MCQ

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

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

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

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

What is the effect of distortion?

• a) Total information loss

• b) Error information

• c) Attenuated information

• d) Amplified information

What is the circuit used for producing AM called?

• a) Modulator

• b) Transmitter

• c) Receiver

• d) Duplexer

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

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

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

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