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4 year Apprentiship Exam > 4 year Apprenticeship Exam > Flashcards

4 year Apprenticeship Exam Flashcards

1
Q

What does a decoupler used in a multivariable control system do?

A

Remove loop to loop interaction

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2
Q

In a 2x2 multivariable system with controlled b1 and b2 and manipulated variables m1 and m2. with m2 constant a 10% change in m1 caused a 7% change in b1 and a 12% change in b2. with m1 constant a 1% change in m2 caused a -12% change in b1 and a 5% change in b2.Analysis of the OLM will show that?

A

The system has a positive open loop matrix

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3
Q

Ratio control is define as?

A

One controlled variable controlled with a ratio to another measured variable.

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4
Q

If 14mA is input a Ratio (r=0.5) is input will be?

A

9mA

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5
Q

Feed Forward control is define as?

A

Information relating to one or more measured disturbances is fed into a controller to reverse the effects of the disturbances on the controlled variable

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6
Q

Feed Forward control with feed trim is used because?

A

Model errors are responsible for causing deviation of the controller output from the controlled variable

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7
Q

Feed Forward control uses what to help control loop?

A

Measures Disturbances

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8
Q

A controller using split range control has a valve A open from 0-100% when the controller is outputting 0-50% 4-12mA and a valve B open from 0-100% when controller is outputting 12-20mA. What is the position of valve B if the controller is outputting 75%?

A

50%

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9
Q

A problem with split range control is?

A

Only one set of tuning parameter is available

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10
Q

Two characteristics used in Distillation control are?

A

Vaporization and Condensation

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11
Q

Reflux Ratio is?

A

Reflux flow/distillate

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12
Q

Flooded trays can be diagnose by?

A

High differential pressure and similar temperature between the trays

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13
Q

Feed into the distillation column should enter…

A

where Feed composition closely matches tray composition

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14
Q

in industrial type boiler has a sudden increase in steam demand will cause steam drum level to?

A

increase

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15
Q

three measurements in boiler steam drum level control are?

A

drum level, Steam flow & Feed water flow

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16
Q

the purpose of ensuring a boiler firing box is operated at negative pressure is?

A

to protect operators from being overcome from CO

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17
Q

One consideration when operating a stack gas heat recovery system is you should….

A

Keep the temperature above the dew point of condensation

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18
Q

How do you control load in a centrifugal compressor?

A

Using Differential pressure

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19
Q

The purpose of a Thermocouple on discharge of a reciprocating compressor is….

A

To prevent equipment damage due to non-rod reversal

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20
Q

How to control surge in a centrifugal compressor?

A

By adjusting recirculating bypass control valve

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21
Q

What is a bypass valve used for in reciprocating compressor?

A

For load control

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22
Q

How to prevent liquid spillover into a compressor?

A

High level dump with high shut down control

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23
Q

What is not part of SIS?

A

Process HAZOP

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24
Q

What is true of a SIS system?

A

Is not included in basic control system (BPCS)

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25
Q

What SIL level is 10000 to 1000?

A

SIL3

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26
Q

Why would PST (Partial Stroke Test) be selected on a SIS control valve?

A

To verify the SIF

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27
Q

What is a baud?

A

Number of discrete signal changes per second

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28
Q

What is a characteristic of RS-232 protocol?

A

-3 to -25 v is a mark

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29
Q

What kind of access method is use by Modbus?

A

Master/Slave

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30
Q

A modem using digital modulation….

A

Receives a digital signal and outputs an analog signal

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31
Q

Digital data can be sent over a PSTN phone network using?

A

A modem that takes digital signal and converts it to analog signal

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32
Q

A Bell 202 modem use this on its main channel?

A

Frequency Shift Keying (FSK)

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33
Q

What topology does HART uses when using digital signal?

A

Multidrop Bus

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34
Q

How many characters per second are transmitted when a serial communication port has the following configuration 7,N, 1 2400 Baud?

A

266.7cps

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35
Q

What is not part of the EM spectrum?

A

Sound

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36
Q

What is a characteristic of UHF?

A

Uses line of sight

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37
Q

What kind of signal is represented?

A

AM (Amplitude Modulated)

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38
Q

What is the processor in SCADA RTU responsible for?

A

Process control

39
Q

What equipment is found at a SCADA host site?

A

Printer

40
Q

Which one of these needs SCADA?

A

Pipe line

41
Q

Why do we need SCADA systems?

A

To connect remote processes with a great distance between them

42
Q

Custody transfer when referring to a SCADA system represents what being traded?

A

A comodity

43
Q

What is needed for a PLC to function?

A

Rack, Controller module, Power supply, I/O modules and Configuration software

44
Q

What is the proper procedure for making changes to a PLC?

A

Upload program, Save old program, Make changes, Download changes

45
Q

Where are configuration and control programs stored in case of power failure?

A

EEPROM

46
Q

What would FBD be used for?

A

Analog controls

47
Q

A process needing analog control and discrete control would use what languages?

A

Ladder/FBD

48
Q

What language is the best for batch control?

A

Sequential Function Chart (SFC)

49
Q

What is IEEE 61120 language?

A

Machine List

50
Q

Two PLC’S are connected using RS-232, what topology is this?

A

Peer to Peer

51
Q

What should be considered when updating a PLC software version?

A

Make sure software is compatible with Hardware

52
Q

What FB value would be connected to the PV of this function block

A

The output of an analog input function block

53
Q

What is the proper procedure to repair broken equipment?

A

Inform operations, Put loop in manual, Make repairs, Commission loop

54
Q

When forcing Logic In PLC what precautions need to be taken?

A

Secure all processes and protect personnel

55
Q

In the following structured text statement what will be used to finish the calculation

A

SUM:= 5.0 + VAR 2 AND 6

56
Q

The following RTU needs to execute a Sequential function Chart program as follow..

A

Pick “A”

57
Q

When installing several devices that are too far away from the PCL what must you also install?

A

Remote I/O

58
Q

When there is a need to trend values, what components od a DCS needs to be added?

A

A data Historian

59
Q

In order to make a DCS controller safe in case of fails, what could be done?

A

Install a Redundant Controller

60
Q

Why do we use Redundancy in DCS sytems?

A

For better Reliability

61
Q

What happens in a DCS with redundant controllers if main controller fails?

A

The second controller will take over automatically

62
Q

Why do we use redundant cabling in DCS systems?

A

In case one cable breaks

63
Q

What is a disadvantage of using the Auto tune feature in DCS system?

A

It will mask the errors in the control scheme

64
Q

When using Trending in a DCS for loop tuning….

A

Data points need to be as close to real time as possible

65
Q

What is NOT a good reason to upgrade software version of DCS systems?

A

To have a new version

66
Q

Why do we have alarm Management software?

A

To prioritize Alarms

67
Q

Priority of alarms from Most to Least critical

A

Gas Leak, Data communication broken, PV out of range

68
Q

What are the main parts of a DCS system?

A

Control data base, HMI & Controller

69
Q

Procedure for making changes to a DCS system?

A

Upload program, Download configuration changes, Verify changes

70
Q

What access level must you have to make changes to a DCS configuration?

A

Administrator

71
Q

What are the main components of a VSD?

A

Rectifier, Filter, Inverter

72
Q

If a VSD has a 4-20mA input and s controlled from 1800-3600rpm, what will the speed be if the input is 8mA?

A

2250rmp

73
Q

what is NOT a purpose of an HMI

A

i think is…Program and configure controller?

74
Q

What type of program must be used to develop an HMI for use on a monitor?

A

Program OR Configuration software

75
Q

How do you connect an HMI to a different manufacturers controller?

A

I/O servers

76
Q

What is a pre-cut column use for?

A

To remove impurities before the main column

77
Q

How is the concentration determined from a chromatogram?

A

Peak area

78
Q

What will happen to IR analyzer detector as IR is passed through sample?

A

Temperature decrease from the sample absorbing IR

79
Q

Describe function of Peltier cooling device?

A

Thermocouple attached to power supply

80
Q

What is the differnce between a GC and an LC?

A

Mobile phase

81
Q

Florescence is what kind of analysis?

A

Secondary emissions

82
Q

NO + O3->NO2and infrared radiation is what kind of reaction?

A

Chemiluminescence

83
Q

How to measure total oxides of Nitrogen?

A

Catalytic conversion of all NOx to NO

84
Q

The chopper in an combined beam IR analyzer does what?

A

Alternates IR to the sample and references

85
Q

What does a mass Spectrometer separates components in to and measures?

A

Ions according to their mass to charge ratio

86
Q

Alberta workplace hazardous protection values for H2S and CO are only given in 1 and 24Hr exposure limits. Why?

A

These substance get oxidized into the atmosphere and convert to SO2 and CO2

87
Q

What accuracy of analyzers must be used to monitor ambient concentrations of SO2, NO, H2S?

A

PPM and PPB detectors

88
Q

When doing maintenance planning, what reduces downtime the most?

A

Preventive/Predictive

89
Q

When stocking spare parts, what needs to be considered?

A

Critical nature of systems

90
Q

What are KPI’s used for?

A

To decrease downtime

91
Q

In order to sign off on a specific task, what must the apprentice do?

A

take an exam and pass

92
Q

Who makes the trade outline?

A

Provincial Apprenticeship Committee

93
Q

What does the Red seal do?

A

Allows inter-provincial mobility

4 year Apprentiship Exam (1 decks)

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