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Exam Questions Papers - Engineering

Q1:

The antenna current of an AM broad cast transmitter, modulated to a depth of 40% by an audio sine wave is 11 amperes. It increased to 12 ampere as a result of simultaneous modulation by another sine wave. The modulation index due to this second sine wave is :

A 0.4

B 0.757

C 0.643

D 0.8

ANS:C - 0.643

μ2 = 0.57057, μ12 + 0.16 = 0.57057 ⇒ μ1 = 0.64 .