Test
3rd Year
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Preguntas del test (200)
1What is measured during a Rockwell Hardness Test?
- AMaterial
- BDepth
- CDensity
- DImpact
2Why do we ground both sides of the Magmeter?
- ATo ensure equal voltage at both ends.
- BTo eliminate zero shifts. (Charge)
- CIt is industry standard
- DWe don't
3What is the difference between Coal and Methane (CH4) combustion?
- AOne is a gas and one is a solid.
- BMethane does not require oxygen to burn
- CMethane combustions results in complete conversion to CO2.
- DCoal does not produce water.
4What type of capacitance probe should be used in a conductive solution?
- AInsulated
- BRigid
- CFlexible
- DFloat
5What is the maximum transmitter loop resistance (ohms)?
- AInfinite
- B1 KOhm
- C100 Ohm
- D600 Ohm
6What is kinematic viscosity equal to?
- AKinematic Viscosity = Dynamic Viscosity / Density
- BKinematic Viscosity = csT X Density
- CKinematic Viscosity = Density / Mass
- DKinematic Viscosity = Viscosity X Velocity
7What is the difference between 2-Wire and 4-Wire transmitters?
- A4 Wire contains additional information.
- B4 Wire has both a digital an analog signal.
- C4 Wire uses 2 Wires for power and 2 for transmitting.
2 Wire uses both wires for power and transmitting. - D2 Wire is the only method capable of HART
8What is K Factor?
- AThe amount of pulses per minute. F = Hz * P
- BThe amount of water able to mass through the meter in one minute. (GPM)
- CThe vendor set standard for flow through the meter.
- DThe amount of pulses per minute. Q = F * 60/K
9How is turbidity measured?
- AReflection from a UV Source.
- BScattering of light in a solution.
- CAbsorbtion of light.
- DUltrasonic waves absorbed.
10What is Opacity?
- ASuspended solids.
- BA measure of translucence.
- CAbsorption of light in a solution.
- DThe ability of a fluid to conduct light.
11What is a communication standard?
- AHART
- BModbus
- CFoundation Fieldbus
- DAll of the above
1289. What’s the most accurate way of stating error?
- A% of reading.
- BAbsolute units.
- C% of span.
- D% of Upper Range Value.
13What happens when an atom loses/gains an electron?
- ALoses an electron becomes positive+, oxidation occurs
Gains an electron becomes negative-, reduction occurs - BLoses an electron becomes negative-, oxidation occurs
Gains an electron becomes positive+, reduction occurs - CLoses an electron becomes positive+, reduction occurs
Gains an electron becomes negative-, oxidation occurs - DLoses an electron becomes negative-, reduction occurs
Gains an electron becomes positive+, oxidation occurs
- ALoses an electron becomes positive+, oxidation occurs
14What is the resolution calculation for DAC/ADC?
- ACalibrated Range - Error / Step
- BCalibrated Range / Span
- CStep / Span
- DSpan / Step
15What does a catalyst do?
- ASpeeds up a chemical reaction.
- BStabilizes a chemical reaction.
- CStops a chemical reaction.
- DUsed to measure the energy released from a chemical reaction.
16What are the states of PH?
- APh > 7 Basic
Ph < 7 Acidic
Ph = 7 Neutral - BPh > 7 Acidic
Ph < 7 Basic
Ph = 7 Neutral - CPh > 7 Basic
Ph < 7 Neutral
Ph = 7 Base - DPh > 7 Solvent
Ph < 7 Acidic
Ph = 7 Neutral
- APh > 7 Basic
17What is the easiest way to calibrate a nuclear meter?
- AOpen Shutter for full level.
Close shutter for zero. - BOpen shutter for zero.
Close shutter for full level. - CClose shutter for full level.
Guide source down the vessel wall between the detector and wall. - DNuclear meters do not require calibration.
- AOpen Shutter for full level.
18How does ultrasonic level detection work?
- AA signal is transmitted down to the fluid and the amount of time it takes to return is inversely proportional to level.
- BThe signal is transmitter across the tank and the reflection is inversely proportional to the level.
- CMultiple sensors are used to detect where the signal is strongest.
- DThe amount of soundwave absorbed is proportional to the level in the tank.
19What is doppler flow measurement?
- ADoppler is used to measure weather not flow.
- BThe sensor emits sound @ a fequency. This is reflected back by matter in the stream.
- CDoppler works using radar to measure the flow profile from that we can infer the flow rate.
- DThe sensor emits high frequency radiowaves based on the returned wavelengths we can determine flow.
20What is the flow proportionality for Vortex meters?
- AThe vorticies form is inversely proportional to the flow rate.
- BThe vortex velocity is directly proportional to flow.
- CThe vibrations on the sensor are directly proportional to the inlet flow rate.
- DThe vorticies form is directly proportional to the flow rate.
21What is included in regular Coriolis meter maintenance?
- AMeter should be returned to factory to be proven and refurbished.
- BSensor replacement and a 3-point calibration.
- CCleaning and a zero calibration.
- DAll soft parts should be replaced and the meter should be spanned.
22How does a DP Transmitter measure level?
- AInfers weight of water column
- BDirectly measures weight of water column
- CInfers height of water column
- DDirectly measures height of water column
23What is solution concentration?
- AMass / Volume = Concentration
- BDensity / Volume = Mass
- CPPM= Volume / Particles
- DPPM = Particles / Mass
24What is traceability?
- AThe mark of an analyzer used to measure repeatability.
- BThe ability to map measurement points.
- CTracing a signal over a step change.
- DAn unbroken chain of measurements.
25What are the two most commonly monitored gases on a flue stack?
- ACO, O2
- BCO2, NOx
- CO2, NO
- DCO2, O2
26Water and Natural Gas burning is an example of....
- ABad practice.
- BA chemical reaction.
- CHydro-combustion
- DAn Endothermic reaction
27Different gains in a process means
- AHysterisis
- BNon-Linear Processes
- CLinear Processes
- DThe process is under upset conditions
28What is molar mass?
- AThe weight of one mole.
- BThe mass of an object in a molar solution.
- CThe mass of one mole.
- DThe mass of a solution in it's molar state.
29Where should a particulate filter be placed in a sample system?
- AAt the Inlet.
- BBefore the analyzer or other sensitive components.
- CWithin the fast loop.
- DOn the outlet.
30The bluff body is directly proportional to
- AFlow
- BTemperature
- CPressure
- DVelocity
31Why is pH hard to measure?
- AMeasurement is calculated
- BHard to control
- CDeadtime
- DpH is logarithmic.
32Selective control is.....
- Ais a process in which some condition is checked and a decision is made about whether a certain segment of the program code will execute.
- Bis a process in which the FCE is only actuated when a number of criteria is met.
- Ccontrol that is based on a number of input variables.
- DThe controller is selective of which responses are passed on to the loop.
33A valve positioner can help provide important diagnostics like
- ALoop Gain
- BValve Signature
- CMeasurement Drift
- DThe health of valve components
34What is the standard calibration procedure?
- AZero and Span.
- BZero, Calibration Points, and Span.
- CZero, Calibration Points, and Span. Repeat if necessary.
- DIt depends on the instrument.
35What is repeatability?
- Ais the variation in measurements taken by a single person or instrument on the same item, under the same conditions, and in a short period of time.
- Bmeasuring the same value over and over to see if the error is growing.
- Cthe ability of an instrument to repeat it's signal.
- Dis the variation in measurements taken by a single person or instrument on the same item, under the same conditions, and in a long period of time.
36What is Accuracy?
- AThe difference between a true value and a measured value.
- BThe measure of the difference between an input and output values.
- CThe ability of the measurement to meet the input value.
- DThe degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.
37What are the benefits of Insitu Vs Extractive sampling?
- AInsitu is cheaper and requires less sample conditioning.
- BThere are no advantages each method is required in certain situations.
- CInsitu provides better measurement results and can help trend the process more quickly.
- DExtractive is actually the better method because it is cheaper and more accurate.
38What is the formula for First order + Dead time?
- AKeF + (1-dts/T)
- BD*T(ke*C*pV)
- Cdts / ke(1+TSi)
- D(ke^-dts)/(1+ti*S)
39Linearity of a Smart Tx is an example of....
- AA Tuning Option
- BCharacteristic
- CTrait
- DIs not related to Smart Txs
40Which is a Mechanical Property?
- ATemperature
- BSmell
- CDuctile
- DState
41Which processes require an extended diaphragm?
- AHeavy Oil
- BCorrosives and slurries
- CGas
- DChemical
42Derivative response to changes in.....
- ASP and Load changes
- BSP
- CThe rate of the process change
- DThe integral response.
43Which locations are acceptable for orifice taps on steam service?
- AOffset
- BBottom
- CHorizontal
- DOn top
44Any location where petrochemicals or natural gas may be present is?
- AA hazardous location
- BClass 1 Div 1
- CClass 1 Zone 2
- DA non-hazardous location
45What is the best method for measuring pure water?
- ApH
- BORP
- CConductivity
- DTurbidity
46Which medium is used for Hydrostatic Pressure Tests>
- AProcess Medium
- BOil/Natural Gas
- CWater
- DAir
47Who is the Magnetic Law named after?
- ATesla's Law
- BEinstein's Law
- CNewton's Law
- DFaraday's Law
48What is measured when you're using radar level?
- AThe electromagnetic signal
- BFrequency
- CThe amount of wave length absorbed
- DHow much signal is returned
49O2 in a chemical is.....
- AA catalyst
- BAn oxidant
- CThe dominant reagent
- DAn reducing agent
50In a selective process reset windup happens....
- AOnly to the slaves
- BTo all controllers
- COnly to the master
- DTo all components
51What are the benefits of cascade control?
- AIt helps optimize the inner loop and reduce manipulated variable variance.
- BIt increases the speed of response.
- CIt eliminates over and undershoot.
- DCascade control is only for extremely complicated processes and the benefit is they allow for tight control in these difficult situations.
52What is not a conductor?
- APlasma
- BCopper
- CPlastic
- DWater
53Linear expansion is calculated with....
- AΔL = T α (L2 - L1)
- BL = ΔL α (t2 - t1)
- CΔL = L α (t2 - t1)
- DΔL = L (t2 - t1)
54In a closed loop Gain =
- Akc*kp/(1+kc*kp)
- B(kc*kp)^-1
- C(kc*kp)^2
- D(kc*kp)^1/2
55An Oxygen Analyzer detects a 20% increase in the fuel gas, what happens to the Air to Fuel ratio?
- AThe Ratio increases and CO2 decreases
- BThe Ratio decreases and CO increases
- CThe Ratio increases and CO decreases
- DThe Ratio decreases and CO2 increases
56Manual bias is required for which controllers?
- AProportional
- BProportional and Derivative
- CProportional and Integral
- DProportional, Integral, and Derivative
57A self regulating process will....
- AHave built in controls
- BCorrect the process variable without intervention
- CDoes not exist in reality
- DCannot be controlled
58If an I/P responds to an increase in current with a reducing pressure this is an example of ......... control action
- AMinimizing
- BReverse
- CDirect
- DActuating
59What is the sum of all errors?
- AAll possible errors.
- B% Error * Span
- CCalculated Error + Real Error
- DThe published error
60What group is VIIA?
- ATransitional Metals
- BAlkali Metals
- CNoble Gases
- DHalogens
61What is the normal state for group IIA?
- ASolid
- BLiquid
- CGas
- DDepends on the element
62What organic compound does C=C-C represent?
- APropane
- BPropene
- CBenzene
- DButene
63What is the chemical formula for Calcium Chloride?
- ACa2Cl
- BCACl2
- CCaCl2
- DCLCA2
64Which represents Benzene using Carbon Chains..
- AC-C=C-C=C-C=
- BC=C-C
- CC-C-C
- DC=C-C=C-C=C-CH3
- AC-C=C-C=C-C=
65What type of controller does this graph represent?
- APID
- BPI
- CP
- DCascade
66For liquid flow processes what should the controller settings be?
- ATA= 0.5, 10
- BTA= 1, 5
- CTA= 1, 10
- DTA= 10, 100
67With a 5% increase in CO and a 10% increase in PV, what is the gain?
- A1
- B2
- C0.5
- D1.5
68What reaction will happen if Iron is left in H2O?
- AReduction
- BOxidation
- CIonization
- DPlating
69What is measured when analyzing pH or electrical conductivity?
- ANumber of free ions
- BElectrical current
- CAcidity
- DThe activity of ions
70What is annealing?
- AThe removal of free ions from the metals surface
- BRelieves internal stress in metals
- CAn inert sealing process
- DA blending of graded stainless steel
71_C4H10 + _O2 >>>> _CO2 + _H2O
Please balance the equation.- A1, 1, 1, 1
- B2, 13, 8, 10
- C1, 6.5, 4, 5
- DThis equation cannot be balanced
72What are the advantages of a grab sample?
- AAccurate
- BCheap
- CCan be taken online
- DIs specified and maintained by industry standards
73What are the disadvantages of grab samples?
- AExpensive
- BCannot be accurately verified
- CIs not representative of the process when taken.
- DInnacurate and a Bypass is required.
74What are the two types of turbines?
- AInductance and reluctance.
- BForward and backward.
- CPositive and negative.
- DConventional and Smart.
75How do you determine derivative?
- AIt is determined by the gain and integral of the controller.
- BIt is the rate of change.
- CIt is a measure of how a function changes as the input changes.
- DIt is the value of overshoot to eliminate
76What is a polar covalent bond?
- AUnequal donation of electrons.
- BEqual sharing of electrons.
- CUnequal sharing of electrons.
- DEqual donation of electrons.
77What are the products of coal in complete combustion?
- AC + O2 > CO2
- BC + O2 > CO + O2
- CC + H2O > CO + H2O
- DC + O2 > CO + CO2 + O2
78What type of process has gain changing at 3 points?
- ALinear, Multicapacity, Integrating
- BLinear, Single Capacity, Self Regulating
- CNon-Linear, Multicapacity, Integrating
- DNon-Linear, Single capacity, Integrating
79What is Lag?
- AError below the setpoint
- BDeadtime
- CThe over or undershoot
- DThe time it takes to stabilize the output
80What is bias?
- Ahow the conotrller modulates gain
- BHow the error is calculated in reference to the change in signal
- CThe sum of errors over the step change
- DOutput of the controller when no errors exist
81What type of communication is used in a digital loop with a controller with continuous talking?
- APeer to peer
- BIP
- CModbus
- DHART
82Why is cabling shielding used?
- ATo prevent electromagnetic interference
- BTo prevent the cable from cracking during bending and coiling
- CTo contain the heat and electricity traveling in the wire
- DShielding is used to tell what gauge and specifications apply to the cable
83Why does a transmitter require a minimum voltage?
- AWithout power the display and signal emitter will not function.
- BThe power is required to actuate the sensor
- CTo accurately generate an analog signal
- DNo transmitter can function without power
84What is CV?
- AControl Valve
- BCalculated Velocity
- CControlled Variable
- DFlow Coefficient
85what is the principle of positive displacement meter?
- AUses the displacement of a flapper element to correspond to the volumetric flow
- BDivides the flow media into fixed volumes and as it passes through the flow body the time taken corresponds to the exact flow.
- CBased on the velocity at the entry and exit sensor volumetric flow is calculated.
- DThe size of the flow body will directly correlate to the volumetric flow.
86What function does an I/P complete?
- AConverts voltage to pressure.
- BConverts pressure to current.
- CConverts current to volts.
- DConverts current to pressure.
87Define a multi-capacity process.
- AA combination of dead time and first order
- BWhen multiple process interact and effect the overall control method
- CA process with multiple controlled variables.
- DA process with multiple controllers in a polling system to determine the final output.
88Which is a measurement of a vibration cycle?
- APeak to peak
- BPeriod of oscillation.
- CWave size
- DWave length
89How does a Load Cell work?
- ALess resistance = Less Load
- BLess resistance = More Load
- CMore resistance = Less Load
- DMore resistance = More Load
90Why is coal crushed for combustion?
- AIncreased surface area will generate more heat.
- BIf the coal is not crushed it will not combust. Must be a dust.
- CCrushed coal will have more efficient combustion and produce less CO.
- DIt is easier to transport.
91What functions do a sampling probe offer a Sample System?
- ATransmission & Separation
- BDilution & Filtration
- CIsolation & Filtration
- DPressure Reduction & Flow Rates
92What is cascade control?
- AUses a descending SP to slowly modulate the final control element
- BUses a feed forward strategy to determine a new SP based on the last sent SP
- CMultiple controllers vote towards a master controller which will determine the final SP.
- DUses output of the primrary controller to manipulate the SP of a secondary controller
93In a H2O treatment facility, what is the best analyzer?
- ApH
- BChlorine
- CO2
- DH2S
94What does the distillation analyzer produce?
- ABoiling Characteristics
- BPurity
- CDew Point
- DAll other answers
95What is a worldwide standardized analyzer?
- AMicro Gas Chromatograph
- BDead Weight Tester
- CChilled Mirror
- DOil in Water Analyzer
96What does Phase Lag do in first order processes?
- APhase Lag increases as Gain decreases
- BPhase Lag decreases as Gain increases
- CPhase Lag increases as SP decreases
- DPhase Lag increases as Integral decreases
97If the voltage over a 250 Ohm resistor is 10VDC what is the current?
- A250 A
- B250 mA
- C250 kA
- D2500 mA
98Which O2 Analyzer uses a bridge circuit?
- AThermo-Magnetic
- BElectro-Chemical
- CZirconium Oxide
- DInfared
99What must remain constant with capacitance level measurement?
- AConductivity
- BDensity
- CVolume
- DMoisutre Content
100The SI unit for radiation dose equivalent is which of the following?
- AGray
- BCurie
- CSievert
- DSutherby
101SCR is an acronym for.....
- ASelf Contained Regulator - A regulator that is not pilot or instrument operated
- BSilicon Controlled Rectifier - a device which conducts in only 1 direction.
- CScattered Control Region - When the controller outputs cannot be plotted using a line or wave
- DStrip Chart Recorder - A recording device used to record a measured signal over time.
102What’s the best location of an analyzer used for process control?
- AAs close to the process as possible.
- BIn an heated maintained analyze shack.
- CThe control room.
- DDoesn't matter.
103What happens to electrons when two nitrogen’s bond?
- AGives Electrons, Ionic Bonding
- BShares Electrons, Covalent Bonding.
- CShares Electrons, Metallic Bonding.
- DGives Electrons, Hydrogen Bonding
10410. Given Vout = 24V Gain = 1000, R1 = 5 KOhm, Ro = 5 MOhm calculate Vin of an inverting op-amp, using: Vin=Vo/Av or Vo= (-Rf/Ri)*Vin?
- A0.024 Volts
- B24 Volts
- C0.24 Volts
- D24,000 Volts
105In this circuit, what is the expression for the ratio of output voltage to input voltage (Vout/V1)?
- ARo/R1
- B-Ro/R1
- CR1/Ro
- D-R1/Ro
106In this circuit, you want a gain of ten. Actually, you are going to have to settle for a gain of -10 because you can't get rid of the minus sign. Still, if R1 is 5 kW, what is the value you need to use for R0? Give your answer in ohms.
- A500 Ohms
- B-50,000 Ohms
- C50,000 Ohms
- D-500 Ohms
107In this circuit, you have it set up for a gain of -10. The input voltage is .24v. What is the output voltage?
- A-2.4 Volts
- B2.4 Volts
- C24 Volts
- D-.024 Volts
108In this circuit, you have it set up for a gain of -10. The input voltage is -.35v. What is the output voltage?
- A0.035 Volts
- B-3.5 Volts
- C3.5 Volts
- D-0.035 Volts
109Assuming that you have an inverting amplifier with R1 = 10,000W, determine a value for Ro that will produce an amplifier with a gain of 3.3.
- A-33000W
- B3300W
- C330000W
- D33000W
110Assuming that you have an inverting amplifier with Ro = 4,700W, determine a value for R1 that will produce an amplifer with a gain of -5.
- A23,500W
- B940W
- C-940W
- D-23,500W
111Polarographic cell is good for?
- AUEL level in an atmosphere
- BLEL level in an atmosphere
- CO2 content in a gas
- DAromatics
112How to measure moisture content in a sheet of paper where particle size does not matter?
- AVoltage
- BConductivity
- CMoisture Analyzer
- DInfared Absorbtion
1134-20mA input and 10-bit output, calculate the number of mA per bit?
- A15.6uA
- B15.6 mA
- C0.156 mA
- D15.6 A
114The MSB of an 8-bit system is?
- A1024/8 = 128
- B2^8 = 256/2 = 128
- C2^8 = 256
- D1024 * 8 = 8192
115Method of density measurement using a sample gas column and an air column?
- AWeight Scale
- BGravitometer
- CDensitometer
- DBlower Motor
11616. Faraday’s law states that a conductor moving through a magnetic field generates a?
- AField
- BVoltage
- CCurrent
- DResistance
11717. Which of the following has the fastest response: Zener diode, Avalanche diode, Metal Oxide?
- AMetal Oxide
- BZener Diode
- CAvalanche Diode
- DNone of the above
118Intrinisic Safety is what type of protection?
- AEnergy Limiting
- BContainment
- CPurging
- DGeneral Purpose
119What is the purpose of a Transmitter?
- ATo measure a process variable.
- BProvide a read out indication of a process variable.
- CConverts a measured process variable into a signal.
- DDepends on the transmitter configuration.
120How many current loops are in a PID loop?
- AOne
- BTwo
- CThree
- DFour
121What is the formula for butane?
- AC4H10
- BC6H6
- CC7H8
- DC3H6
- AC4H10
122What is NH4CL?
- AAmmonia Chloride
- BAmmonium Chloride
- CTable Salt
- DSodium Chloride
123Please balance _CH2 + _O2 --> _CO2 + 2H2O
- A2, 6, 2,
- B2, 4, 2
- C4, 12, 4
- D1, 1, 1
124What is a property of Alkanes?
- AExtremely reactive.
- BSaturated and don’t react readily with other hydrocarbons.
- CDoes not react with any other substances.
- DSoluble in water.
125Why is it hard to control PH?
- AThe titration curve is non linear.
- BVery high resistance in probe.
- CVery small voltage change.
- DAll of the above.
126Given this chemical reaction in a boiler what are the products and reactants?
CH4 + 2O2 → CO2 + 2H2O- AProducts: CO2, H2O
Reactants: CH4, O2 - BProducts: CH4, O2
Reactants: CO2, H2O - CProducts: CO2, O2
Reactants: CH4, H2O - DProducts: CH4, H2O
Reactants: CO2, O2
- AProducts: CO2, H2O
127A smart valve senses what?
- APosition
- BPressure
- CTemperature
- DAll answers
128What is the purpose of the Teflon coating in a Magnetic Flow Meter?
- APrevents corrosion of the meter and electrodes.
- BPrevents the generated signal from shorting to pipe.
- CThe coating must be soft to create the right flow profile.
- DWithout the coating the flanges will not be able to hold the meter in the correct position.
129What is the material in an O2 analyzer membrane?
- ATeflon
- BPFA
- CTefzel
- DHard Rubber
130How do you measure flow in a trench? (Most Common Method)
- AWeir
- BPaddlewheel
- CFlow Nozzle
- DTurbine
131When transistors are used in digital circuits they usually operate in the:
- ABreakdown Region
- BActive Region
- CLinear Region
- DSaturation and Cutoff Regions
132Three different Q points are shown on a dc load line. The upper Q point represents the:
- AMaximum Current Gain
- BMinimum Current Gain
- CIntermediate Current Gain
- DCutoff Gain
133A current ratio of IC/IE is usually less than one and is called:
- ABeta
- BTheta
- CAlpha
- DOmega
134In a C-E configuration, an emitter resistor is used for:
- AStabilization
- BAC Signal Bypass
- CCollector Bias
- DHigher Gain
135With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:
- AHigh Resistance
- BOpen
- CLow Resistance
- DInfinite
136Voltage-divider bias provides:
- AA Q point that is stable and easily varies with changes in the transistor's current gain.
- BA Q point that easily varies with changes in the transistor's current gain.
- CA Stable Q point.
- DAn unstable Q point,
137To operate properly, a transistor’s base-emitter junction must be forward biased with reverse bias applied to which junction?
- ACollector-Emitter
- BBase-Emitter
- CBase-Collector
- DCollector-Base
138The C-B configuration is used to provide which type of gain?
- ACurrent
- BVoltage
- CResistance
- DPower
139The ends of a load line drawn on a family of curves determine:
- AThe Operating Point
- BSaturation and Cutoff
- CThe Amplification Factor
- DThe Power Curve
140Which is beta’s current ratio?
- AIc/Ie
- BIc/Ib
- CIb/Ie
- DIe/Ib
141The Q point on a load line may be used to determine:
- AVcc
- BVc
- CVb
- DIc
142A transistor may be used as a switching device or as a:
- AFixed Resistor
- BRectifier
- CTuning Device
- DVariable Resistor
143When a silicon diode is forward biased, what is VBE for a C-E configuration?
- AEmitter Voltage
- BVoltage-Divider Bias
- C0.7V
- D0.4V
144With low-power transistor packages, the base terminal is usually the:
- AStud Mount
- BMiddle
- CRight End
- DTab End
145A collector characteristic curve is a graph showing:
- ACollector current (IC) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant.
- BEmitter current (IE) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant.
- CCollector current (IC) versus collector-emitter voltage (VC) with (VBB) base bias voltage held constant.
- DCollector current (IC) versus collector-emitter voltage (VCC) with (VBB) base bias voltage held constant.
146What is the current gain for a common-base configuration where IE = 4.2 mA and IC = 4.0 mA?
- A1.05 mA
- B0.20 mA
- C16.80 mA
- D0.95 mA
147If a 2 mV signal produces a 2 V output, what is the voltage gain?
- A0.004
- B100
- C0.001
- D1000
148With a PNP circuit, the most positive voltage is probably:
- AVcc
- BGround
- CVbe
- DVc
149Most of the electrons in the base of an NPN transistor flow:
- AInto the base supply
- BInto the emitter
- CInto the collector
- DOut of the base lead
150In a transistor, collector current is controlled by
- AAll of the below.
- BBase Current.
- CCollector Voltage.
- DCollector Resistance.
151What is the most reliable form of density measurement
- ABubbler
- BDifferential Pressure
- CDensitometer
- DWeighted Flow
152Using Psychometric chart find dew point given dry air 20 Deg C, wet air 13 Deg C?
- A10 Deg C
- B8 Deg C
- C7.6 Deg C
- D7 Deg C
153Integrating op-amp, what happens when Rf opens? Vo= (Rf/Ri) + 1*Vin
- ANegative Rail
- BPositive Rail
- CClipping
- DDC Offset
154Whose law refers to flow head or head pressure?
- AEinstein
- BFaraday
- CBernoulli
- DNewton
155Name a disadvantage of positive displacement meters?
- AInaccurate
- BMechanical wear
- CRequires 20 upstream pipe diameters
- DHard to calibrate
156What is an example of a PD meter?
- ANutating Disc
- BRotating Vane
- CReciprocating Piston
- DAll of the above
157What’s the advantage of a turbine flow meter?
- AHigh Accuracy, Repeatibility
- BNo Moving Parts
- CNever Requires Calibration
- DProvides cheap mass flow readout
158How does the Magnetic Shuttle ball Vortex Shedding meter measure?
- ACapacitance
- BImpedance
- CResistance
- DInductance
159What type of flow has a Reynolds’s number of 10,000?
- ATurbulent
- BLaminar
- CTransistional
- DNone
160What form of excitation in a Magnetic Flowmeter performs zeroing?
- AAC
- BDC
- C3-Phase
- DPulsed DC
161What is a requirement for an ultrasonic Doppler flow meter?
- AGood Pipe Contact with Transducer
- BLaminar Flow
- CSuspended Solids or Bubbles
- DAll of the above
162Using the HART communicator it must be in what with resistor?
- AParalell
- BSeries
- CIt can be in any circuit
- DLine
163Most accurate form of temperature measurement?
- AThermocouple
- BThermometer Bulb
- CRTD 3 Wire or 4 Wire
- DThermistor
164Advantage of a Pyrometer?
- AAllows for multiple temperature measurements at once
- BNever requires calibration
- CNo moving parts and no physical contact
- DCan be used at a distance
165What is a Pyrometer`s principle of operation?
- AExcitation of the laser frequency corresponds to temperature.
- BHot objects radiation is compared to a tungsten lamp. Thermal radiation given off by an object is a function of its absolute temperature.
- CThe change in temperature of the metal generates a voltage.
- DThe change in tensile strength corresponds to the change in temperature.
166Disadvantage of a thermistor?
- AHigh Negative Temperature Coefficient
- BLow Temperature Coefficient
- CNon-linear
- DA & C
167Why does a Thermocouple have reference temperature compensation?
- ATo generate voltage a neutral source is required.
- BTo compensate for ambient temperature changes.
- CTo compensate for the junction created at the transmitter terminals.
- DB & C
168A Thermocouple measures
- AReference Temperature
- BTemperature difference between measurement junction and reference junction
- CReference Junction
- DNone of the above
169What are the benefits of using a Thermocouple?
- AWide Temperature Range
- BHigh Accuracy
- CWide Temperature Range and Simple
- DA & B
170What is a method of calibrating a Thermocouple?
- APlace the reference junction in an ice bath and measure ambient temperatures.
- BMeasure ambient temperatures with reference tables.
- CThey must be laboratory calibrated.
- DThermocouples cannot be calibrated.
171What is derivative?
- AAccounts for present values of errors.
- BAccounts for past errors and uses it to respond to new changes.
- CRate of PV change over time, ΔPV/Δt. Rate of change of error/change in time, Δe/Δt.
- DA control method for rapidly changing processes.
172Given PB=50%, Reverse acting, step Input of 5% increase, what is the open loop response?
- A10% Decrease.
- B10% Increase
- C5% Decreae
- D5% Increase
173Given 0-6mV input and 4-20mA output, what is the gain?
- A1
- B100
- C667
- D332
174With a 250Ω resistor, with 4-20mA across, what is the voltage?
- A1-5 Volts
- B10-30 Volts
- C2-10 Volts
- D0-24 Volts
175Why is an H2S or Ammonia detector not good in other toxic environments?
- AThey are fine for all environments.
- BThey can cause an explosion.
- COther combustible gases can change the response of the detector.
- DToxic environments will damage the sensor providing false readings.
176Given 2% CH3 and the UEL of CH3 is 5.3%. What’s the LEL?
- A10%
- B38%
- C15%
- D1%
177What are the most common components to monitor in stack gases?
- ANOx
- BSOx
- CCO, CH4
- DO2, CO2
178Definition of Opacity?
- AThe density of a solution.
- BAmount of light alternation due to absorption or reflection by a solution.
- CThe viscosity of a solution.
- DNone of the above.
179What is the principle of operation of an ultrasonic level detector?
- ATime it takes for a sound pulse to travel from a sensor to reflecting surfaces & back to the sensor. Measured time for the sound to bounce and return.
- BHow much sound is absorbed as it passes through the fluid.
- CThe amount of vibration in the sensor based on the frequency of the fluid.
- DNone of the above.
180What are some good processes for ultrasonic level detection?
- ACorrosive or Reactive Fluids.
- BHydrocarbon storage cavity, chip bin. Solids.
- CInterface and Multi-phase Solutions
- DAll of the above.
181With no current output in a loop, what is the first thing to check?
- AWire
- BResistor
- CPower Supply
- DVoltage
182Given an alarm circuit diagram, if the Vsupply increases by 2V, what happens?
- ALow and high alarm set points increases.
- BHigh alarm set point increases.
- CLow and high alarm set points decreases.
- DLow set point decreases.
18370. What is the accuracy of Draegar tubes?
- A+/- 5%
- B+/- 10%
- C+/- 25%
- D+/- 50%
184What is sensed by lead acetate tape?
- ANOx
- BH2S
- CSOx
- DCO2
185What is sour gas?
- AH2S
- BToxic CH4
- CHighly Reactive Natural Gas
- DDown well CO2
186What is the limitation of a Coriolis Mass flow meter?
- A6" Body Flanges.
- BUpstream/Downstream Pipe Diameters.
- CBoth A & B.
- DNone of the above.
187Which is a type of gas density measurement?
- AUltrasonic
- BCentrifugal
- CCoriolis
- DThermal Mass
188Where to place a hydrogen detector in a compressor building?
- ADown Low.
- BUp High.
- CMiddle Height
- DA & B
189Which of the following is being reduced in the following:
S + O2 ---> SO2
SO2 + H2O ---> H2SO3- ASO2 + H2O ---> H2SO3
- BS + O2 ---> SO2
- CNeither is reduction.
- DBoth are reduction.
190Given H+ concentration = 7.2*10e-11 find PH?
- A10.14
- B14
- C7
- D5.4
191Which is more basic?
- A7
- B7.86
- C2
- D10
192Difference op-amp, given Vin = 1.2V what is Vout? Vo=(Vi2-Vi1)(Rf/Ri)
- A-17.56V
- B17.56V
- C8V
- D-8V
193Purpose of a flame detector in a burner?
- ATo give the flame profile.
- BTo detect incomplete combustion.
- CA & D
- DTo detect if the pilot goes out.
194Explosimeter prevents fire during operation by?
- AFlame Arrester.
- BReducting Foil.
- CFlashback arrestor.
- DNone of the above.
195Definition of Strauhal’s number? Or how does it relate to a Shedding Vortex Meter.
- AUsed to determine the size and number of vortices in a flow profile.
- BRelates vortices to velocity.
- C6.022×10^23 Is used to determine the relationship between vortices and mass flow.
- DNone of the above.
196Where is the control loop shield attached?
- AAt the instrument end only to prevent ground loops.
- BAt the source end only to prevent ground loops.
- CAt Both
- DTo an IS barrier.
197What are the benefits of a current limiting transmitter?
- AProtects all loop components.
- BLimits voltage to within operating tolerance.
- CMaintains loop resistance.
- DAll of the above
198Process is at 200Hz, When should we take a sample?
- A200Hz
- B400Hz
- C300Hz
- D600Hz
199Definition of CMRR in op-amps?
- ACommon mode rejection ratio - the ability to reject noise.
- BCommon meter rising resistance - the ability to modulate resistance based on the input current
- CCommon mode resistance ratio - the ratio of resistors to voltages.
- DNone of the above.
200What type of op-amps acts as if it has two gains?
- ADifference
- BIntegrating
- CPotentiometric
- DIdeal
Información
- Descripción
- Instrumentation 3rd Year Apprentice
- Autor
- Brennan Brow
- Idioma
- English
- Visitas
- 40
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test