NEW
Font size
WorksheetsPCE_Formative Assessment No 1 (3042)
Total questions: 20
Worksheet time: 10mins
If Modulation index is greater than 1
The baseband signal is not preserved in the envelope of the AM signal
The recovered signal is distorted
It is called over modulation
All of the above
The modulation index in amplitude modulated wave is
< 1
> 1
>= 1
<= 1
What is the modulation index of an over modulated wave ?
1
> 1
< 1
zero
an audio signal of amplitude one fourth the ampltude of carrier wave is used in amplitude modulation what is modulation index
0.25
1
4
None of the above
An AM signal has a carrier frequency (fc) of 10KHz, the upper sideband is transmitted at 11KHz, the bandwidth required for the AM signal transmit is -------?
10KHz
2KHz
11KHz
1KHz
In TV transmission
AM for picture and FM for sound is employed
FM for picture and AM for sound is employed
FM is employed for both picture & sound
AM is employed for both picture & sound
A carrier is modulated to a depth of 40%, the % increase in the transmitted power is........
40%
20%
8%
16%
In TV transmission, picture signal is ............. modulated
Amplitude
Frequency
Phase
None of the above
A signal with frequency fm modulates a carrier fc (fc>>fm). Then the output of the AM DSB-SC signal will contain frequencies.....?
2fc & fc(+/-)fm
fc & fc(+/-)fm
fc(+/-)fm
fc & fc(+/-)2fm
Which of the following requires least bandwidth
DSB SC
DSB
VSB
SSB
Which of the following analog modulation scheme requires the minimum transmitted power
DSB SC
SSB
VSB
DSB
Choose the incorrect statement regarding FM.....
It has large number of side bands
Modulation index is always less than 1
Bandwidth is always greater than that of AM
None of the above
An FM signal has a frequency deviation of 20KHz & bandwidth of 60KHz. The frequency of the modulating signal will be....?
5KHz
10KHz
20KHz
30KHz
In FM when the modulation index increases, the transmitted power is
Increased
Decreased
Unchanged
None of the above
What is the modulation index in an FM signal with fm=500Hz & frequency deviation of 10KHz
10
20
25
50
In frequency modulation
frequency of the carrier remains constant
frequency of the carrier varies in accordance with the modulating signal amplitude
frequency of the carrier varies in accordance with the modulated signal amplitude
None of the above
Which of the following is not an advantage of FM
Less interference & noise
Adjacent FM channels are separated by guard bands
More convenient receiver & transmitter
None of the above
The process of super imposing information on to a carrier wave is called.......
Communication
Transmission
Modulation
Demodulation
Modulation is done in
Transmitter
Receiver
Between transmitter & Receiver
None of the above
In AM bandwidth is ............ the audio signal frequency.
Thrice
Twice
Four times
None of the above
