### Modulation

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

1. 3
2. 6
3. 5
4. None of the above

6

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

1. 50 kW
2. 5 kW
3. 8 kW
4. 25 kW

50 kW

3. A high Q tuned circuit will permit an amplifier to have high _________…

1. Fidelity
2. Frequency range
3. Sensitivity
4. Selectivity

Selectivity

4. As the modulation level is increased, the carrier power _________

1. Is increased
2. Remains the same
3. Is decreased
4. None of the above

Remains the same

5. At 100% modulation, the power in each sideband is _________ of that of carrier

1. 50%
2. 40%
3. 60%
4. 25%

25%

6. Demodulation is done in _________

1. Receiving antenna
2. Transmitter
4. Transmitting antenna

7. If a radio receiver amplifies all the signal frequencies equally well, it is said to have high _________

1. Sensitivity
2. Selectivity
3. Distortion
4. Fidelity

Fidelity

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

1. 20 %
2. 40 %
3. 50 %
4. 10 %

20 %

9. If level of modulation is increased _________ power is increased

1. Carrier
2. Sideband
3. Carrier as well as sideband
4. None of the above