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2nd Year Instrumentation > Definitions > Flashcards

Definitions Flashcards

1
Q

FCE stands for

A

Final control element

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2
Q

CO stands for

A

Controller output

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3
Q

PV stands for

A

Process Variable

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4
Q

UTP stands for

A

Upper trip point

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5
Q

LT stands for

A

Level transmitter

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6
Q

LTP stands for

A

Lower trip point

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7
Q

Def : ripple

A

A variation in dc voltage magnitude

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8
Q

Def : seebeck effect is

A

Redistribution of electrons when one end of the conductor is heated

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9
Q

Def : law of intermediate metals?

A

The introduction of a third metal into a cct has no effect on Eo if the junctions created by 3rd metal are the same temp

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10
Q

Rtd temp coefficient def

A

Temp resistance compared to temp change

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11
Q

Def ice point (rtd)

A

Ohms at 0’C

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12
Q

Def : control algorithm

A

A mathematical representation of the control action being performed

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13
Q

Def : Control action (P)

A

Control action where there is a continuous linear relation between output and input

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14
Q

Def : control action, integral (reset)

A

The RATE OF CHANGE of the output is proportional to the input

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15
Q

Def : control action, derivative (Rate) (D)

A

The RATE OF CHANGE of the output is proportional to the RATE OF CHANGE of the input

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16
Q

Def : control action, proportional-plus-integral (PI)

A

The output is proportional to the linear combo of the input and time integral of the input

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17
Q

Def : control action, proportional-plus-derivative(PD)

A

The output is proportional to a linear combination of the input and the time rate of change of the input

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18
Q

Def : control action, proportional- plus -integral-plus -derivative

A

The output is proportional to a linear combo of the input , the time integral of the input and the rate of chang of the input

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19
Q

Def : stable control

A

The PV eventually reaches a constant value after an error occurs

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20
Q

Def : unstable control

A

The PV oscillates wildly after an error occurs

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21
Q

Def : controlled variable (CV)

A

A process variable (PV) that is to controlled at a desired state by manipulate another process variable

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22
Q

Def : negative feedback

A

Returning part of an output signal and using it to reduce the value of the output signal

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23
Q

Def : stability

A

Freedom from undesirable deviation

24
Q

Def : step change

A

The change from 1 value to another in a single increment of negligible time

25
Def : transient
The behavior of a variable during transition between 2 steady states
26
Def : damping
Reduction of oscillations in response to a step change
27
Def : bias
The CO required to maintain the balance between SP and PV
28
Def : offset Solution?
Controller thinks the 2 are @ the same point. Caused by spring not matching controller. Solution: adjust spring
29
COo is
Bias spring
30
Def : proportional gain? Adjusted by?
- regulates how much CO changes after an error - physical knob
31
Def : pump head
The height of a vertical column of liquid that the pump holds up
32
Def NPSH Pump
Net positive suction head Measure of the pressure at the pump end of the outlet
33
Def : incident radiation
The energy hitting a body in the form of waves or particles
34
Def : absorbed radiation
Radiant energy absorbed through a body
35
Def : reflected radiation ? Symbol?
Is the radiant energy reflected by a body Symbol R
36
Def : transmitted radiation? Symbol?
Transmitted through a body Symbol T
37
I = A + R + T = 1 is for
Sum of incident radiation
38
Def : Emissivity
The ratio of radiant energy an object emits dived by the amount of energy a black body emits at the same temp
39
Def : blackbody
Absorbs all radiation and radiates more than any other
40
Controllers ADC is
Analog to digital
41
Controllers DAC is
Digital to analog
42
Def :Grey body
Object with emissivity of less than 1. Same at all wave lengths
43
Def : non grey body
Emissivity varies varies with wave length and temp
44
Def flocculation
Chemical process to remove coloital and spended solids ( particles attract of the colotals)
45
Def : conduction (heat)
Heat transfer from high heat to low heat in same object
46
Def : convection (heat)
Heat transfer from 1 location to another
47
Def : radiation ( heat)
Heat transfer through space
48
Def : crystallization
Separates solids from liquids by dropping heat till solids precip out as crystals
49
UEL IS
Upper explosive limit
50
OEL is
Occupation exposure limit
51
LEL IS
lower explosive limit
52
Vena contracta
Point of lowest pressure and highest velocity
53
KPaa
Kp atmospheric
54
KPabs
Absolute pressure (all)
55
KPag
Gage pressure
56
HUH

2nd Year Instrumentation (8 decks)

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