ECIL GET 2017 Recruitment: Electronics (Analog Communication) Quiz 16

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Question 1

What will be the total modulation index if a wave is amplitude modulated by three sine waves with modulation indices of 25%, 50% and 75%?

• AM_t = 1.5
• BM_t = 0.93
• CM_t = 1.22
• DM_t = 1

Question 2

A sinusoidal audio signal is given by It modulates a sinusoidal carrier wave The value of amplitude modulation index must be

• A0.5
• B4
• C0.6
• D0.25

Question 3

Why does an FM radio station perform better than an AM station radiating the same total power?

• AFM is immune to noise.
• BAM has only two sidebands while FM has more
• CFM uses larger bandwidth for large modulation depth
• DCapture effect appears in FM

Question 4

An FM signal has carrier swing of 100 kHz when modulating signal has frequency of 8 kHz. The modulation index is

• A12.5
• B7.5
• C6.25
• D15

Question 5

A carrier wave is phase modulated with frequency deviation of 20 kHz by a single tone frequency of 2 kHz, assuming that phase deviation remains unchanged, bandwidth of the PM signal is

• A20 kHz
• B32 kHz
• C22 kHz
• D44 kHz

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