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- 1. Multiple Choice
Modulation is done in
radio receiver
transmitter
between transmitter and receiver
None of the above
- 2. Multiple Choice
In an AM wave the majority of the power is in
lower sideband
Carrier
Upper Sideband
None of the above
- 3. Multiple Choice
Modulation refers to a low frequency signal controlling the
amplitude of the carrier
frequency of the carrier
phase of the carrier
any of the above
- 4. Multiple Choice
Noises are variations in
amplitude
frequency
phase
both phase and frequency
- 5. Multiple Choice
If level of modulation is increased ................ power is increased.
carrier
carrier as well as sideband
sideband
None of the above
- 6. Multiple Choice
At 100% modulation the power in each sideband is ............ of that of carrier.
50%
40%
60%
25%
- 7. Multiple Choice
Overmodulation results in
weakening of the signal
excessive carrier power
distortion
none of the above
- 8. Multiple Choice
The major advantage of FM over AM is
reception is less noisy
higher carrier frequency
smaller bandwidth
small frequency deviation
- 9. Multiple Choice
Which are the additional stages in FM receiver
AF amplifier
limiter
descriminator
selector
None of the above
- 10. Multiple Choice
The antenna length is smaller for FM broadcasting because the wavelength of FM is short
True
False
- 11. Multiple Choice
For FM the value of modulation index can be greater than 1
True
False
- 12. Multiple Choice
AM wave contains three frequencies
True
False
- 13. Fill in the Blank
The process of recovering the audio signal from the modulated wave is known as ...............
- 14. Multiple Choice
In FM the amplitude of the wave is
remains same as carrier
reduces
increases
none of the above
- 15. Multiple Choice
The bandwidth of AM wave is ....... times signal frequency
0
2
1
4
None of the above
- 16. Multiple Choice
The maximum peak to peak voltage of an AM wave is 16 mV while the minimum peak to peak voltage is 8 mV. Find the percent modulation
33.33%
55%
60%
66%
- 17. Multiple Choice
An AM transmitter supplies 10 kW to the antenna when unmodulated. Determine the total power radiated by the transmitter when modulated to 30%
11%
10.45%
9.5%
12.45%
- 18. Multiple Choice
The r.m.s antenna current of an AM transmitter increases by 15 % over the unmodulated value when sinusoidal modulation is applied. What is the modulation index
0.7
0.5
0.8
1
- 19. Multiple Choice
The r.m.s value of carrier voltage is 100 V. After amplitude modulation by an audio signal, r.m.s value becomes 110.Calculate the modulation index
64.8%
68.4%
66.45%
60%
- 20. Multiple Choice
A certain AM transmitter radiates 8kW with carrier unmodulated and 9kW when the carrier is modulated. Find the percentage modulation
25%
60%
50%
0.5%
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