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Automation Technology > Final > Flashcards

Final Flashcards

1
Q

What type of sensor is an RTD?

A

Thermo- Resistor

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2
Q

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

A

A power source

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3
Q

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

A

The resistance goes up as the ambient temperature goes up

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4
Q

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

A

Current

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5
Q

Does a thermo couple clearly have a positive temperature?

A

No

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6
Q

What type of temperature coefficient does a thermistor have?

A

A negative temperature coefficient

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7
Q

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

A

A small amount of voltage

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8
Q

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

A

True

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9
Q

Is the thermocouple the most expensive and complex temperature sensor?

A

No

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10
Q

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

A

Fossil fuel

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11
Q

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

A

Metal

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12
Q

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

A

Forced air furnace

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13
Q

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

A

High and Low pressure

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14
Q

What happens in the evaporator side of the refrigeration cycle?

A

It is where heat is being absorbed

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15
Q

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

A

False

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16
Q

What moves the refrigerant through the system?

A

The compressor

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17
Q

What does the law of thermodynamics tell us?

A

Heat is gained or lost

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18
Q

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

A

Absolute zero

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19
Q

What is the purpose of the refrigeration cycle?

A

Absorb heat

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20
Q

What are the two most common types of temperature measurements?

A

Farienhiet and celcius

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21
Q

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

A

Convection

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22
Q

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

A

It is being absorbed

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23
Q

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

A

High pressure

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24
Q

What can the HMI also be known as?

A

The operator interface

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25
Q

What can the HMI take the place of?

A

Physically wired discrete inputs such as a push button

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26
Q

What can be sent from the PLC to the HMI?

A

An analog input

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27
Q

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

A

Yes

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28
Q

How does the HMI communicate?

A

Ethernet

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29
Q

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

A

More than one location

30
Q

What can be viewed from the HMI screen?

A

Graphs, Trends, and Alarms

31
Q

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

A

Tune a loop

32
Q

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

A

No

33
Q

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

A

False

34
Q

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?

A

False

35
Q

What does it mean if a control loop is hunting?

A

It is not properly tuned or consistently meeting set point

36
Q

What is swan diving?

A

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

37
Q

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

A

Discrete

38
Q

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

A

Proportional Intergral and deritive

39
Q

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

A

The current speed at which the motor is running in HZ

40
Q

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

A

Function Blocks

41
Q

What is point to point level control?

A

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

42
Q

What is continuous level control?

A

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

43
Q

What is level defined as according to a manufacturing process?

A

The height at which a container is filled with a material

44
Q

What is open loop control?

A

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

45
Q

What is closed loop control?

A

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

46
Q

What is process control?

A

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

47
Q

What is motion control?

A

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

48
Q

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

A

Batch

49
Q

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

A

A continuos

50
Q

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

A

DP level transmitter

51
Q

What should one considered when selecting a measurement device?

A

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

52
Q

What is a mechanical measurement device?

A

A paddle wheel or other types of displacement methods

53
Q

What are electronic or indirect measurement devices?

A

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

54
Q

What are power sources in level control?

A

A pump or auger to move material
Static pressure tank

55
Q

What are transfer systems in level control?

A

Pipes and conveyors

56
Q

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?

A

DIV

57
Q

What is the process variable?

A

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

58
Q

What is a measurement device?

A

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

59
Q

What is a set point?

A

Is the designated input value applied to the control loop

60
Q

What is an actuator?

A

It is what alters energy into a mechacnial motion

61
Q

What is a error detector?

A

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

62
Q

What is the manufacturing process?

A

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

63
Q

What is something that negatively affects a manufacturing process?

A

Disturbance

64
Q

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

A

The muscle and actuator

65
Q

What does IP stand for?

A

Internent Protocol

66
Q

What IP version do we use in the lab?

A

IPV4

67
Q

What usually holds all the components of the PLC?

A

The rack

68
Q

What allows all of the components to be powered up?

A

The back plain

69
Q

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

A

The back plain

70
Q

Where is the ladder diagram file stored in the PLC?

A

The CPU

Automation Technology (8 decks)

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