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Remote Automation > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

RS-485 is often referred to as a

A

Serial Standard

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2
Q

Modbus uses which of the following methods for media access

A

Polling

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3
Q

The most common form of digital communication is

A

Serial

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4
Q

The shield on Belden signal wire must grounded at

A

The receiver

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5
Q

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

A

RS-232

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6
Q

The 8-bit extended ASCII code consists of

A

256 distinct combinations

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7
Q

The carrier protocol CSMA/CD means

A

Carrier Sense Multiple Access Collision Detect

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8
Q

An analog signal has the following characteristics

A

Varies in a continuous matter

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9
Q

Demodulation is a process that

A

Separates data from a carrier signal

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10
Q

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

A

Half-duplex

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11
Q

Computer data referred to as BYTE

A

Is 8 bits of data

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12
Q

Modbus may have up to _____ slave addresses

A

247

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13
Q

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

A

Protocol

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14
Q

Fieldbus protocol features

A

Digital signals using digital transmitters

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15
Q

RS-232 is often referred to as a

A

Serial standard

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16
Q

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

A

B (picture)

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17
Q

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

A

False

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18
Q

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

A

True

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19
Q

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

A

False

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20
Q

Polling is performed when

A

The master requires information

21
Q

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

A

Realflo gas meter

22
Q

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:

A

18 m3/h

23
Q

Why is an uninterrupted power supply (UPS) important?

A

Provides uninterrupted power to mission critical devices.

24
Q

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

A

Message termination

25
Q

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

A

Security

26
Q

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

A

False

27
Q

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

A

31.6 in H2O

28
Q

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

A

Operation within design limit

29
Q

RTU configuration program is stored in

A

EEPROM

30
Q

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

A

Message Establishment

31
Q

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

A

Data acquisition

32
Q

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

A

RTU

33
Q

PLC is a common component of SCADA system

A

True

34
Q

The MTU consists of the following

A

Driver, Database, HMI

35
Q

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

A

True

36
Q

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

A

Repairing

37
Q

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

A

True

38
Q

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

A

True

39
Q

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

A

False

40
Q

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

A

False

41
Q

An orifice mass flow equation used for gas flow calculation is

A

AGA-3

42
Q

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

A

True

43
Q

Communication by half duplex means

A

Data travels in both directions but not at the same time

44
Q

ASCII is an acronym that is defined as

A

American Standard Code for Information Interchange

45
Q

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

A

Relatively slow

46
Q

The advantage of using fiber optics as a communication media is

A

Noise immunity

47
Q

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

A

Full-Duplex

48
Q

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

A

Noise, communications interference, cross talk

49
Q

ISA/OSI acronym means

A

International Standards Association / Open System Interconnect

Remote Automation (1 decks)

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