MODULATION MCQ

Why a sinusoidal signal is considered analog?

• a) It moves in both positive and negative direction

• b) It is positive for one half cycle

• c) It is negative for one half cycle

• d) It has infinite number of amplitudes in the range of values of the independent variable

What do you understand by the term analog communication?

• a) A method in which one of the properties of a carrier signal varies in proportion to an instantaneous value of modulation signal

• b) A way for data and computer communication

• c) A numerical coded communication

• d) A suitable method for long distance communication

What is Demodulation?

• a) Process of varying one or more properties of a periodic waveform

• b) Recovering information from modulated signal

• c) Process of mixing a signal with a sinusoid to produce a new signal

• d) Involvement of noise

According to Carson’s rule, Bandwidth B and modulating frequency fm are related as

What is the maximum frequency deviation allowed in commercial FM broadcasting?

• 100 KHz

• 75 KHz

• 150 KHz

• 20 KHz

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

In radio receivers, varactor diodes are used for

• Tuning

• Demodulation

• Mixing

• None of the above

Armstrong method is used for the generation of

Disadvantages of FM over AM are

• Prone to selective fading

• Capture Effect

• Poorer signal to noise ratio at high audio frequencies

• Low bandwidth

The process of varying the parameters of high frequency signal according to low frequency signal is ___