1.
FM is disadvantageous over AM signal because
A
much wider channel bandwidth is required
B
FM systems are more complex and costlier
C
Adjacent channel interference is more
D
Both a and b
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FM is disadvantageous over AM signal because
much wider channel bandwidth is required
FM systems are more complex and costlier
Adjacent channel interference is more
Both a and b
Armstrong method is used for the generation of
Direct FM
Indirect FM
SSB-SC
DSB-SC
The bandwidth in ........ depends on the number of significant sidebands.
FCM
QAM
Delta Modulation
Frequency Modulation
What is the effect on the deviation d of an FM signal when it is passed through a mixer?
Doubles
Reduces
Becomes half
Remains unchanged
VCO is used to generate
Direct FM
Indirect FM
SSB-SC
DSB-SC
The modulation index of FM is given by
= frequency deviation/ modulating frequency
= modulating frequency /frequency deviation
= modulating frequency/ carrier frequency
= carrier frequency / modulating frequency
The amount of frequency deviation in FM signal depends on
Amplitude of the modulating signal
Carrier frequency
Modulating frequency
Transmitter amplifier
Phase-locked loop can be used as
FM demodulator
AM demodulator
FM receiver
AM receiver
In Frequency Modulation
Amplitude of the carrier remains same
Frequency of the carrier varies in accordance with the modulating signal
The number of side bands are infinite
All of the above
Frequency deviation in Frequency Modulation is
Change in carrier frequency to the frequency above and below the centre frequency
Formation of side bands
The variation of the instantaneous carrier frequency in proportion to the modulating signal
All of the above