Test
NCCER quiz 1-55
Preguntas del test (84)
1A 24VDC power supply is not working. With your multimeter you verify no DC voltage. On the 120VAC input you measure 120V between hot and ground, and 72V between hot and neutral. What is the most likely cause of this?
- ALost the ground
- BLost the hot
- CLost the neutral
- DLost the fuse
2Gain increase occurs when tube:
- ABack bends are made
- BBend radius increases
- CSize decreases
- DLong radius elbows are used
3A temperature measuring device that produces a voltage as the temperature changes is a/an:
- ARTD
- BThermistor
- CThermometer
- DThermocouple
4A pressure piping code is found in:
- AANSI B 31.1
- BNEC 690.
- COSHA1910.
- DISA S 5.1
5When marking tubing for cutting, the preferred method is to:
- AScribe a mark into the tube with a sharp object.
- BMark the tube with a grease pencil
- CMark the tube with a felt tip pen
- DMark the tube with a crayon
6An example of direct measurement indicator is a:
- APressure gauge
- BBulb thermometer
- CSight glass
- DFlowmeter
7In loop checks, all of the following are performed EXCEPT:
- AContinuity tests
- BProving
- CCalibrating
- DTuning
8If 75 volt DC potential is applied to a 25 ohm load, the circuit current is:
- A0.3 amps
- B3.0 amps
- C30 amps
- D300 milliamps
9A valve has linear-flow characteristics when the:
- AFlow corresponds directly to the valve stem position
- BDifferential pressure corresponds directly to the valve stem position
- CFlow is high enough to retract the valve stem
- DFlow does not pass through control loops
10What is a circuit current if 45 VDC is applied to a 250 ohm load?
- A0.18 amp
- B0.25 amp
- C0.50 amp
- D1.8 amp
1113. In the figure, how many CR1 contacts are there?
- A1
- B2
- C3
- D4
12All of the following valves are used to regulate flow EXCEPT:
- ABall
- BButterfly
- CNeedle
- DGate
13The value of the dynamic variable desired in a process is the:
- ASignal
- BSet point
- CResolution
- DSpecific gravity
14An acceptable tool for marking 360 degrees around the outside of tubing is a:
- ALaser level
- BRubber band
- CString
- DFerrule
15What process variable is defined as the amount of force exerted by a substance over a given unit of measure?
- AFlow
- BPressure
- CLevel
- DTemperature
16Storage of steel wool can be considered a fire hazard when stored around _____.
- AMatches
- BFlint
- CBatteries
- DGas cans
17The MINIMUM value of the measured process range is considered to be:
- AUpper measured value
- BZero input value
- CSpan value
- D3psi and 4ma
18A bubbler system is used to measure:
- ASpecific gravity
- BHead pressure
- CMagnetism
- DConductance
19What instrument drawing shows an actual representation of a process operating sequence?
- AOrthographic drawing
- BLocation drawing
- CIsometric drawing
- DP&ID
20To prevent travel damage to a limit switch, use a(n) _______.
- AMechanical stop
- BLarger switch
- CDifferent actuator arm
- DElectronic stop
21In a controller, automatic control describes:
- AThe final control element responding to the error signal or change in process
- BThe final control element as manipulated by the operator
- CThe final element as controlled by the setpoint of the controller locally
- DHow the controller receives its setpoint form a remote device
22When using soft rolled tubing, it must be unrolled and straightened:
- ABy use of rollers
- BBy using wooden mallets
- CBy hand
- DEnough to enter a compression fitting
23Where would an instrument fitter find the PROPER method to connect an instrument to a process tap?
- AIn a title block
- BOn a flow diagram
- CIn an instrument balloon
- DOn an installation detail
24The part of a control valve that controls the plug proportionally to the output of the controller is the:
- AHand wheel operator
- BValve positioner
- COperating spring
- DDiaphragm
25Workers should always assume that all electrical equipment and lines are _____.
- ADeenergized until proven
- BEnergized until proven
- CProven with a hot stick
- DProven by another employee
26The main function of a transducer is to:
- AConvert once signal form into another signal form
- BReduce primary voltage to low voltage
- CConvert motion to frequency
- DAmplify and retransmit an instrument signal
27What type of liquid is used for degreasing electronic equipment?
- AAcid Solvents
- BBasic Solvents
- CIsopropyl alcohol
- DWater
28The high pressure gas line has a large self-operated regulator. Inlet pressure is 300psi; Outlet pressure is 100psi. The regulator is sluggish during load changes. What is the first step to improve the operation of the regulator?
- ARepair the regulator
- BLower the inlet pressure
- CRaise the outlet pressure
- DReplace the regulator
29During acid cleaning a tubing run after installation it is very important to ______.
- APlace a basin at the end of the run
- BLeave all valves open throughout the run
- CVent high points
- DDrain low points
30On a field mounted controller, the setpoint is changed:
- AAutomatically
- BRemotely
- CBy the control room operator
- DManually
31When using a multimeter to drive loop current, the meter should be set to _____.
- AmA
- BDC Voltage
- COhms
- DOutput mA
32When the leads and selector switch are in the correct position why would a multimeter read voltage correctly but be unable to read milliamp current?
- AThe leads are reversed
- BThe leads are damaged
- CThe meter’s current fuse is blown
- DThe meter’s power fuse is blown
33When installing packing rings, how much should the cute ends be staggered?
- A0 Degrees
- B45 Degrees
- C90 Degrees
- D180 Degrees
34As a good rule of thumb, how much will ½” tubing gain for every 90-degree bend?
- A3/16 inch
- B¼ inch
- C3/8 inch
- D½ inch
35In the figure, how many CR1 contacts are there?
- A1
- B2
- C3
- D4
36When removing an instrument from receiving; what does NOT need to be checked?
- AInspect the instrument for damage
- BInspect the instrument for missing parts
- CCheck for the proper range and calibration
- DCheck the shipping date from the manufacturer
37Where are rubber gaskets used?
- AIn high pressure/low pressure systems
- BIn low pressure/low temperature systems
- CIn hot water/steam systems
- DIn low pressure/high temperature systems
38The purpose of an instrument index is to:
- AList every instrument used on a project
- BIllustrate the location of the instrument
- CShow how to install the instrument
- DList the manufacturer of the instrument
39What are the two types of material used for shielding?
- APlastic and rubber
- BFoil and braided
- CPaper and cloth
- DSolid and stranded
40An employee de-energizes a piece of equipment by removing the power plug from the outlet. If the employee continues to hold on to the power plug once removed, this employee is said to have what type of control over the energy potential?
- AIsolation control
- BLockout tagout
- CExclusive control
- DRemote control
41What does the term “fail open” mean in relation to valve actuators?
- ANormal position of the actuator is open
- BWhen the actuator power is lost, the valve will open
- CWhen the actuator power is lost, the valve will fail as is
- DNormal position of the actuator is closed
42An instrument fitter needs to withdraw 2 sticks of ½” Hastelloy “B” tubing from stores. It is not labeled and is mixed in with ½” 316 SS tubing that is also not labeled. What should be done?
- AHave procurement order some more from the supplier
- BReport the problem to the supervisor and have the tubing PMI’d
- CCompare wall thicknesses and use the one with the most wall thickness
- DPerform a hardness test on the tubing
43What (2) factors determine the static head pressure close to the bottom of a tank?
- AThe acidity or alkalinity of the liquid
- BThe height of the level and the turbidity
- CThe height of the level and the specific gravity
- DThe specific gravity and the viscosity
44A transmitter with an RTD is not working. Using the multimeter, which two parameters will help the best with troubleshooting?
- AAC Voltage and millivolts
- BDC Voltage and millivolts
- CAC voltage and resistance
- DDC voltage and resistance
45What part of an instrumentation installation drawing lists the REQUIRED fittings?
- AInstrument index
- BTitle block
- CMaterials list
- DLegend
46Solve using the equation: Absolute vacuum pressure = barometric pressure – vacuum gauge reading. Given that a vacuum gauge reads 22.2inHg, and the barometric pressure reads 27.68, find the absolute pressure.
- A5.48 in/Hg
- B14.7 in/Hg
- C29.85 in/Hg
- D49.88 in/Hg
47A severe shock is affected by:
- AAmount of current in body
- BSize of person
- CSize of wire
- DNumber of wires
48A float switch is used to control a sump pump. The pump motor continues to run after the sump pump is empty. What would cause the pump motor to continue running?
- AContacts are welded open
- BContacts are welded closed
- CThe pump suction line is plugged
- DThe supply voltage to the switch is too low
49The types of gaskets and gasket materials to be used on a project are listen in:
- AA section of the specifications
- BThe instrument index
- CA loop drawing
- DAn isometric drawing
50The preferred medium to remove debris from a new instrument air line prior to service is:
- AWater
- BAir
- CAlcohol
- DDilute Caustic
51A strain gauge measures the external force applied to a fine wire by causing a change in _____.
- ATemperature
- BResistance
- CCapacitance
- DInductance
52Which of the following purging gases should be avoided for use with hydrocarbons?
- AAir
- BNitrogen
- CCarbon dioxide
- DOxygen
53A differential pressure transmitter mounted on a non-vented vessel is used to measure the:
- ALevel of the product in the vessel
- BRate of flow of product out the vessel
- CDensity of the product in the vessel
- DRate of flow of product into the vessel
54Convert the length 2’ 10-3/4” to its decimal equivalent (in feet).
- A2.750’
- B2.896’
- C2.910’
- D2.950’
55Using the image, the valve shown is NOT:
- ASpring-to-open
- BAir-to-close
- CAir-to-open
- DFail open
56Flow can be described in units of all of the following EXCEPT:
- AVolume
- BDensity
- CMass
- Dvelocity
57When an 8mA signal is connected across a 250 ohm resistor, the voltage drop across the resistor would be:
- A1 volt
- B2 volts
- C3 volts
- D4 volts
58PTFE tape used as a sealant should be wrapped:
- AIn the same direction as the threads
- BIn the opposite direction of the threads
- CIn either direction
- D¼ inch past the threads
59What is a common material used to minimize moisture in the instrumentation?
- ADesiccant
- BSilica clay
- CCotton
- DWood shavings
60The pneumatic output of a 3-15 psi instrument is at 50%. The actual output in pressure is:
- A3 psi
- B6 psi
- C9 psi
- D15 psi
61The standards of which organization identify the characteristics of metals used for piping?
- AISA
- BASTM
- CNPS
- DAWWA
62The output of a thermocouple is expressed in:
- AVolts
- BMillivolts
- CMicrovolts
- DMilliamps
63MOST pneumatic receivers operate in the range of:
- A1-5 psi
- B0-10 psi
- C3-15 psi
- D0-100 psi
64The five-point method of calibration checks the device output at:
- A0%, 50%, 100%, 50%, 0%
- B4ma, 8ma, 12ma, and 20ma and back at 4ma
- CZero and 100% five times
- DA stimulated signal at 5 representative percentages.
65When pressure testing, the required documentation includes:
- ASpecification sheets
- BTroubleshooting flow charts
- CTemperature, pressure, and test medium
- DRequired corrective measures
66An air-to-open valve uses a:
- AFail-in-position actuator
- BSpring-to-open actuator
- CDual spring actuator
- DSpring-to-close actuator
67The MOST common method used to measure the flow of liquid in a pipe is to introduce a restriction In the pipe and measure the:
- AVelocity
- BPressure
- CDifferential pressure
- DViscosity
68What is the resistance in the circuit?
- A50 ohms
- B100 ohms
- C150 ohms
- D200 ohms
69After a bend is completed, all tubing will exhibit:
- AHardness
- BSpringback
- CBending errors
- DDiscoloration
70What valve REQUIRES a 90-degree turn to operate the valve 100% open or closed?
- AGlobe valve
- BCheck valve
- CGate valve
- DBall valve
71Where is the drain wire terminated in instrument system?
- AAt the conduit
- BAt the control cabinet
- CAt neither end
- DAt both ends
72On the image, how many hand valves are installed on Tank 1201C?
- A1
- B2
- C3
- D4
73What is the first step in troubleshooting a problem in a system?
- ATurn off power to the instrument
- BStimulate an input
- CVerify that there is a problem
- DStimulate an output
74Where can the appropriate elevation of an instrument be found?
- ALocation drawing
- BP&ID
- CFlow diagram
- DLoop drawing
75Chemical cleaning of tubing attached to instruments may cause damage to sensor ____.
- AElectronics
- BPaint
- CElements
- DBolts
76When making 90-degree tubing bend, allowance for springback should be:
- A6 to 8 degrees
- B4-5 degrees
- C1 to 3 degrees
- D0 degrees
77Cable shields should be connected to the:
- ASignal ground reference point
- BGround at each accessible location
- CFirst accessible grounding electrode
- DRaceway or cable tray in which the cable is routed
78Polarity of a diode is checked by selecting which of the following on the multi-meter?
- AmV
- BV
- COHMS
- DmA
79To accurately measure liquid level in a closed tank under pressure, use a:
- ABubble tube
- BDiaphragm box
- CFloat cable
- DDP transmitter
80OSHA requires that existing conditions be tested or inspected before beginning work on electrical equipment by using a(n) ________.
- AMultimeter
- BVoltage calibrator
- CMegger
- DAmp probe
81Weight is defined as:
- AThe amount of matter in an object
- BThe force exerted by a mass due to gravity
- CHow much mass a body has
- DThe rate at which a mass is accelerated
82Deadband in a switch refers to the:
- AA range of process change before switch actuation
- BRange of setpoint repeatability
- CAllowable overshoot of setpoint
- DRange of process change between actuation point and reset
83The adjustment that allows pressure contacts to reset is called the _______.
- AReset point
- BSet point
- CDeadband
- DOperating range
84The value of the dynamic variable desired in a process is the:
- ASignal
- BSet point
- CResolution
- DSpecific gravity
Información
- Descripción
- 1-55
- Autor
- Devan Romero
- Idioma
- English
- Visitas
- 169
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test