Q.1
In radio transmission, the medium of transmission is ___________
  • Space
  • An antenna
  • Cable
  • None of the above
Q.2
In a radio receiver, we generally use ___________ oscillator as a local oscillator
  • Crystal
  • Wien-bridge
  • Phase-shift
  • Hartley
Q.3
In an AM wave useful power is carrier by ___________
  • Carrier
  • Sidebands
  • Both sidebands and carrier
  • None of the above
Q.4
When the modulating signal controls the frequency of the carrier, we get___________
  • Phase modulation
  • Amplitude modulation
  • Frequency modulation
  • May be any one of the above
Q.5
In India, ___________ modulation is used for radio transmission
  • Frequency
  • Amplitude
  • Phase
  • None of the above
Q.6
The diode detector in an AM radio receiver is usually found ___________
  • Before the first RF stage
  • After the first RF stage
  • After several stages of amplification
  • None of the above
Q.7
In a radio receiver, noise is generally developed at ___________
  • IF stage
  • Receiving antenna
  • Audio stage
  • RF stage
Q.8
The diode detector in an AM radio receiver is usually found ___________
  • Before the first RF stage
  • After the first RF stage
  • After several stages of amplification
  • None of the above
Q.9
The function of ferrite antenna is to ___________
  • Reduce stray capacitance
  • Stabilise d.c. bias
  • Increase the Q of tuned circuit
  • Reduce noise
Q.10
If Amin =and Amax =what is the percentage of modulation?
  • 20%
  • 40%
  • 50%
  • 10%
Q.11
If Amin =and Amax =what is the percentage of modulation?
  • 20%
  • 40%
  • 50%
  • 10%
Q.12
The signal voltage induced in the aerial of a radio receiver is of the order of ___________
  • mV
  • µV
  • V
  • None of the above
Q.13
The function of ferrite antenna is to ___________
  • Reduce stray capacitance
  • Stabilise d.c. bias
  • Increase the Q of tuned circuit
  • Reduce noise
Q.14
Modulation is done in ___________
  • Transmitter
  • Radio receiver
  • Between transmitter and radio receiver
  • None of the above
Q.15
Modulation refers to a low-frequency signal controlling the ___________
  • Amplitude of the carrier
  • Frequency of the carrier
  • Phase of the carrier
  • May be any of the above
Q.16
As the modulation level is increased, the carrier power ___________
  • Is increased
  • Remains the same
  • Is decreased
  • None of the above
Q.17
In an AM wave, the majority of the power is in ___________
  • Lower sideband
  • Upper sideband
  • Carrier
  • None of the above
Q.18
AkW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
  • 50 kW
  • 5 kW
  • 8 kW
  • 25 kW
Q.19
In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
  • Amplitude
  • Frequency
  • Phase
  • None of the above
Q.20
A high Q tuned circuit will permit an amplifier to have high ___________
  • Fidelity
  • Frequency range
  • Sensitivity
  • Selectivity
0 h : 0 m : 1 s