WC Revision 4 (L)

Write YOUR own reg num & Name (ignore the answer)

Example: 01 Miss Tan

Modulation is the process of impressing information onto a _______ signal

• baseband

• carrier

• electrical

• light

which way is NOT the method to make a baseband signal change to a carrier signal?

• amplitude modulation

• frequency modulation

• optical modulation

• phase modulation

Information such as voice, music and data are known as which type of signals?

• base signals

• baseband signals

• carrier signals

• carrier band signals

Carrier signals has the characteristic of

• low frequency signals

• high frequency signals

Why do we need modulation?

• to prevent signal interference

• to prevent baseband signal from transmitting

• to prevent the use of antenna

• to prevent the use of optic fibre

In modulation, the higher the operating frequency, the ________ the antenna size

• bigger

• smaller

Modulated signals is able travel further distance than baseband signals

• True

• False

Which modulation factor given will cause an over modulation?

• 0.5

• 0.9

• 1

• 1.1

Given a modulation index of 0.9, what is the percentage modulation?

• 0.9%

• 0.95%

• 90%

• 95%