Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Controls Midterm > 104B > Flashcards

104B Flashcards

1
Q

Two types of control systems

A

Open loop
Closed loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Open loops are

A

Manual

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Closed loops are

A

Feedback

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

4 main components in a open and closed loop system

A

Controller
Controlled device
Control agent
Process plant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The controller in a closed loop has three parts what are they

A

Sensor
Comparator
Transmitter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The Controlled device in a closed loop system has two actions what are they

A

Actuator
Final control element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Closed loop system has two extra actions separate from the 4 main controls what are they

A

Manipulated variable
System feedback

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Red wire is

A

24V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Green wire is

A

Fan on/off

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Blue wire is what letter

A

Y

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Blue wire is

A

Cooling (Y)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Black wire is what letter

A

W

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Black wire is

A

Heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

White wires letter is

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

White wire is

A

Neutral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

You can classify a control according to its power source what are the 5 power sources in a control system

A

Internally powered
Pneumatic
Electromechanical
Electronic
Hybrid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Do internally powered control systems need power

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Example of hybrid control systems are

A

Electronic controller
Electromechanical gas valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

An example of a timed on/off mode

A

Heating or cooling anticipator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Anticipator is simply

A

A heater that heats the bimetal sensor of a zone thermostat to cause it to cycle more quickly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

An example of a multi position control mode is

A

Multi burner heating system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Floating control mode is a control process with

A

Upper and lower limits and a fluctuating midrange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

The dead control zone is the

A

Space between a high and low alarm where a float control mode fluctuates

24
Q

The switch conditions for a floating control include if

A

Switch one is on switch two is off
Switch one is off switch two is off
Switch one is off switch two is on

Switch one and two are never on at same time

25
Q

Proportional analog signals include

A

0-10 V dc
2-10 V dc
4-20 mA dc

26
Q

The 3 Proportional electronic control methods include

A

-Proportional contains no signal conditioning on algorithm
- proportional integral contains time algorithm
- proportional integral derivative contains time and temperatures algorithms

27
Q

0V dc is what temperature

A

20°C

28
Q

10V dc is what temperature

A

30°C

29
Q

What is an actuator

A

Converts Electromagnetic signal to force which then produces movement

30
Q

What is ambient temperature

A

Temperature of a surrounding area

31
Q

Analog is a

A

Continuously variable

32
Q

Anticipating controls is

A

Heat and cool anticipator to activate control early

33
Q

What is an aquastat

A

A thermostat that controls water temp

34
Q

What does an average element sense

A

The average duct temperature

35
Q

Capillary tube is

A

A liquid refrigerant control or expansion device between high and low sides that transmits pressure

36
Q

Coefficient of linear thermal expansion is

A

The change in length of a substance per degree change in temperature at a constant pressure

37
Q

What is a control agent

A

The energy that the control system manipulates to cause a change in the controlled medium

38
Q

What is a controlled device

A

The instrument that receives the controller output signal and regulates the flow of the control agent

39
Q

What is controlled medium

A

The substance being changed

40
Q

What is a controlled variable

A

The quantity or condition of the controlled medium that the main controller controls

41
Q

Controller is

A

A device that sense and measures change in that controlled variable

42
Q

Controller feedback is

A

The signal that represents change in a measured variable

43
Q

Direct acting is

A

The output signal changes in the same direction that the controlled or measured vairable changes

44
Q

What is invar

A

Metal alloy that consists of nickel and iron

45
Q

Low limit control is

A

A device that normally monitors the condition of the controlled medium and interrupts the system if it is not at the right temp

46
Q

Peltier effect

A

A difference in temp that occurs at a junction between two different metals with an electrical source
(Heated and cooling seats)

47
Q

Pneumatic is

A

Uses air pressure to operate

48
Q

What is the process plant

A

The element of a control system through which energy transfers between the control agent and control medium

49
Q

Reverse acting is

A

The output signal changes in the opposite direction to the controlled or measured variable

50
Q

Thermocouple is

A

A device for measuring temperature based on the pelieir affect

51
Q

Two types of basic electrical drawings

A

Schematic
Connection

52
Q

Schematic drawings lines are always

A

Horizontal or diagonal

53
Q

Every schematic diagram line should have

A

A load

54
Q

Code needs to be approved by

A

CSA

55
Q

Do you use control systems that aren’t approved by CSA

A

No

56
Q

Order of operations is

A

Chronological order of diagram

Controls Midterm (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions