KKEE2183 2024/2025 Quiz

Test question: What is your full name?

Test question 2: Which radio do you normally tune to? and can you provide me with the broadcast frequency?

A complete communication system must include:

• a transmitter and receiver

• a transmitter, a receiver, and a spectrum analyzer

• 
  a transmitter, a receiver, and a channel

• a multiplexer, a demultiplexer, and a channel

Noise in a communication system originates in:

• 
  The transmitter

• 
  The channel

• 
  The receiver

• The environment

In a communication system, what role does the channel play?

• It decodes the message

• It encodes the message

• It transmits the message from sender to receiver

• It amplifies the message

What is the name of the signal travel through a channel?

• Baseband signal

• Modulating signal

• Carrier signal

• Modulated signal

Which is a characteristic of transducer?

• Sense physical changes

• Transform energy to another form

• Include sensor

• Restore baseband signal

Which is the frequency domain representation of this signal?

• 
• 
• 
• 

Let x(t)=3cos⁡(2π⋅1000 t)+2sin⁡(2π⋅3000 t+π/4).

What frequencies are present in the signal?

• 1 KHz

• 1000 Hz

• 3000 Hz

• π/4

Bonus question from an exercise that I asked to do in the textbook.

For the signal given in the Figure, V0=2.5 V.

V1 at 1 Khz is -1.59 V, V2=-0.795 V and V3=-0.53 V

There is minus sign, but the frequency domain representation shows positive V values. What does the negative values mean?