WorksheetsUNIT - 2 QUIZZ
Total questions: 15
Worksheet time: 8mins
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
Wide band FM has the characteristics:
The frequency sensitivity kf is large
Bandwidth is wide
Both a and b
None of the above
Narrow band FM has the characteristics
The frequency sensitivity kf is small
Bandwidth is narrow
Both a and b
None of the above
In frequency modulation,
Armstrong method is used for generation
Multiple side bands are generated
The FM signal has infinite bandwidth
All of the above
The ratio of maximum peak frequency deviation and the maximum modulating signal frequency is termed as
Frequency deviation
Deviation ratio
Signal to noise ratio
Frequency spectrum
Carson's rule is used to calculate
Bandwidth of FM signal
Signal to noise ratio
Modulation index
Noise figure
The increase or decrease in the frequency around the carrier frequency is termed as
Figure factor
Frequency deviation
Modulation index
Frequency Spectrum
Phase-locked loop can be used as
FM demodulator
AM demodulator
FM receiver
AM receiver
VCO is used to generate
Direct FM
Indirect FM
SSB-SC
DSB-SC
According to Carson’s rule, Bandwidth B and modulating frequency fm are related as
B = 2(Δf + fm) Hz
B = fm Hz
B < 2fm Hz
B > 2fm Hz
Armstrong method is used for the generation of
Direct FM
Indirect FM
SSB-SC
DSB-SC
Pre emphasis is done before
Before modulation
Before transmission
Before detection at receiver
After detection at receiver
De emphasis is
is restoring of original signal power
is done at the detector output of the receiver
is the inverse process of Pre emphasis
All of the above
Pre emphasis is done
For boosting of modulating signal voltage
For modulating signals at higher frequencies
In FM before modulation
All of the above
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
