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

Related Mcqs:

1. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?

   A. 50 kW
   B. 5 kW
   C. 8 kW
   D. 25 kW

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. Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier 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. In amplitude modulation, bandwidth is ____________ the audio signal frequency?

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

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

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

7. 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

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

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

9. In an AM wave useful power is carrier by ______________?

   A. Carrier
   B. Sidebands
   C. Both sidebands and carrier
   D. None of the above

10. As the modulation level is increased, the carrier power__________________?

    A. Is increased
    B. Remains the same
    C. Is decreased
    D. None of the above