Midterm Review

Question 1

Advantages of using fiber optics vs copper cabling

Answer 1

Increased bandwidth
noise immunity
lower power consumption

Question 2

Undesirable electrical signals which distort or interfere with the original signal

Answer 2

Noise

Question 3

Maximum cable length for RS-485 utilizing a copper conductor

Answer 3

1200 meters

Question 4

How many drivers/masters are allowed on an RS-232 segment?

Answer 4

1

Question 5

How many receiver/slaves are allowed on an RS-422 segment?

Answer 5

10

Question 6

statements about RS-232

Answer 6

RxD carries data from the DCE to corresponding pin on the DTE
CTS is an output from the DCE
DCE stands for Data Communication Equipment

Question 7

The maximum Baud rate for RS-485 is

Answer 7

10 Mbps

Question 8

Cable used to connect a DCE device to a DTE device

Answer 8

Straight through cable

Question 9

_____is NOT considered a common data code used in modern data communication systems?

Answer 9

Morse

Question 10

DCS Manufacturer and system name, was the first on the market

Answer 10

Yokogawa, Centum

Question 11

In what year was the first DCS system commissioned?

Answer 11

1975

Question 12

The rate at which a signal changes

Answer 12

Baud Rate

Question 13

The four most important control devices

Answer 13

DCS, PLC, Smart Instruments and microprocessors

Question 14

A system that has been superseded by newer technology

Answer 14

legacy control system

Question 15

DCS

Answer 15

Distributed Control System

Question 16

How many bits are in a byte

Answer 16

8

Question 17

4 bits

Answer 17

nibble

Question 18

4 bytes

Answer 18

IP

Question 19

2 nibbles

Answer 19

1 byte

Question 20

max integer

Answer 20

255

Question 21

Communication mode used for simultaneous bidirectional communications

Answer 21

Full duplex

Question 22

Basic Cable types

Answer 22

Fiber Optic cable
Coaxial cable
twisted pair cable
two wire

Question 23

The speed of an RS-232 transmission is inversely proportional to the length of the cable

Answer 23

true

Question 24

An asynchronous system incorporates a clock signal so the receiver and transmitter can remain synchronized

Answer 24

false (it has no global clock)

Question 25

a modem is used to convert digital data to an analog signal for transmission over long distances

Answer 25

true

Question 26

A two wire RS422 system is capable of communicating in a full duplex manner

Answer 26

False (4 wires)

Question 27

A two wire RS232 system is capable of communicating in a full duplex manner

Answer 27

True

Question 28

A four wire RS485 system is capable of communicating in a full duplex manner

Answer 28

True

Question 29

A balance, 4 wire transmission system, is only capable of half duplex communications

Answer 29

false (capable of full)t

Question 30

Emile Baudot was the inventor of the first practical telegraph system

Answer 30

false ( he came up with the baud code, baud rate was named after him)

Question 31

Samuel Morse used 5 bits to represent his 32 characters for serial data transmission

Answer 31

False

Question 32

the general property of any copper cable type if that attenuation increases as frequency decreases

Answer 32

False

Question 33

A frequency of 2200 Hz represents a 1 in HART protocol

Answer 33

False

Question 34

10 micron single mode fiber optic cable has the ability to transfer data up to 10000 metres in distance

Answer 34

true

Question 35

A modem is used to convert analog data to a digital signal for transmission over long distances

Answer 35

false

Question 36

The resistance of a copper cable increases as the cross sectional area increases

Answer 36

false

Question 37

A #20AWG cable has a larger diameter than a #14AWG cable

Answer 37

false

Question 38

electrical noise coupling methods

Answer 38

``` electromagnetic radiation electrostatic Impedance magnetic is this right? ```

Question 39

The RS-485 system utilizes a balanced transmission system which requires 2 conductors per signal

Answer 39

true

Question 40

The RS serial communication standard use a POSITIVE voltage to define a logic 0 state, and a NEGATIVE voltage to represent a logic 1 state for DATA lines

Answer 40

true

Question 41

The RS serial communication standard use a NEGATIVE voltage to define a logic 0 state, and a POSITIVE voltage to represent a logic 1 state for CONTROL lines

Answer 41

true

Question 42

resistors at the end of the serial bus topologies are

Answer 42

100-120 ohms