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Automation Control > Automated Controls > Flashcards

Automated Controls Flashcards

1
Q

What does IoT stand for

A

Internet of things

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2
Q

What is an advantage and disadvantage of an automated system

A

-Ongoing labour is reduced
-initial labour is usually higher

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3
Q

What are three characteristics of an open loop system

A

-requires an operator
-not self correcting
-not feedback

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4
Q

What are three characteristics of a closed loop system

A

-not operator
-is self correcting
-has feedback

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5
Q

Advantages of an open loop system

A

-low initial cost
-easy to install
-simple to troubleshoot

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6
Q

Disadvantages of an open loop system

A

-ongoing labour
-error can occur (human)

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7
Q

Advantages of a closed loop system

A

-self correcting
-reduced ongoing labour
-reduced error
-higher performance

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8
Q

Disadvantages of a closed loop system

A

-high initial cost
-expensive to install
-more complex to troubleshoot

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9
Q

Briefly describe what the error signal does

A

Sees the difference between the setpoint and the sensor signals

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10
Q

What are the 5 most common process variables

A

-temp
-level
-pressure
-rpm
-light

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11
Q

What are the two modes within a closed loop and an open loop

A

-dis-continuous
-continuos

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12
Q

Describe a characteristic of discontinuous control

A

Discontinuous control uses actuators which are either on or off
-digital sensor

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13
Q

What is a characteristic of a continuous control

A

The actuator is variable and is proportional to the difference of the sensor and setpoint

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14
Q

Is continuous control analog or binary?

A

Analog

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15
Q

Is discontinuous control analog or binary

A

Binary

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16
Q

The process variables of a continuous control is dependent upon?

A

-resolution of the sensors
-performance of the actuators
Compliance of the process variable

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17
Q

What does P & ID stand for

A

Piping and instrumentation drawings

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18
Q

What does PID stand for

A

Proportional integral derivative

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19
Q

Explain what each letter represents in PID

A

P proportional- how big is the error

I integral- how lang has the error been present

D derivative- how fast is the error changing

20
Q

Describe what a transducer does

A

Converts one form of energy to another

21
Q

What are most sensors

A

They are transducers

22
Q

What do active transducers do

A

Generate output without external power

23
Q

What do passive transducers do

A

Do not generate an output
Only physically or electrically change
External power supply required

24
Q

Sensors often have two components what are they

A

Primary element
Secondary element

25
Q

What does a sensors primary element do

A

Convert process variable into a format that can be measured

26
Q

What does a sensors secondary element do

A

Convert the primary element into and electric change

27
Q

What does lvdt stand for and how does it work

A

Linear variable differential transformer

Shows output voltage by moving a core through and inductor

28
Q

What’s the difference between an lvdt and lvdt discriminator circuit

A

You can tell if the core has moved up or down

29
Q

What is a low pressure pressure/vacuum sensor

A

Bellows

30
Q

What is a pressor sensor with more pressure than a bellows

A

Diaphragm

31
Q

What pressure sensor has the highest pressure

A

Bourdon tubes

32
Q

What are two types of strain gauges

A

Bonded wire
Piezoresistive

33
Q

What strain gauges is more sensitive

A

Piezoresistive

34
Q

What are the different types of flow sensors 4

A

Flow switch
Manometer(atmospheric pressure gauge)
Turbine flow meter
Magnetic flow meter

35
Q

What are the types of level sensors 4

A

Floats
Switches
Conduction
Ultrasonic

36
Q

What kind of temp co does an RTD have

A

Positive

37
Q

What kind of temp co does a thermometer have

A

Negative

38
Q

What are temperature sensor common outputs 5

A

4-20mA
10-50mA
1-5v
1-10v
3-15psi

39
Q

Is an ic a type of RTD T or F

A

True

40
Q

What does ADC stand for

A

Analog to digital converter

41
Q

What is a controlled variable

A

The parameter that is desired to be changed

42
Q

What does DAC stand for

A

Digital to analog converter

43
Q

What does DCS stand for

A

Distributed control system

44
Q

What does DDC stand for

A

Distributed digital
Control

45
Q

What are the common first letters of a balloon and what do they represent

A

T temperature
L level
F flow
P pressure

46
Q

What are the balloon letters after the first letter and what do they represent

A

I indicator
R recorder
C controller
V valve
A alarm

Automation Control (1 decks)

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