Engineering: Systems of Communication

To send a message from one person, thing, or place to another is an example of

• decoding.
• receiving.
• transmitting.
• storing.

The person who originates the message is the ...

• Receiver 
• Decoder
• Source
• Encoder

The person who accepts or gets the message is the ...

• Sender
• Receiver
• Encode
• Decode

Television remote controls use infrared (light wave) signals to allow a viewer to change channels from a distance.  Which of the following best describes the operation of the remote control?

• decoding and storing
• storing and retrieving
• encoding and transmitting

Mrs. T's computer hard drive contains the grade information for her class.  The computer hard drive is an example of a

• receiver.
• transmitter.
• storage device.

Jack looks up a phone number that is stored in his cell phone.  This is an example of

• transmitting.
• encoding.
• sending.
• retrieval.

Many cars use a keyless entry system, which allows the doors to be locked remotely. To use this system, the driver pushes a button on a small battery-operated device. The button turns on the encoder in the device. A signal is then sent to the car’s electrical system, which activates the locking mechanism.
What is the destination in this system?

• The person's hand
• The battery operated device
• The door lock
• The electrical system

Many cars use a keyless entry system, which allows the doors to be locked remotely. To use this system, the driver pushes a button on a small battery-operated device. The button turns on the encoder in the device. A signal is then sent to the car’s electrical system, which activates the locking mechanism.

What is the source in this system?

• The person's hand
• The battery operated device
• The door lock
• The electrical system

In the early twentieth century, a person in Boston, Massachusetts, who wanted to send a message to someone in San Francisco, California, gave the message to a telegraph operator. The operator tapped the message in Morse code, and the message was relayed through electrical cables to San Francisco. In San Francisco, an operator translated the signal into English and had it delivered to the address specified.

Which of the following describes the encoding process of telegraph communication?

• giving the message to the operator
• tapping the message in Morse code
• translating the Morse code message
• delivering the message to the address

Which of the following is the best example of a transmitter functioning in a communication system?

• A fax machine prints out an image.
• A satellite dish on the ground receives a video signal.
• A cellular telephone tower sends information to a cellular telephone.