Brainscape's Knowledge GenomeTM

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


See full index

Distributed Generation > PLC > Flashcards

PLC Flashcards

1
Q

PLCs are used to control electrical circuits that have DC, AC, or AC and DC current.

A

True

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

? grounding is the connection of machinery electrical systems to earth ground to reduce the chance of electrical shock by grounding all non–current-carrying exposed metal.

A

Equipment

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

Sources use electron flow through a(n) ? .

A

PNP Transistor

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

An automatically operated switch is a switch that is activated independent of a person or object.

A

True

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

Direct hardwiring decreases the difficulty of troubleshooting or modifying a circuit.

A

False

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

Terminal strips increase the ease of circuit modifications because most of the wires required to make a change are disconnected and reconnected at the terminal strip.

A

True

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

The number and type of I/Os cannot be changed in a fixed PLC.

A

True

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

The standard unit of memory for a PLC is the byte.

A

False

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

Personal computers (PCs) are the most common programming device used with PLCs.

A

True

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

PCs are used as programming devices on all sizes of PLCs.

A

True

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

Pushbuttons, selector switches, limit switches, and proximity switches are common input devices.

A

True

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

Input devices can be programmed in series, parallel, or in series/parallel combinations.

A

True

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

The placement of programming instructions can be used to minimize CPU scan time.

A

True

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

The ? file contains the following system-related information: CPU type, I/O configuration, and passwords.

A

System Program

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

Counter instructions are located in data table file 5.

A

True

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

A TOF instruction starts timing when the logic preceding the instruction on the rung changes from false to true.

A

False

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

A break is the number of contact positions per pole.

A

False

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

Contactors are required between a PLC output section and high-power load.

A

True

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

? relays draw high current when energized and produce high voltage spikes when deenergized.

A

Solid-State

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

For individual conductors, the color blue is used to identify AC wiring and the color red is used for DC wiring.

A

False

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

The model, rating, and configuration of the PLC and any accessories should be checked against the purchase order.

A

True

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

Program backup is the final step in PLC maintenance.

A

True

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

A test instrument with a rating of CAT III or higher must be used when taking measurements on an electrical system that includes a PLC so the instrument can be used anywhere within the indoor electrical circuits.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

When the type of voltage (AC or DC) is unknown, a measurement should be taken with the meter set to measure DC voltage.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

In-line current measurements can be taken only on DC circuits.

A

False

26
Q

An undervoltage occurs when there is more than a 10% decrease in voltage for 0.5 cycles to one minute

A

False

27
Q

An overvoltage occurs when there is more than a 10% increase in voltage for longer than one minute.

A

True

28
Q

The output voltage from a transformer should not drop more than 15% from a no-load condition to a fully loaded condition.

A

False

29
Q

When a PLC supplies an output voltage, the output power supply will have both a voltage rating and a current rating.

A

True

30
Q

Digital circuits turn loads fully on or fully off.

A

True

31
Q

A variable frequency drive cannot accept an analog signal from a 1-kiloohm to 10-kiloohm variable resistor (potentiometer), a 0-volt DC to 10-volt DC voltage source, or a 4-milliampere to 20-milliampere current source as a control signal.

A

False

32
Q

A digital electrical circuit is a circuit in which the load can be in any operating condition between and including fully on and fully off.

A

False

33
Q

A variable frequency drive outputs an analog signal to a motor that changes the speed of the motor by changing the frequency and current applied to it through its operating range.

A

False

34
Q

Digital circuits operate using binary signals that have only ? operating states

A

2

35
Q

Analog sensors can only be connected to analog input terminals on a PLC.

A

True

36
Q

A relay that uses electronic switching devices in place of mechanical contacts

A

solid-state relay

37
Q

A system that interconnects two or more primary systems to combine the individual advantages of each system to meet the requirements of a given application

A

Combination system

38
Q

A primary system in which electricity is monitored and controlled to send and/or receive information, produce sound or vision, store data, control circuits, or perform other work

A

Electronic System

39
Q

The number of time base interval a timer instruction is programmed to accomplish

A

timer preset value

40
Q

A PLC programming instruction used to track the length of time a machine has been operating or to shut down a process after and accumulative time period of recurring faults.

A

retentive time (RTO) instruction

41
Q

The number of counts a counter has recorded

A

counter accumulated value

42
Q

A type of programming timer that is continuously timing because the XIO instruction preceding the timer is always true

A

free running (repetitive) timer

43
Q

A PLC programming instruction used to keep track of the number of items involved in sinprocess

A

count down (CTD) instruction

44
Q

The section of software that contains information on the processor mode, edit status, force status, and communication drivers of a PLC

A

online bar

45
Q

A button that is animated when a PC is online with a PLC

A

Online Icon

46
Q

The rapid making and breaking of mechanical switch contacts when switch contacts are closed

A

contact bounce

47
Q

A symbol in a flowchart that indicates the beginning and end of a section of a chart.

A

ellipse symbol

48
Q

A PLC state of operation where the operating cycle of the PLC is not running, but the CPU is ready to accept information

A

Program mode

49
Q

A PLC software operation where a PC is monitoring the PLC program and graphically displaying the state of all input and output terminals.

A

On-line monitoring

50
Q

Maintenance that verifies that the master control relay (MCR) is functioning correctly, voltages are within specified range, and no abnormal conditions exist.

A

energized maintenance

51
Q

The ability of carious pieces of equipment to work together with carrying level of noise emission immunity

A

electromagnetic compatibility(EMC)

52
Q

A check that verifies that a PLC program functions properly without the application or process the PLC controls actually being run

A

program check

53
Q

A set of procedures consisting of systematic checks

A

PLC startup

54
Q

A check that verifies that all output components function properly and are wires to the correct PLC output terminal

A

output section check

55
Q

A digital data signal from an external source

A

serial communication signal

56
Q

A voltage that originates outside a PLC enclosure, such as voltage from an eclectic motor drive

A

foreign control voltage

57
Q

A place on a contact that opens or closes an electrical circuit

A

break

58
Q

The movement of a load (in pounds) over a distance (in feet)

A

Work

59
Q

A system or device that allows primary systems to work and/or communicate as one.

A

interfacing system

60
Q

A primary system that monitors operations, displays quantities (values), and indicates the status of machines and processes

A

information system.

Distributed Generation (23 decks)

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