Test Flashcards
RTU Configuration or program is stored in
EPROM
Which part of message format provides the message security checks and a means of denoting the end of the message
message termination
exception reporting means
A technique to reduce the unnecessary transfer of data is to use some for of exception reporting
polling is performed when
The master requires information
in realflo Gas flow calculation case, when you decrease the orifice diameter you will see the flow decrease
True
Not one of the main categories of pipeline failure
Operation within design limit
in Gas flow calculation when you decrease the statics pressure you will see the gas flow will increase
False
In Gas flow calculation case, when you decrease the temperature you will see the gas flow will decrease
False
Which part of the message format provides the signals to synchronize the receiver and trasmitter
Message establishment
Not a computer based leak detection monitoring system
line flow balance
Most basic method of leak detection
walking or driving the pipeline right of way to look for evidence of discolouration of vegetation near the line
A single push button start/stop station with NO contacts, when pressed once the motor starts, when pushed again it does not stop, what is the problem?
Push button input forced on
Point-to multipoint communication means devices designated as slaves exchange data over a communication link through the master station
True
American Gas Association Directive AGA-8 is used for
gas compressibility
Why do pigs require tracking
because they may be monitor remotely using computer
Failure to detect leaks can be broken into____ loss categories
loss of life & property
loss of product and downtime to fix pipeline
environmental impact
_______ is the ability to detect errors in the original information transmitted and types of noise on the communication channel
security
SCADA systems can reliably monitor and control a process on with an operator’s supervision
False
Mass flow calculation means a given substance passes through a given surface per unit of time
True
What form of power is most commonly used as a supply source to power internal components of SCADAPack32?
Direct Current
Operations and supervisory personnel can communicate with SCADA systems via radios, telephone line modems, networks, the internet, satellite links, and/or cellular telephone systems
True
Early SCADA system has easier programming than a PLC system, but poorer remote communications capability
False
In the reflag Gas flow calculation case, when you increase the differential pressure you will see the gas flow will decrease
False
Polling, a commonly used SCADA communication method in which master is in control and sends a request to each slave to send its data and the slave responds
True
A signal that represents only On/Off
Discrete signal
A method used for loading instruction sets in an HMI
drag and drop
A combination of a voltage source, switch, and voltage-sensing device that detects either a voltage or no voltage to represent a 0 or 1
status input
American Standard code for Information interchange, which represents text in computers and communications equipment
ascii
Information that is input or output as a series of time based pulses, which result in a binary string of 0s and 1s
digital
A single input wire for each signal, the source is HI side and all the LO side are common and connected to the ground
single-ended inputs
A switch that will send either a 0 or 1 to the field device to close or open the circuit
status output
the location in the RTU/PLC that allows data to be found
address
A continuous measurable signal sent from a controller or host to a field device
analog output
An open control communications protocol that uses client/server methodology
modbus
