Amplitude modulation 1

 Amplitude modulation is

• Change in amplitude of the carrier according to modulating signal

• Change in frequency of the carrier according to modulating signal

•  Change in amplitude of the modulating signal according to carrier signal

• Change in amplitude of the carrier according to modulating signal frequency

The AM spectrum consists of

• Carrier frequency

• Upper side band frequency

• Lower side band frequency

• All of the above

The circuit which is used to produce the amplitude modulation is______

• Duplexer

• Modulator

• Amplifier

• Mixer

What is the line connecting the positive and negative peaks of the carrier waveform called?

• Peak line

• Maximum amplitude ceiling

• Envelope

• Modulation index

What is the reference line for the modulating signal?

• Zero line

• Carrier peak line

• Modulated peak line

• Un-modulated peak line

What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?

• Decay

• Distortion

• Amplification

• Attenuation

The ratio between the modulating signal voltage and the carrier voltage is called?

• Amplitude modulation

• Modulation frequency

• Modulation index

• Ratio of modulation

When does over-modulation occur?

• Modulating signal voltage < Carrier voltage

• Modulating signal voltage > Carrier voltage

• Modulating signal voltage = Carrier voltage

• Modulating signal voltage =0

What is the condition for greatest output power at the transmitter without distortion?

• Modulating signal voltage > Carrier voltage

• Modulating signal voltage < Carrier voltage

• Modulating signal voltage = Carrier voltage

• Modulating signal voltage = 0

What is the modulation index value if V_max=5.9v and V_min=1.2v?

• 0.5

• 0.662

• 0.425

• 0.14