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Electrician Apprentice - Level 4 - Canadian > Automated Controls - Glossary > Flashcards

Automated Controls - Glossary Flashcards

1
Q

How an indicated value conforms to an accepted standard value or true value.

A

Accuracy

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2
Q

Analog to digital converter

A

ADC [A/D]

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3
Q

A signal representing a variable which may be continuously observed and continuously represented.

A

Analogue signal

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4
Q

A decrease in signal magnitude. Also, the reciprocal of gain.

A

Attenuation

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5
Q

A signal path which includes a forward path, a feedback path, and a summing point, and forms a closed circuit.

A

Closed loop

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6
Q

The parameter that is desired to be controlled. e.g. temperature, flow rate, pressure, liquid level.

A

Controlled/process variable

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7
Q

A device which operates automatically to regulate a controlled variable.

A

Controller

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8
Q

Digital to analogue converter

A

DAC

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9
Q

Digital control system

A

DCS

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10
Q

Distributed (Direct) Digital Control - A building automation system in which a microprocessor based control system performs building automation digitally.

A

DDC

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11
Q

The range through which an input can be varied without initiating an observable response.

A

Dead-band

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12
Q

Control action in which the output is proportional to the rate of change of the input.

A

Derivative (rate) control action

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13
Q

Information represented by a set of binary numbers.

A

Digital signal

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14
Q

In a control loop, it is the variable which is sensed to originate a feed-back signal.

A

Directly controlled variable

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15
Q

Information represented by a set of separate and distinct numbers or values.

A

Discrete signal

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16
Q

A component of a device or system

A

Element

17
Q

This is the signal derived in a closed loop control system from the difference between the set-point signal and the feed-back signal.

A

Error signal

18
Q

The return signal which is generated from the measurement of the directly controlled variable.

A

Feed-back signal

19
Q

It is the forward controlling element which directly changes the value of the manipulated variable.

A

Final control element

20
Q

The ratio of the change in output due to proportional control action to the change in input.

A

Proportional gain

21
Q

Control action in which the output is proportional to the time integral of the input.

A

Integral (reset) control action

22
Q

A quantity of condition which is varied as a function of the actuating error signal so as to change the value of the directly controlled variable.

A

Manipulated variable

23
Q

Resistance and temperature are inversely proportional.

A

NTC - Negative temperature coefficient

24
Q

A signal path without a feedback.

A

Open loop

25
Q

Physical or chemical change of matter or conversion of energy. e.g. change in temperature, pressure, temperature, electrical potential, speed, etc.

A

Process

26
Q

Control action in which there is a continuous linear relation between the output and the input.

A

Proportional control action

27
Q

Resistance and temperature are directly proportional.

A

PTC - Positive temperature coefficient

28
Q

The region between two limits within a quantity is transmitted, measured or received.

A

Range

29
Q

The smallest interval between sequential discrete values. e.g. the number of degrees per address produced by an absolute encoder.

A

Resolution

30
Q

The element which directly responds to the measured variable.

A

Sensor (sensing element)

31
Q

An input variable which determines the desired value of the controlled variable. It may be manually set, automatically set or programmed.

A

Set-point

32
Q

The algebraic difference between the upper and the lower range values.

A

Span

33
Q

A device element which converts energy from one type to another.

A

Transducer

34
Q

A transducer which responds to a measured variable by means of sensor (sensing element) and converts it to a standardized transmission signal.

A

Transmitter

Electrician Apprentice - Level 4 - Canadian (13 decks)

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