Final Flashcards by Owen Feagles

What type of sensor is an RTD?

Thermo- Resistor

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What does a thermistor require to generate a mili amp signal?

A power source

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In an RTD its resistance does what as the ambient temperature does what?

The resistance goes up as the ambient temperature goes up

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What can a thermistor be used to measure what in a circuit?

Current

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Does a thermo couple clearly have a positive temperature?

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What type of temperature coefficient does a thermistor have?

A negative temperature coefficient

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What will two dissimilar metals wires twisted together and dipped in cold water will produce what?

A small amount of voltage

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True or false? A bimetallic strip will turn a system on and off but will not indicate the approximate ambient temperature of a room

True

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Is the thermocouple the most expensive and complex temperature sensor?

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What does a combustion furnace use as fuel to create heat?

Fossil fuel

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An electric arc furnace uses carbon probes to supply electricity into a crucible to melt what?

Metal

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A resistance furnace uses electricity to allow coils to heat. This application is commonly used for what?

Forced air furnace

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What are the two sides of the refrigeration cycle have for pressure?

High and Low pressure

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What happens in the evaporator side of the refrigeration cycle?

It is where heat is being absorbed

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True or false? The condenser in the refrigeration cycle is the hot side of cycle. This can be where heat is gained to the system

False

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What moves the refrigerant through the system?

The compressor

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What does the law of thermodynamics tell us?

Heat is gained or lost

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What is the only point at which molecular movement exists known as?

Absolute zero

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What is the purpose of the refrigeration cycle?

Absorb heat

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What are the two most common types of temperature measurements?

Farienhiet and celcius

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What is the method of heat exchange that occurs through a liquid or gas?

Convection

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What is happening to heat in the evaporator side of the refrigeration cycle?

It is being absorbed

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What side of the cycle is the condenser in the refrigeration cycle?

High pressure

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What can the HMI also be known as?

The operator interface

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What can the HMI take the place of?

Physically wired discrete inputs such as a push button

What can be sent from the PLC to the HMI?

An analog input

Can the HMI receive discrete or analog inputs and outputs from the PLC?

Yes

How does the HMI communicate?

Ethernet

Using a system that can accept an operator interface could allow for control of the system from where?

More than one location

What can be viewed from the HMI screen?

Graphs, Trends, and Alarms

Monitoring a set point can be done from the HMI, what can this help the operator do?

Tune a loop

Do the panel view and the PLC run on the same exact program and application?

True or False? When tuning a loop the objective is to deviate from the set point as often as possible?

False

True or False? In Reference to a control loop, over shooting is known to be a good thing. At the same undershooting is okay as well?

False

What does it mean if a control loop is hunting?

It is not properly tuned or consistently meeting set point

What is swan diving?

When an actuator controlling a process continually goes fully on and then fully off

What type of input are the solenoid valves from the HMI to the PLC?

Discrete

What do the letters P, I, D stand for?

Proportional Intergral and deritive

What is an example of an analog output to the HMI screen?

The current speed at which the motor is running in HZ

What does GRT, LES, EQU, DIV all represent in Rslogix?

Function Blocks

What is point to point level control?

It will have two set points, one to turn the system on and one to turn the system off

What is continuous level control?

It will always monitor one setpoint and try to maintain that set point

What is level defined as according to a manufacturing process?

The height at which a container is filled with a material

What is open loop control?

Cheaper to install Usually no feedback signal Typically requires an operator Usually not automatic

What is closed loop control?

Will have feedback signal Can be automatic Has measurement devices or sensors Can run 24/7 Has a PLC or some type of controller

What is process control?

The set point remain unchanged Objective of the system is to maintain set-point at all times Example is batch process- making cookies

What is motion control?

Also referred to as servo control Uses PID block setpoint changes frequently

A cookie baking manufacturing process is known to be what type of process manufacturing?

Batch

A water treatment plant is considered what type of process manufacturing?

A continuos

What is the type of sensor/ measurement device used in lab to sense the level of water in the tank?

DP level transmitter

What should one considered when selecting a measurement device?

What is the material being measured? What is the cost of the sensor? How accurate does it have to be?

What is a mechanical measurement device?

A paddle wheel or other types of displacement methods

What are electronic or indirect measurement devices?

Conductive probes Radar level detector D.P Cell All sensors with a transmitter or transducer

What are power sources in level control?

A pump or auger to move material Static pressure tank

What are transfer systems in level control?

Pipes and conveyors

When building the on off level controller in lab using the push button program what function block needs to be copy and pasted in from the HMI program?

DIV

What is the process variable?

The main point of the system that the set point is trying to maintain

What is a measurement device?

It is known as the EYE of the system, it provides a feedback signal of the controlled variable

What is a set point?

Is the designated input value applied to the control loop

What is an actuator?

It is what alters energy into a mechacnial motion

What is a error detector?

Compares the set point to the feedback signal and produces an output

What is the manufacturing process?

The operation of actuators and a control system to maintain a controlled variable at its desired set point

What is something that negatively affects a manufacturing process?

Disturbance

If a pump is moving water through the lab station, what can it be considered?

The muscle and actuator

What does IP stand for?

Internent Protocol

What IP version do we use in the lab?

IPV4

What usually holds all the components of the PLC?

The rack

What allows all of the components to be powered up?

The back plain

How do the input, output and CPU all share information?

The back plain

Where is the ladder diagram file stored in the PLC?

The CPU