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- 1. Multiple Choice
In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.
a) True
b) False
- 2. Multiple Choice
What is the line connecting the positive and negative peaks of the carrier waveform called?
a) Peak line
b) Maximum amplitude ceiling
c) Modulation index
d) Envelope
- 3. Multiple Choice
What is the reference line for the modulating signal?
a) Zero line
b) Carrier peak line
c) Modulated peak line
d) Un-modulated peak line
- 4. Multiple Choice
What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?
a) Decay
b) Distortion
c) Amplification
d) Attenuation
- 5. Multiple Choice
What is the effect of distortion?
a) Total information loss
b) Error information
c) Attenuated information
d) Amplified information
- 6. Multiple Choice
What is the circuit used for producing AM called?
a) Modulator
b) Transmitter
c) Receiver
d) Duplexer
- 7. Multiple Choice
The ratio between the modulating signal voltage and the carrier voltage is called?
a) Amplitude modulation
b) Modulation frequency
c) Modulation index
d) Ratio of modulation
- 8. Multiple Choice
What is the modulation index value if Vmax=5.9v and Vmin=1.2v?
a) 0.5
b) 0.662
c) 0.425
d) 0.14
- 9. Multiple Choice
What is the modulating signal voltage if the maximum and the minimum voltages on the wave was observed to be 5.9v and 1.2v respectively?
a) 2.35v
b) 2.12v
c) 1.85v
d) 3.21v
- 10. Multiple Choice
What is the condition for greatest output power at the transmitter without distortion?
a) Modulating signal voltage > Carrier voltage
b) Modulating signal voltage < Carrier voltage
c) Modulating signal voltage = Carrier voltage
d) Modulating signal voltage = 0
- 11. Multiple Choice
What is the maximum frequency deviation allowed in commercial FM broadcasting?
100 KHz
75 KHz
150 KHz
20 KHz
- 12. Multiple Choice
In Frequency Modulation –
Amplitude of the carrier remains same
Frequency of the carrier varies in accordance with the modulating signal
The number of side bands are infinite
Amplitude of the carrier varies in accordance with the modulating signal
- 13. Multiple Choice
What are the five Infinity Stones?
Reality, Time, Soul, Mind, Power
Life, Time, Strength, Body, Brain
Reality, Soul, Brain, Strength, Domination
- 14. Multiple Choice
A 100 MHz carrier is deviated 50 kHz by a 4 kHz signal. The modulation index is _______.
5
8
12.5
20
- 15. Multiple Choice
FM bandwidth can be approximated by:
Armstrong Rule
Bessel's Rule
Carson's Rule
none of these
- 16. Multiple Choice
Which wave has a greater frequency?AB - 17. Multiple Choice
FREQUENCY MODULATION
Changing the frequency to increase energy of a electromagnetic wave
A method of transmitting signals by changing the amplitude of the wave
Changing the volume of a broadcast signal
A method of transmitting signals by changing the frequency of the wave
- 18. Multiple Choice
Which of these is the Time stone?
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