Modulation refers to a low-frequency signal controlling the ________________?

Related Mcqs:

1. In amplitude modulation, bandwidth is ____________ the audio signal frequency?

   A. Thrice
   B. Four times
   C. Twice
   D. None of the above

2. In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?

   A. Amplitude
   B. Frequency
   C. Phase
   D. None of the above

3. If modulation is 100% then signal amplitude is ____________arrier amplitude?

   A. Equal to
   B. Greater than
   C. Less than
   D. None of the above

4. A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?

   A. 3
   B. 6
   C. 5
   D. None of the above

5. When the modulating signal controls the frequency of the carrier, we get______________?

   A. Phase modulation
   B. Amplitude modulation
   C. Frequency modulation
   D. May be any one of the above

6. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?

   A. The difference frequency is closer to oscillator frequency
   B. Lower frequencies are easier to amplify
   C. Only the difference frequency can be modulated
   D. None of the above

7. The signal voltage induced in the aerial of a radio receiver is of the order of ________________?

   A. mV
   B. µV
   C. V
   D. None of the above

8. If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?

   A. Sensitivity
   B. Selectivity
   C. Distortion
   D. Fidelity

9. At 100% modulation, the power in each sideband is _____________ of that of carrier?

   A. 50%
   B. 40%
   C. 60%
   D. 25%

10. If Amin = 40 and Amax = 60, what is the percentage of modulation?

    A. 20 %
    B. 40 %
    C. 50 %
    D. 10 %