Q.
The output current of a 60 % Modulated AM generator is 1.5 A. To what value will the current rise, if the generator is additionally modulated by another audio wave of modulation index 0.7 ?
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a
0.64 A
b
1.64 A
c
2.34 A
d
5.32 A
answer is B.
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Detailed Solution
We know that , Pt = Pc1+μ22 ∴ it = ic1+μ22 ⇒ ic = it1+μ22 =1.51+(0.6)22 =1.51.18 Now, when two signals are superimposed, then , effective modulation index μ2 = μ12 + μ22 = (0.6)2 + (0.7)2 = 0.85 So, it = ic1+μ22 = =1.51.181+0.852 = 1.64 A
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