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NEET Questions / Physics / Communication System / Communication Systems
A signal with bandwidth 20 kHz is being transmitted using amplitude modulation. To prevent overlapping of sidebands and allow for efficient filtering at the receiver, what is the minimum required carrier frequency?
10 kHz
20 kHz
40 kHz
80 kHz
A message signal of frequency 10 kHz and peak voltage 10 V is used to modulate a carrier wave of frequency 1 MHz and peak voltage 20 V. If the modulation index is 0.5, what is the peak voltage of the upper sideband?
2.5 V
5 V
10 V
20 V
In amplitude modulation, the message signal is encoded in the ______ of the carrier wave.
Amplitude
Frequency
Phase
Wavelength
A message signal of frequency 10 kHz and peak voltage of 10 V is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 V. What is the modulation index?
0.2
0.5
2.0
1.0
What is the bandwidth of an AM signal if the highest modulating frequency is 5 kHz?
5 kHz
10 kHz
2.5 kHz
20 kHz
Identify the incorrect statement from the following
detectionย is carried out using a rectifier and an envelop detector
Pulse Position denotes the time of rise or fall of the pulse amplitude
Modulation index ฮผ is kept โฅ1, to avoid distortion
Facsimile (FAX) scans the contents of the document to create electronic signals
In amplitude modulation, the bandwidth is
Twice the audio signal frequency
Thrice the audio signal frequency
Thrice the carrier wave frequency
Sum of audio signal frequency and carrier wave frequency
If and are carrier and modulating signals respectively, The modulation index isย
56%
30%
50%
48%
The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is
10%
20%
25%
50%
In an amplitude modulated wave for audio frequency of 500 cycle/second, the appropriate carrier frequency will be
50 cycles/s
100 cycles/s
500 cycles/s
50,000 cycles/s
