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3rd year exam > Last_year_exam > Flashcards

Last_year_exam Flashcards

1
Q

PLASTIC not plasma

A

for what is not a conductor

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2
Q

Accuracy of reading

A

= 2.5%

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3
Q

What is done for a sampling conditioning probe?

A

Dilution & Filtering

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4
Q

What is regular maintenance for a coriollis meter?

A

Requires additional cleaning if dirty process

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5
Q

Where would you put orifice taps on a steam line?

A

Horizontal and below

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6
Q

What does the surface area of coal improve when crushed?

A

Combustion

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7
Q

What is annealing?

A

Relieves internal stress in metals

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8
Q

Water w/ Natural gas burning is a

A

Chemical reaction

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9
Q

Question #3 on Test.

A

Requires minimum voltage (Analog)

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10
Q

O2 in a chem. Reaction is…?

A

Oxydant

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11
Q

DP Trx how does it measure?

A

Infers the height

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12
Q

What benefits in Cascade control?

A

The inner loop Helps stop manipulated variable variances

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13
Q

PI output =

A

?

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14
Q

What does a catalyst do?

A

Speeds up a chemical reaction

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15
Q

Advantage of a grab sample?

A

Cheap/Inexpensive

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16
Q

Selective control

A

low

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17
Q

What is cascade control?

A

Uses output of primary controller to manipulate SP of secondary controller

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18
Q

Pure H2O benefits from what measurement?

A

Conductivity

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19
Q

What controller responds to setpoint & load changes?

A

D (derivative)

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20
Q

For a liquid flow process what should the controller settings be?

A

TA: 0.5, 10

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21
Q

What type of capacitance probe should be used in a conductive solution?

A

Insulated probe

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22
Q

% of reading

A

Gauge

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23
Q

What is a polar covalent bond?

A

Unequal sharing of 2 metals

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24
Q

What is positive displacement?

A

Gas remover : overspeed

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25
Q

Insitu VS. Extractive sampling?

A

Insitu is cheaper

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26
Q

Self regulating

A

Process comes back on its own without control intervention

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27
Q

Characteristic of SMART Trx is?

A

Linearity

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28
Q

Bonding is used to

A

reduce electrostatic, eliminate zero shift

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29
Q

Any petro location is a what?

A

Hazardous location

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30
Q

When an atom lose/gains an electron?

A

LOSES –> atom becomes “+” oxidation occurs GAINS –> atom becomes “-“ reduction occurs LEO the lion goes GER

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31
Q

What is the graph for?

A

PI

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32
Q

What is the sum of error?

A

All possible errors

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33
Q

Derivative responds to?

A

SP and load changes

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34
Q

Magnetic law? Who invented?

A

FARADAY

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35
Q

What is the max loop resistance (ohms)?

A

600 ohm

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36
Q

What is Doppler flow measurement?

A

Change in frequency and time

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37
Q

Valve action

A

Reverse for both

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38
Q

What is lag?

A

Deadtime

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39
Q

What is the difference between coal and CH4 combustion?

A

Coal combustion does not produce H2O C + O2 –> CO2 CH4 + O2 –> CO2 + H2O

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40
Q

What is an I/P?

A

Transducer (Current mA, to, Pressure (PSI, kPa, etc))

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41
Q

Why is pH hard to measure?

A

Logarithmic scale Deadtime Hard to control Non linear Output 10x Difference

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42
Q

I/P current UP?

A

Reverse acting

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43
Q

How does ultrasonic level detection work?

A

Transmits a signal down to fluid and amount of time it takes to come back is inversely proportional to level.

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44
Q

How does a load cell work?

A

More resistance, more load

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45
Q

Pure water benefits from

A

conductivity measurement

46
Q

What is the flow proportionality for vortex meters?

A

Vortices form is directly proportional to the flow rate

47
Q

What is measured during a Rockwell hardness test?

A

Indentation

48
Q

Non

A

Linear

49
Q

Resolution calc. for DAC/ADC Ex. 4 -20 mA input with 10 bits

A

Res. = SPAN/STEP = (20mA – 4mA)/(2^10 1) = 15.6mA/step

50
Q

What does phase lag do when gain decreases in a first order process?

A

Phase lag increases, gain decreases

51
Q

Easiest way to calibrate a nuke meter?

A

Close shutter for full level 50% lvl (2nd Cal point) G.m down vessel wall between wall and detector. Output from detectors adjusted

52
Q

How is a hydrostatic test performed?

A

With H2O

53
Q

What is opacity?

A

Absorption of light in a solution

54
Q

Define multi capacity.­‐

A

A combination of deadtime & first order

55
Q

Why do we ground both sides of a mag meter?

A

To eliminate electrostatic zero voltage shifts (charges)

56
Q

Mechanical property?

A

Ductile

57
Q

What type of process is it if gain changes at different points (3)?

A

Non linear, multicapacity, integrating

58
Q

What is this C=C-C?

A

Propene

59
Q

How do you measure level using radar?

A

Electromagnetic

60
Q

Wet leg

A

?

61
Q

What is group VIIA?

A

Halogens

62
Q

Where is a particulate filter placed?

A

Before the analyzer

63
Q

With a 5% increase in CO & a 10% decrease in PV, what is the gain?

A

= RA, 0.5 gain

64
Q

First order + deadtime?

A

ke ^ dts / 1 + ti S

65
Q

What is a worldwide used analyzer?

A

Chilled mirror

66
Q

Manual bias?

A

PI

67
Q

Valve positioner

A

Cascade Valve signature

68
Q
A

Aromatics benzene (C6H6)

69
Q

pH questions

A

ph > 7 Basic pH

70
Q

How do you determine derivative?

A

Is a measure of how a function changes as its input changes

71
Q

__C4H10 +__ O2 —> __CO2 +__ H2O

A

-A = 1 in front of CO

72
Q

What is measured when analyzing pH or electrical conductivity?

A

Measures activity of ions

73
Q

Coriolis meter maintenance?

A

Clean and perform zero calibrations

74
Q

Different gains in a process means?

A

Non-linear

75
Q

What is kinematic viscosity equal to?

A

kinematic viscosity = dynamic viscosity/density

76
Q

What is K Factor?

A

The amount of pulses per unit of volume . ex. Pulses per gallon, pulses per litre. Q = F * 60 / K

77
Q

What to monitor for stack/flue gases?

A

CO, O2

78
Q

Why is shielding used?

A

To correct electromagnetic interference

79
Q

How is turbidity measured?

A

Scattering of light in a solution

80
Q

Reset wind up in selective?

A

Happens to both controllers Cascade can be eliminated through external feedback by connecting secondary to primary

81
Q

Where do you shield on an instrument loop?

A

At one end only. No shield in the field, at control end only

82
Q
A

2,2 dimethyl butane

83
Q

Valve positioner =

A

Valve signature

84
Q

What is bias?

A

Output of the controller when no errors exist

85
Q

What are the products of coal in complete combustion?

A

CO + O2

86
Q

Q/A =

A

No PID controller calibration

87
Q

What is CV?

A

The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice, valve or other assembly and the corresponding flow rate.

88
Q

What state is IIA?

A

Solids

89
Q

Linear expansion, Temp co efficient expansion distance?

A

14.6 mm

90
Q

What is Accuracy?

A

Defined as the closeness with which the output of a device represents the true value of the input to that device

91
Q

What is the difference between a 2 wire and 4 wire Trx?

A

4 wire : uses 2 wires for power and 2 for 4-20 2 wire: uses both wires for power and 4-20

92
Q

Calibration procedure

A

Zero, the span, repeat

93
Q

Formula for Calcium Chloride?

A

CaCl2

94
Q

Q/A =

A

Reset windup on both controllers

95
Q

Disadvantage of a grab sample?

A

Inaccurate / Bypass line needed

96
Q

Process requiring an Extended diaphragm?

A

Corrosive and slurries

97
Q

What is Repeatability?

A

When you repeatedly input an amount and always get the same output

98
Q

What is molar mass?

A

Mass of one mole

99
Q

Closed loop?

A

Gain —> kc * kp / 1 + kc*kp

100
Q

What oxidizes in H2O?

A

Fe (Iron)

101
Q

What is possibility?

A

Sum of error

102
Q

What is a communication standard?

A

RS 485

103
Q

What is radiation?

A

Time, shield, distance

104
Q

What is traceability?

A

“An unbroken chain”

105
Q

What does benzene look like?

A

?

106
Q

Why are magnetic ground straps important?

A

Prevents stray current from passing through

107
Q

Selective control:

A

Low select

108
Q

What is concentration?

A

mg/5L = ppm

109
Q

Bluff body?

A

Directly proportion to flow

110
Q

An Oxygen Ax detects a 20% increase in the fuel gas, what happens to A/F ratio?

A

AFR (up) and CO (down)

3rd year exam (1 decks)

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