Quiz 2

Question 1

RS-485 is often referred to as a

Answer 1

Serial Standard

Question 2

Modbus uses which of the following methods for media access

Answer 2

Polling

Question 3

The most common form of digital communication is

Answer 3

Serial

Question 4

The shield on Belden signal wire must grounded at

Answer 4

The receiver

Question 5

What is the interface used with DTE’s and DCE’s

Answer 5

RS-232

Question 6

The 8-bit extended ASCII code consists of

Answer 6

256 distinct combinations

Question 7

The carrier protocol CSMA/CD means

Answer 7

Carrier Sense Multiple Access Collision Detect

Question 8

An analog signal has the following characteristics

Answer 8

Varies in a continuous matter

Question 9

Demodulation is a process that

Answer 9

Separates data from a carrier signal

Question 10

The term that refers to communication system capable of communications in both directions but in only one direction at a time is

Answer 10

Half-duplex

Question 11

Computer data referred to as BYTE

Answer 11

Is 8 bits of data

Question 12

Modbus may have up to _____ slave addresses

Answer 12

247

Question 13

The name given to hardware and software rules, as well as procedures to ensure data is transferred correctly

Answer 13

Protocol

Question 14

Fieldbus protocol features

Answer 14

Digital signals using digital transmitters

Question 15

RS-232 is often referred to as a

Answer 15

Serial standard

Question 16

The correct ladder logic program for to start and stop a pump if the field hardware are NO contact type switches is

Answer 16

B (picture)

Question 17

SCADA systems can reliably monitor and control a process only with an operator’s supervision

Answer 17

False

Question 18

To increase the number of inputs and outputs of the PLC, once can use expansion modules

Answer 18

True

Question 19

In gas flow calculations case, when you decrease the temperature you will see the gas flow will decrease.

Answer 19

False

Question 20

Polling is performed when

Answer 20

The master requires information

Question 21

Which one of the following is not a computer based leak detection monitoring system

Answer 21

Realflo gas meter

Question 22

In RTU input, one differential pressure transmitter pressure scale is 0- 150 kPa, reading is 37.5 kPa of scale; If the flow range is 0 - 36 m3/h. this implies the flow is:

Answer 22

18 m3/h

Question 23

Why is an uninterrupted power supply (UPS) important?

Answer 23

Provides uninterrupted power to mission critical devices.

Question 24

Which part of message format provides the message security checks and means of denoting the end of the message

Answer 24

Message termination

Question 25

_____________ Is the ability to detect errors in the original information transmitted and types of noise on the communication channel

Answer 25

Security

Question 26

In the gas flow calculation case, when you increase the differential pressure you will see the gas flow will decrease.

Answer 26

False

Question 27

In a RTU flow loop, it show the flow is 56.3% of the range and the differential pressure to the transmitter has a range of 0 to 100 inches H2O. The differential pressure in engineering units is

Answer 27

31.6 in H2O

Question 28

Which of the following is not one of the main categories of pipeline failure

Answer 28

Operation within design limit

Question 29

RTU configuration program is stored in

Answer 29

EEPROM

Question 30

Which part of the message format provides the signals to synchronize the receiver and transmitter

Answer 30

Message Establishment

Question 31

The term used for obtaining data from sensors via amplifiers and multiplexers and any necessary analog digital converters is

Answer 31

Data acquisition

Question 32

The computing device in the field that contains input/output (I/O) terminals connected to the transmitters and final control actuators

Answer 32

RTU

Question 33

PLC is a common component of SCADA system

Answer 33

True

Question 34

The MTU consists of the following

Answer 34

Driver, Database, HMI

Question 35

In gas flow calculation case, when you decrease the orifice diameter you will see the flow decrease

Answer 35

True

Question 36

Which one of the following is not a purpose of pigging technique

Answer 36

Repairing

Question 37

Operations and supervisory personnel can communicate with SCADA systems via radios, telephone line modems, networks, the internet, satellite links and/or cellular telephone systems

Answer 37

True

Question 38

Gas flow measurements using flow-computer require a total gas composition equal to 100 percent

Answer 38

True

Question 39

In Unity Pro XL PLC programming, "I" is used for output and "Q" is used for input

Answer 39

False

Question 40

In Gas Flow measurement case, when you decrease the statics pressure you will see the gas flow increase.

Answer 40

False

Question 41

An orifice mass flow equation used for gas flow calculation is

Answer 41

AGA-3

Question 42

The pump status is often transmitted from the RTU to the MTU

Answer 42

True

Question 43

Communication by half duplex means

Answer 43

Data travels in both directions but not at the same time

Question 44

ASCII is an acronym that is defined as

Answer 44

American Standard Code for Information Interchange

Question 45

In a token passing protocol with a large number of nodes, the data transfer is

Answer 45

Relatively slow

Question 46

The advantage of using fiber optics as a communication media is

Answer 46

Noise immunity

Question 47

The term that refers to a communication system capable of communications in both directions simultaneously is

Answer 47

Full-Duplex

Question 48

Noise signals induced by high voltage cables in the same tray are called

Answer 48

Noise, communications interference, cross talk

Question 49

ISA/OSI acronym means

Answer 49

International Standards Association / Open System Interconnect