1) The ratio between the modulating signal voltage and the carrier voltage is called? a) Amplitude modulation b) Modulation frequency c) Modulation index d) Ratio of modulation 2) What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V? a) 100 b) 91 c) 83.33 d) 0 3) When does over-modulation occur? a) Modulating signal voltage < Carrier voltage b) Modulating signal voltage > Carrier voltage c) Modulating signal voltage = Carrier voltage d) Modulating signal voltage =0 4) What is the modulation index value if Vmax=5.9v and Vmin=1.2v? a) 0.5 b) 0.662 c) 0.425 d) 0.14 5) Which of the following modulating signal voltage would cause over-modulation on a carrier voltage of 10v? a) 9.5 b) 9.99 c) 10 d) 12

AMPLITUDE MODULATION

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