Communication systems

A hearing aid is a small device that contains an amplifier, a battery, a microphone, and a speaker. Which part of a hearing aid functions to detect sounds in the user’s environment?

• the battery

• the amplifier

• the speaker

• the microphone

The picture shows a television satellite dish. The satellite dish is an example of which of the following components of a television communications system?

• decoder

• encoder

• receiver

• transmitter

Which of the following BEST describes the function of an encoder in a telephone communication system?

• It receives transmitted electrical signals.

• It sends electrical signals through a circuit.

• It converts sound to electrical impulses.

• It changes electrical impulses into sound.

Which of the following identifies the primary function of a radio station tower in a communication system?

• transmitter

• encoder

• decoder

• receiver

Sherry is going to use her computer to draw a three-dimensional box. She wants to be able to specify the exact dimensions and angles and to rotate the box as needed on the screen. Which of the following types of programs would Sherry most likely use for this purpose?

• math spreadsheet program

• internet based search engine

• word processing software

• computer aided design program

Which of the following devices would MOST LIKELY be used to convert a drawing on paper into an electronic format that could be viewed on a computer screen?

• scanner

• internet modem

• network router

• printer

A movie studio will use two methods of communication, television and the Internet, to advertise a new movie. Which of the following MUST both methods of communication use in order to show the advertisements to viewers around the world?

• printing to create the images

• software to search for images

• networks to transmit signals

• systems to locate viewers

The international symbol for "No Entry" is a picture of a minus sign (-). Which of the following is the MOST important reason why this symbol is used on roads throughout Europe?

• Symbols take up less space on a sign than words

• European countries have many different languages

• One factory can make signs used by many European countries.

• Small children can understand symbols better than words