Section 1 Test Flashcards
Uses of nitrogen in a process unit include:
All of these
A vibration measuring device
Accelerometer
Expressed in the distance per unit of time
Rectilinear speed
Safety system that measures vibration compared to critical parameters often with shut down set points
Vibration sensors
A measure of total organic or carbon element in the process up
Total carbon TOC
Air compressor discharge is routed to a knock out drum
To allow moisture to form droplets and collect in the drum
molecular components of a fluid or separated and identified in a column
Chromatography
Measures the fluids ability to conduct electrical current
Conductivity
Separating gases into a spectrum according to mass and charge
Mass spectrometry
Measurement of hydrogen ion concentration
PH
Online unattended instrument that continually monitors process stream for specific para meters
Process analyzer
Contains portions of the process combined over time or distance
Representative sample
Safe reliable and efficient process operation requires that instrument air be:
Clean, dry and reliable
Constant monitoring and analysis of processes is necessary to ensure environmental protection, height mechanical integrity, specific quality of products and __________
Profitability
The primary difference between 100 PV is IG utility air and 100 psi G instrument air is moisture content
True
If the mass remains constant and the density of the liquid in a tank decreases, the level of the liquid In the tank
Increases
Fluid in motion is called_______
Flow
A variable area flow meter is a
Rotameter
Mass flow meter require
No need to compensate for variations in temperature,pressure density and viscosity
Tape float, bubbler, cable+ weight, D/P cell and displacer are examples of what kind of measurement system?
Continuous level measurement
The primary purpose of the Jorgensen type valve used at top and bottom overheated level gauge glass is
To prevent certain release of pressure and fluids in case of glass rupture
Magnet of flow meters require
Electrically conductive fluid
Flow rate it’s most often calculated by
Measuring changes in another variable that varies predictably with changes in flow
The zone of separation between two inmiscable liquids in a vessel is called the
Interface
Measurements comparing the pressure of a vapor space above the liquid level and the pressure at the bottom of the same vessel is called
Hydrostatic pressure measurement
The highest energy cost of operation is associated with which of these flow elements?
Orifice plate
Weir and parshall flume are types of
Open channel flow devices
Which of these vessel configurations yields a uniform unit of volume to unit of level relationship? Each inch of level represents the same volume as every other
Flat bottom – cylinder
Displacer tube uses the principle of _____ To determine level
Buoyancy
Most important characteristic affecting The measurement of the fluid flow
State of matter – liquid, gas or vapor
Considered non-– compressible
Liquids
Mass per unit volume
Density
Property of fluid that normally decreases with increasing temperature
Viscosity
Has sharp edge, engineered, round hole and design information stamped on protruding tab
Orifice plate
Venturi, pitot,Orifice plate
Primary flow elements
Charles, boyles adn gay -lussac are primary in formulating the laws of gas behavior that are used today
True
The secondary control variable in cascade loops
Flow
The pressure developed by a head of liquid will increase with higher density liquids as compared to lower density liquids
True
Smooth flowing fluid typically at lower rates
Laminar flow
Fluid flow with no streamlined and three intermixing
Turbulent flow
Most common primary flow element used in differential pressure measurement systems
Orifice plate
Measures Flow using a metal disc with a precise of hole
Orifice plate
Measures flow using a tapered in the device inserted into a flange connection or sport piece
Flow nozzle
Measures flow using a precisely tapered and outlet reduction in pipe diameter
Venturi tube
Measured flow by comparing pressure of an L shaped tube into the flow and another static pressure to for comparison
Pitot tube
Pressure developed by a head of liquid will increase with higher density liquids as compared to lower density liquids
True
A displacer tube uses the principle of_________ To determine level
Buoyancy
Expressed in distance per unit of time example inches/seconds
Rectilinear speed
Bimetallic strip thermometers work because of different electrical coefficients between the two metals
False
The more heat energy added to a liquid
The greater the pressure exerted on vessel walls
When a fixed number of molecules are spread out over a larger unit area
Pressure decreases
Capacitance Transducers indicate pressure changes as opposing plates move closer and farther from each other
True
Manner in which heat moves through solid matter
Conduction
In a state of thermal equilibrium
No heat exchange occurs
As the force of a fix the area increases, you would expect
The pressure to increase
Factors affecting the force exerted by molecules on each other include
Speed
Density
Mass
The symbol I slash P refers to
Electrical current to air pressure signal conversion
Force divided by the area over which it is applied
Pressure
Changes or tends to change state of rest or motion
Force
Flows and takes shape of the container
Fluid
Force from weight of the atmosphere
Atmospheric pressure
Single Value reflecting the difference into individual readings
Differential pressure
14.7 PSIA
Sea level pressure
Pressure difference indicated by Liquid levels in U – shaped tube
Manometer
C – shaped hollow, elliptical tube
Bourdon tube
Density index when compared to water
specific gravity
In the bubble tube system, Differential pressure is first measured and then translated to a level of measurement
True
A variable measurement changes in a continuous men are mirroring the actual variable
Analog
Compares set point to variable measurement
Control element
Impacts the variable directly, usually changes flow of energy or material
Final element
Usually for relatively simple process
Open loop
Control system provides feedback
Closed loop
There is a continuous update of variable value changes in this type
Closed loop
A measure of the thermal energy in the process
Temperature
Movement of materials, liquid, solid or gas
Flow
Measure of the force applied to an area
Pressure
Measured along a vertical axis
Level
Determined by physical properties, quality or traits
Composition
Can’t cause a problem
Indicator
Packets of ones and zeros
Digital
Air/gas signal pressure
Pneumatic
Is often combined with the primary element
Transmitter
Increase in boiling point
Process conditions with little variation
Force applied over a certain area
Pressure
Which is the hardest working variable?
Flow
