are

• Amplitude

• Phase

• Frequency

• Both a and b

FM broadcast requires ____________ max. Bandwidth for commercial uses.

• 100 KHz

• 200 KHz

• 300 KHz

• 400 KHz

The purpose of Guard bands in FM is to

• Prevent adjacent channel interference

• Increase bandwidth

• Increase noise

• Both b and c

Crystal controlled oscillator used in FM generation is to provide

• Frequency deviation

• Increase bandwidth

• Increase noise

• Frequency stability