Q.1
In amplitude modulation, bandwidth is ___________ the audio signal frequency
  • Thrice
  • Four times
  • Twice
  • None of the above
Q.2
AV carrier is made to vary betweenV andV by the signal. What is the modulation factor?
  • 3
  • 6
  • 5
  • None of the above
Q.3
In TV transmission, picture signal is ___________ modulated
  • Frequency
  • Phase
  • Amplitude
  • None of the above
Q.4
The superhetrodyne principle provides selectivity at ___________ stage
  • RF
  • IF
  • audio
  • Before RF
Q.5
Most of the amplification in a superhetrodyne receiver occurs at ___________ stage
  • IF
  • RF amplifier
  • Audio amplifier
  • Detector
Q.6
In TV transmission, sound signal is ___________ modulated
  • Amplitude
  • Frequency
  • Phase
  • None of the above
Q.7
Man made noise are ___________ variations.
  • Amplitude
  • Frequency
  • Phase
  • Both phase and frequency
Q.8
If modulation isthen signal amplitude is ___________ carrier amplitude
  • Equal to
  • Greater than
  • Less than
  • None of the above
Q.9
Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude
  • Equal to
  • Greater than
  • Less than
  • None of the above
Q.10
If level of modulation is increased ___________ power is increased
  • Carrier
  • Sideband
  • Carrier as well as sideband
  • None of the above
Q.11
In a transmitter ___________ oscillator is used
  • Hartley
  • RC phase-shift
  • Wien-bridge
  • Crystal
Q.12
Atmodulation, the power in each sideband is ___________ of that of carrier
  • 50%
  • 40%
  • 60%
  • 25%
Q.13
Superhertodyne principle refers to
  • Using a large number of amplifier stages
  • Using a push-pull circuit
  • Obtaining lower fixed intermediate frequency
  • None of the above
Q.14
In the above question, what is the power in sidebands?
  • 8 kW
  • 6 kW
  • 06 kW
  • 9 kW
Q.15
Demodulation is done in ___________
  • Receiving antenna
  • Transmitter
  • Radio receiver
  • Transmitting antenna
Q.16
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because ___________
  • The difference frequency is closer to oscillator frequency
  • Lower frequencies are easier to amplify
  • Only the difference frequency can be modulated
  • None of the above
Q.17
In fiber optics, the signal is _______ waves.
  • light
  • radio
  • infrared
  • very low frequency
Q.18
High data rate digital communication needs to operate on which end of the frequency spectrum?
  • Low end (KHz)
  • High end (GHz)
Q.19
Which data communication method is used to transmit the data over a serial communication link?
  • Simplex
  • Half-duplex
  • Full duplex
  • All of above
Q.20
Which of the following performs modulation and demodulation?
  • fiber optics
  • switch
  • modulator
  • modem
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