WorksheetsComm.Theory & Systems IA1 Revision
Total questions: 5
Worksheet time: 3mins
Name
Class
Date
1.
What is the bandwidth occupied by the TV picture signal?
a)
6.75 MHz
b)
11 MHz
c)
5.55 MHz
d)
10 MHz
2.
What type of filter is used in square law detector?
a)
LPF
b)
HPF
c)
BPF
d)
BEF
3.
Calculate the total modulation index, if a carrier is modulated by two sine waves having modulation indices of 0.4 and 0.3.
a)
0.5
b)
1
c)
0.05
d)
5
4.
Calculate the peak amplitude of the lower sideband, if Em=10V and Ec = 20V.
a)
5V
b)
10V
c)
50V
d)
1V
5.
In a balanced modulator for DSB‑SC generation, Identify the primary purpose of the tuned load circuit at the output.
a)
To select the sum and difference sidebands only
b)
To convert the signal from analog to digital form
c)
To amplify the carrier frequency component strongly
d)
To suppress the message and pass only the carrier
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