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3A2 > Chapter 13: Distributed and Logic Control > Flashcards

Chapter 13: Distributed and Logic Control Flashcards

1
Q

A2C13Q15 RTUs are ________________.
Select one:

a.
Remote terminal units

b.
Located in central control rooms

c.
Restricted telemetry units

d.
Remote telephone users

A

a.
Remote terminal units

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2
Q

A2C13Q10 What can an operator do to stabilize a process?
Select one:

a.
Increase the control output signal

b.
Lower the set point

c.
Switch control from automatic to manual

d.
Switch control from manual to automatic

A

c.
Switch control from automatic to manual

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3
Q

A2C13Q52 Each input and each output is identified with ____________ so they can be identified and addressed by the PLC program.
Select one:

a.
Logical expressions

b.
Code names

c.
Comments

d.
Tag names

A

d.
Tag names

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4
Q

A2C13Q62 Function block diagrams are easier to read because each function block ______________.
Select one:

a.
Controls an entire process

b.
Replaces multiple rungs of a ladder diagram

c.
Is programmed in plain English

d.
Has only a single input and a single output

A

b.
Replaces multiple rungs of a ladder diagram

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5
Q

A2C13Q30 What are panel-mounted alarm annunciators best used for?
Select one:

a.
False alarms

b.
First out alarms

c.
Minor alarms

d.
Critical alarms

A

d.
Critical alarms

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6
Q

A2C13Q36 Before a steam boiler can be fired, all of the permissives must be satisfied. What is the binary logic for this example?
Select one:

a.
OR

b.
AND

c.
IF

d.
NOT

A

b.
AND

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7
Q

A2C13Q48 Which of the following is not part of a ladder diagram?
Select one:

a.
Rails

b.
Outputs

c.
Rungs

d.
Feet

A

d.
Feet

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8
Q

PLCs can do which of the following?
1. Control only a single process.
2. Control multiple continuous processes.
3. Be used in SCADA systems.
4. Control only one process at a time.
Select one:

a.
1, 2

b.
2, 3

c.
3, 4

d.
1, 3

e.
1, 4

A

b.
2, 3

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9
Q

A2C13Q25 What happens when a HI-HI or LO-LO alarm causes a trip?
Select one:

a.
The operator must manually shut down all process equipment in the correct order

b.
The operator must hit the emergency stop button to stop the process

c.
The affected process equipment immediately stops

d.
The control system begins a controlled, fully automatic, sequential shutdown

A

d.
The control system begins a controlled, fully automatic, sequential shutdown

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10
Q

A2C13Q21 On the graphic display of an operator interface unit, which colour is typically used in the power generation industry to indicate a motor that is running?
Select one:

a.
Green

b.
Yellow

c.
Blinking

d.
Red

A

d.
Red

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11
Q

A2C13Q32 What does a NOT logic gate have?
Select one:

a.
Two binary inputs and two binary outputs

b.
Two binary inputs and one binary output

c.
One binary input and two binary outputs

d.
One binary input and one binary output

A

d.
One binary input and one binary output

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12
Q

A2C13Q38 How many rows does the truth table for a NOT gate have?
Select one:

a.
3

b.
2

c.
4

d.
1

A

b.
2

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13
Q

A2C13Q13 ________________ are more vulnerable to viruses and malicious malware.
Select one:

a.
HMIs

b.
SCADA systems

c.
PLCs

d.
DCSs

A

b.
SCADA systems

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14
Q

A2C13Q07 In a DCS, where are ADCs and DACs located?
Select one:

a.
In the discrete I/O modules

b.
Digital I/O modules

c.
Analog I/O modules

d.
Controller microprocessor

A

c.
Analog I/O modules

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15
Q

A2C13Q53 Unlike an electrical wiring schematic, a ladder diagram shows the flow of what?
Select one:

a.
Control logic

b.
Matter

c.
Electric current

d.
Energy

A

a.
Control logic

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16
Q

A2C13Q57 PLC programs can be made easier to read, understand, and troubleshoot when programmed using which of the following?
Select one:

a.
Sequential function charts

b.
Function block diagrams

c.
Structured text

d.
Ladder diagrams

A

b.
Function block diagrams

17
Q

A2C13Q59 What is the function block TON?
Select one:

a.
An off-delay timer

b.
An on-delay timer

c.
A weight measurement counter

d.
A counter that can tell how long a process has been operating

A

b.
An on-delay timer

18
Q

A2C13Q31 Which of the following statements is true?
Select one:

a.
Digital logic uses numbers to the base 10

b.
Digital logic is based on hexadecimal numerical processing

c.
Digital logic can only be triggered by discrete (two position) inputs

d.
Digital logic signals can be triggered by analog signals

A

d.
Digital logic signals can be triggered by analog signals

19
Q

A2C13Q34 What does an OR logic gate have?
Select one:

a.
One binary input and two binary outputs

b.
One binary input and one binary output

c.
Two binary inputs and one binary output

d.
Two binary inputs and two binary outputs

A

c.
Two binary inputs and one binary output

20
Q

A2C13Q44 Which of the following has only two possible conditions?
Select one:

a.
Analog outputs

b.
Discrete inputs

c.
Milliamp signals

d.
Analog inputs

A

b.
Discrete inputs

21
Q

A2C13Q33 What does an AND logic gate have?
Select one:

a.
One binary input and one binary output

b.
One binary input and two binary outputs

c.
Two binary inputs and one binary output

d.
Two binary inputs and two binary outputs

A

c.
Two binary inputs and one binary output

22
Q

A2C13Q26 A process set point is changed. What must happen for it to take effect?
Select one:

a.
The value of the set point must not exceed the process variable.

b.
The control loop must be in automatic

c.
The operator must also change the control output signal

d.
The control loop must be in manual

A

b.
The control loop must be in automatic

23
Q

A2C13Q46 The PLC power supply converts
Select one:

a.
120 VAC or 240 VAC to 24 VDC

b.
120 VDC or 240 VDC to 24 VAC

c.
120 VDC to 24 VAC

d.
Solar power to battery power

A

a.
120 VAC or 240 VAC to 24 VDC

24
Q

A2C13Q40 How can the OR function be illustrated?
Select one:

a.
By an inverter gate

b.
By a rectification circuit

c.
By switches in parallel

d.
By switches in series

A

c.
By switches in parallel

25
Q

A2C13Q23 What is an advantage of panel-mounted alarm annunciators over computer monitor alarm displays?
Select one:

a.
Alarm annunciator panels are more reliable than computer monitor alarms

b.
Alarm annunciator panels are mounted at eye level, so they are hard to ignore

c.
Alarms are time-stamped to help determine the sequence of events that led to the alarm

d.
Operators can quickly recognize an alarm by its location on the annunciator panel without scrolling

A

d.
Operators can quickly recognize an alarm by its location on the annunciator panel without scrolling

26
Q

A2C13Q39 How can the AND function be illustrated?
Select one:

a.
By a normally closed switch

b.
By switches in parallel

c.
By a switch and a relay

d.
By switches in series

A

d.
By switches in series

27
Q

A2C13Q06 Analog to digital converters change the analog signals sent by the ___________ to digital signals used by the ____________.
Select one:

a.
Computer, field transmitters

b.
Controllers, field devices

c.
Field transmitters, controllers

d.
Final control elements, controllers

A

c.
Field transmitters, controllers

28
Q

A2C13Q11 To control processes that cover large geographic areas, it is best to use a ___________ system.
Select one:

a.
PLC

b.
Pneumatic control

c.
SCADA

d.
Distributed control

A

c.
SCADA

29
Q

A2C13Q51 In a ladder diagram, series inputs represent _____________ logic.
Select one:

a.
OR

b.
NOR

c.
NOT

d.
AND

A

d.
AND

30
Q

A2C13Q19 Which of the following communication systems is the most suited for continuous communication between an RTU and the main SCADA computer?
Select one:

a.
Geosynchronous satellite

b.
Fibre optic cables

c.
UHF radio

d.
Cellular phone

A

b.
Fibre optic cables

3A2 (17 decks)

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