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Control Systems > Midterm > Flashcards

Midterm Flashcards

Controls

1
Q

The manipulated variable and controlled variable are synonymous terms in a closed-loop system.

A

False

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2
Q

The triac is capable of handling more current than the SCR.

A

False

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3
Q

In a typical process control system, the set point is constantly changing.

A

False

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4
Q

The two classifications of industrial control systems are____ controls and____ controls.

A

process; motion

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5
Q

A closed-loop industrial system typically uses____ feedback.

A

negative

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6
Q

The control method used in____ control applications is to sustain a constant condition of the controlled variable.

A

process

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7
Q

An open-loop system does not have a____.

A

feedback loop

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8
Q

The difference between the setpoint and feedback signal is referred to as the____ signal, and is produced by the____ detector.

A

error; error

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9
Q

Altering the____ variable causes the condition of the____ variable to change.

A

manipulated; control

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10
Q

The devicethat provides the muscle to perform work in the closed-loop system is referred to as the____.

A

actuator

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11
Q

The____ is sent to the final control element.

A

control signal

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12
Q

Which of the following influences causes a controlled variable to change?

A

all the above

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13
Q

Which of the following factors contributes to the dynamic response of a single control loop?

A

all the above

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14
Q

The objective of____ control is to prevent the controlled variable from deviating from the setpoint.

A

feed forward

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15
Q

Thyristors are primarily used as____ devices.

A

switching

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16
Q

When the holding current drops below its minimum value, the thyristor will____.

A

turn off

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17
Q

The term trigger refers to turning____ a thyristor device.

A

on

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18
Q

The SCR has____ semiconductor layers and ____ junctions.

A

4;3

19
Q

The SCR is triggered on by a ____ voltage applied to its gate.

A

positive

20
Q

The gate lead of an SCR is used to turn it____.

A

on

21
Q

A ____ voltage can be applied across an SCR.

A

AC;DC(both)

22
Q

Once the SCR is triggered on, it can be turned off in a DC circuit when a ____

A

holding current falls below the minimum point

23
Q

The____ is a bidirectional device.

A

diac

24
Q

The voltage on the emitter of a UJT just before it fires is called the____.

A

peak voltage

25
Q

The____ is primarily used to turn on a triac.

A

diac

26
Q

If the voltage applied to an inverting op amp is 3 volts, the feedback resistor is 20k ohms and Rin is 10k ohms,the output voltage is ____.

A

-6 volts

27
Q

The output of the measurement device is the ____.

A

feedback signal

28
Q

Which elements and signals of a control system do not exist in an open-loop configuration?

A

all the above

29
Q

An error signal develops when which of the following conditions occur?

A

all the above

30
Q

The ____ is tge difference between the condition of the controlled variable and the set point.

A

error signal

31
Q

The final control element is positioned by a signal from the____.

A

controller

32
Q

____ is the elapsed time between the instant a deviation of the controlled variable occurs, and the corrective action begins.

A

Deadtime

33
Q

The setpoint typically remains unchanged in a ____ control system.

A

process

34
Q

A ____ is an example of an unintentional factor that causes the condition of the controlled variable to become different from the setpoint.

A

disturbance

35
Q

If +2 volts is applied to the inverting input of an op amp comparator, and -2 volts is applied to the non inverting input, the output will be at a ____ volt saturation.

A

negative

36
Q

What are the four control modes used by the controller section?

A

bang bang; PID; PIC; P

37
Q

What is the controlled variable in this process?

A

gas pressure

38
Q

What is the manipulated variable in this process?

A

steam flow

39
Q

What is the setpoint?

A

325 psi

40
Q

What is the measured variable?

A

pressure

41
Q

positive

A
42
Q

zero

A

=

43
Q

negative

A

>

Control Systems (1 decks)

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