EC8394 - MCQ TEST I

In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.

• True

• False

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

• Peak line

• Maximum amplitude ceiling

• Modulation index

• Envelope

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

What is the effect of distortion?

• Total information loss

• Error information

• Attenuated information

• Amplified information

What is the circuit used for producing AM called?

• Modulator

• Transmitter

• Receiver

• Duplexer

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

• Amplitude modulation

• Modulation frequency

• Modulation index

• Ratio of modulation

What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V?

• 100

• 91

• 83.33

• 0

What is the wave of frequency that occurs at the sum and difference of the carrier and modulating signal is called?

• Noise signals

• Sideband

• Extraband

• Neutral band

The type of signal transmission in which no power is wasted on the carrier is known as ________

• Amplitude modulation

• Frequency modulation

• Sideband suppressed carrier signal

• Unsuppressed carrier