chapter 2.Understanding Functions and Operating of various ICT Devices

ICT

page 77 and 79

Evaluation of Chapter 2

Answer...!!!

A. Multiple Choice

1. A.

2. C.

3. B.

4. B.

5. E.

6. E.

7. C.

8. B.

9. A.

10.C.

 

B. Essay

(Answer the following question correctly)

 

1. In ASCII code, by what code is letter W represented ?

2. Name and explain all supporting devices inside a CPU ?

3. What is the abbreviation and the function of ROM ?

4. Name three examples of network interface cards.

5. Name and explain several cables that use on a wired network.

Answer...!!!

1. the latter W is respresented by the number code 87.

2.  - Control unit is to translate commands or intructions in a series and then continues theem to
        the entire computer parts.
    - Arithmetic Logic Unit (ALU) is to proces data by adding,subtracting,comparing,and using
       logical formal
    - Memory is to collect or to store data to run an application program.

3. ROM = Read Only Memory

    function : ROM is to save computer operation program, such as BIOS and booting.

4. ethernet, arcnet, and token ring.

5. a. Kabel UTP (Unishielded Twisted Pair)

      in consists of a pair of plastic wrapped conductor and each is colored. the frequency ranges from 100 Hz to 5 MHz. A UTP connector is required to install a UTP cable on network card, such as RJ 45 connector. The cost of UTP is relatively cheap.

    b. STP cable (Shielded Twishted Pair)

       STP  cable is similar with UTP cable, except that it has double wrap. The middle wrap is a metal shield or metal foil to avoid electromagnetic interference. Other than that STP cable connector and UTP cable connector are alike.

    c. coaxial Cable

coaxial cable consists of a main copper conductor with three wraps. the first and third are plastic wraps. the first and third conductor are isolator, while the second web in the middle is a conductor. the connectors are BNC ( Bayonet Network Connector ). T-connector, and 50 ohm terminator. the terminator acts as a signal buffer in order not to obstruct the original signal.

    d. optical fiber.

optical fiber is made of plastic or glass that acts as a medium for signal transmission in the form of light. connector for the optical fiber is an FO connector. optical fiber enable data transmission speed of Mbps-2 Gbps. moreover, the signal range is farther than any other cable types an as a wider bandwith. the optical fiber is fragile and therefore difficult to be moved and installed, needs an expensive maintenance, and the cost of the optcal fiber is relatively expensive.