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TS EAMCET 9-Sep-2020 Shift 2 Solved Paper
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© examsnet.com
Question : 120
Total: 160
The modulation index used in amplitude modulation of a message signal of peak voltage 10 volts is 0.5. By how much the peak voltage of the carrier signal be changed so as to obtain the modulation index of 0 .8, keeping the peak voltage of the message signal same as before.
increase by 7.5 V
reduce by 7.5 V
increase by 12.5 V
reduce by 12.5 V
Validate
Solution:
Initially modulation index,
µ
=
0.5
and message amplitude,
A
m
=
10
V
As,
µ
=
A
m
A
c
⇒
A
c
1
=
A
m
µ
=
10
0.5
=
20
V
When
µ
=
0.8
and
A
m
=
10
V
A
c
2
=
A
m
µ
=
10
0.8
=
12.5
V
Change in carrier amplitude is
∆
A
c
=
A
c
1
−
A
c
2
=
20
−
12.5
=
7.5
V
Thus, carrier frequency is reduced by
7.5
V
.
© examsnet.com
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