Studied by 41 people
When is the BEST time to document each loop check for commissioning?
A. Prior to the start of inspection
B. When all test and inspection activities are complete
C. When updating information on a daily basis
D. At the time each test is completed
D. At the time each test is completed
Teflon paste must not be used on:
A. Nitrogen service
B. Natural gas service
C. Water service
D. Oxygen service
A. Nitrogen service
A 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?
A. Lost the ground
B. Lost the hot
C. Lost the neutral
D. Lost the fuse
C. Lost the neutral
Gain increase when tube:
A. Back bends are made
B. Bend radius increases
C. Size decreases
D. Long radius elbows are used
A. Back bends are made
A temperature measuring device that produces a voltage as the temperature changes is a/an:
A. RTD
B. Thermistor
C. Thermometer
D. Thermocouple
D. Thermocouple
A pressure piping code is found in:
A. ANSI B 31.1
B. NEC 690.
C. OSHA1910.
D. ISA S 5.1
A. ANSI B 31.1
When marking tubing for cutting, the preferred method is to:
A. Scribe a mark into the tube with a sharp object.
B. Mark the tube with a grease pencil
C. Mark the tube with a felt tip pen
D. Mark the tube with a crayon
B. Mark the tube with a grease pencil
An example of direct measurement indicator is a:
A. Pressure gauge
B. Bulb thermometer
C. Sight glass
D. Flowmeter
A. Pressure gauge
In loop checks, all of the following are performed EXCEPT:
A. Continuity tests
B. Proving
C. Calibrating
D. Tuning
D. Tuning
If 75 volt DC potential is applied to a 25 ohm load, the circuit current is:
A. 0.3 amps
B. 3.0 amps
C. 30 amps
D. 300 milliamps
B. 3.0 amps
A valve has linear-flow characteristics when the:
A. Flow corresponds directly to the valve stem position
B. Differential pressure corresponds directly to the valve stem position
C. Flow is high enough to retract the valve stem
D. Flow does not pass through control loops
B. Differential pressure corresponds directly to the valve stem position
What is a circuit current if 45 VDC is applied to a 250 ohm load?
A. 0.18 amp
B. 0.25 amp
C. 0.50 amp
D. 1.8 amp
A. 0.18 amp
In the figure, how many CR1 contacts are there?
A. 1
B. 2
C. 3
D. 4
B. 2
All of the following valves are used to regulate flow EXCEPT:
A. Ball
B. Butterfly
C. Needle
D. Gate
D. Gate
The value of the dynamic variable desired in a process is the:
A. Signal
B. Set point
C. Resolution
D. Specific gravity
B. Set point
An acceptable tool for marking 360 degrees around the outside of tubing is a:
A. Laser level
B. Rubber band
C. String
D. Ferrule
D. Ferrule
What process variable is defined as the amount of force exerted by a substance over a given unit of measure?
A. Flow
B. Pressure
C. Level
D. Temperature
B. Pressure
Storage of steel wool can be considered a fire hazard when stored around _____.
A. Matches
B. Flint
C. Batteries
D. Gas cans
C. Batteries
The MINIMUM value of the measured process range is considered to be:
A. Upper measured value
B. Zero input value
C. Span value
D. 3psi and 4ma
D. 3psi and 4ma
A bubbler system is used to measure:
A. Specific gravity
B. Head pressure
C. Magnetism
D. Conductance
A. Specific gravity
To prevent travel damage to a limit switch, use a(n) _______.
A. Mechanical stop
B. Larger switch
C. Different actuator arm
D. Electronic stop
A. Mechanical stop
In a controller, automatic control describes:
A. The final control element responding to the error signal or change in process
B. The final control element as manipulated by the operator
C. The final element as controlled by the setpoint of the controller locally
D. How the controller receives its setpoint form a remote device
C. The final element as controlled by the setpoint of the controller locally
When using soft rolled tubing, it must be unrolled and straightened:
A. By use of rollers
B. By using wooden mallets
C. By hand
D. Enough to enter a compression fitting
C. By hand
Where would an instrument fitter find the PROPER method to connect an instrument to a process tap?
A. In a title block
B. On a flow diagram
C. In an instrument balloon
D. On an installation detail
D. On an installation detail
The part of a control valve that controls the plug proportionally to the output of the controller is the:
A. Hand wheel operator
B. Valve positioner
C. Operating spring
D. Diaphragm
B. Valve positioner
Workers should always assume that all electrical equipment and lines are _____.
A. Deenergized until proven
B. Energized until proven
C. Proven with a hot stick
D. Proven by another employee
B. Energized until proven
The main function of a transducer is to:
A. Convert once signal form into another signal form
B. Reduce primary voltage to low voltage
C. Convert motion to frequency
D. Amplify and retransmit an instrument signal
A. Convert once signal form into another signal form
What type of liquid is used for degreasing electronic equipment?
A. Acid Solvents
B. Basic Solvents
C. Isopropyl alcohol
D. Water
C. Isopropyl alcohol
The 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?
A. Repair the regulator
B. Lower the inlet pressure
C. Raise the outlet pressure
D. Replace the regulator
B. Lower the inlet pressure
During acid cleaning a tubing run after installation it is very important to ______.
A. Place a basin at the end of the run
B. Leave all valves open throughout the run
C. Vent high points
D. Drain low points
D. Drain low points
On a field mounted controller, the setpoint is changed:
A. Automatically
B. Remotely
C. By the control room operator
D. Manually
C. By the control room operator
When using a multimeter to drive loop current, the meter should be set to _____.
A. mA
B. DC Voltage
C. Ohms
D. Output mA
D. Output mA
When the leads and selector switch are in the correct position why would a multimeter read voltage correctly but be unable to read milliamp current?
A. The leads are reversed
B. The leads are damaged
C. The meter’s current fuse is blown
D. The meter’s power fuse is blown
C. The meter’s current fuse is blown
When installing packing rings, how much should the cute ends be staggered?
A. 0 Degrees
B. 45 Degrees
C. 90 Degrees
D. 180 Degrees
C. 90 Degrees
As a good rule of thumb, how much will ½” tubing gain for every 90-degree bend?
A. 3/16 inch
B. ¼ inch
C. 3/8 inch
D. ½”
A. 3/16 inch
When removing an instrument from receiving; what does NOT need to be checked?
A. Inspect the instrument for damage
B. Inspect the instrument for missing parts
C. Check for the proper range and calibration
D. Check the shipping date from the manufacturer
D. Check the shipping date from the manufacturer
Where are rubber gaskets used?
A. In high pressure/low pressure systems
B. In low pressure/low temperature systems
C. In hot water/steam systems
D. In low pressure/high temperature systems
B. In low pressure/low temperature systems
The purpose of an instrument index is to:
A. List every instrument used on a project
B. Illustrate the location of the instrument
C. Show how to install the instrument
D. List the manufacturer of the instrument
A. List every instrument used on a project
What are the two types of material used for shielding?
A. Plastic and rubber
B. Foil and braided
C. Paper and cloth
D. Solid and stranded
B. Foil and braided
An 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?
A. Isolation control
B. Lockout tagout
C. Exclusive control
D. Remote control
A. Isolation control
What does the term “fail open” mean in relation to valve actuators?
A. Normal position of the actuator is open
B. When the actuator power is lost, the valve will open
C. When the actuator power is lost, the valve will fail as is
D. Normal position of the actuator is closed
B. When the actuator power is lost, the valve will open
An 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?
A. Have procurement order some more from the supplier
B. Report the problem to the supervisor and have the tubing PMI’d
C. Compare wall thicknesses and use the one with the most wall thickness
D. Perform a hardness test on the tubing
B. Report the problem to the supervisor and have the tubing PMI’d
What (2) factors determine the static head pressure close to the bottom of a tank?
A. The acidity or alkalinity of the liquid
B. The height of the level and the turbidity
C. The height of the level and the specific gravity
D. The specific gravity and the viscosity
C. The height of the level and the specific gravity
A transmitter with an RTD is not working. Using the multimeter, which two parameters will help the best with troubleshooting?
A. AC Voltage and millivolts
B. DC Voltage and millivolts
C. AC voltage and resistance
D. DC voltage and resistance
D. DC voltage and resistance
What part of an instrumentation installation drawing lists the REQUIRED fittings?
A. Instrument index
B. Title block
C. Materials list
D. Legend
C. Materials list
Solve 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.
A. 5.48 in/Hg
B. 14.7 in/Hg
C. 29.85 in/Hg
D. 49.88 in/Hg
A. 5.48 in/Hg
A severe shock is affected by:
A. Amount of current in body
B. Size of person
C. Size of wire
D. Number of wires
A. Amount of current in body
A 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?
A. Contacts are welded open
B. Contacts are welded closed
C. The pump suction line is plugged
D. The supply voltage to the switch is too low
B. Contacts are welded closed
The types of gaskets and gasket materials to be used on a project are listen in:
A. A section of the specifications
B. The instrument index
C. A loop drawing
D. An isometric drawing
A. A section of the specifications
The preferred medium to remove debris from a new instrument air line prior to service is:
A. Water
B. Air
C. Alcohol
D. Dilute Caustic
B. Air
A strain gauge measures the external force applied to a fine wire by causing a change in _____.
A. Temperature
B. Resistance
C. Capacitance
D. Inductance
B. Resistance
Which of the following purging gases should be avoided for use with hydrocarbons?
A. Air
B. Nitrogen
C. Carbon dioxide
D. Oxygen
A. Air
A differential pressure transmitter mounted on a non-vented vessel is used to measure the:
A. Level of the product in the vessel
B. Rate of flow of product out the vessel
C. Density of the product in the vessel
D. Rate of flow of product into the vessel
C. Density of the product in the vessel
Convert the length 2’ 10-3/4” to its decimal equivalent (in feet).
A. 2.750’
B. 2.896’
C. 2.910’
D. 2.950’
B. 2.896’
Using the image, the valve shown is NOT:
A. Spring-to-open
B. Air-to-close
C. Air-to-open
D. Fail open
C. Air-to-open
Flow can be described in units of all of the following EXCEPT:
A. Volume
B. Density
C. Mass
D. velocity
B. Density
When an 8mA signal is connected across a 250 ohm resistor, the voltage drop across the resistor would be:
A. 1 volt
B. 2 volts
C. 3 volts
D. 4 volts
B. 2 volts
PTFE tape used as a sealant should be wrapped:
A. In the same direction as the threads
B. In the opposite direction of the threads
C. In either direction
D. ¼ inch past the threads
A. In the same direction as the threads
What is a common material used to minimize moisture in the instrumentation?
A. Desiccant
B. Silica clay
C. Cottom
D. Wood shavings
A. Desiccant
The pneumatic output of a 3-15 psi instrument is at 50%. The actual output in pressure is:
A. 3 psi
B. 6 psi
C. 9 psi
D. 15 psi
C. 9 psi
The standards of which organization identify the characteristics of metals used for piping?
A. ISA
B. ASTM
C. NPS
D. AWWA
B. ASTM
The output of a thermocouple is expressed in:
A. Volts
B. Millivolts
C. Microvolts
D. Milliamps
B. Millivolts
MOST pneumatic receivers operate in the range of:
A. 1-5 psi
B. 0-10 psi
C. 3-15 psi
D. 0-100 psi
C. 3-15 psi
The five-point method of calibration checks the device output at:
A. 0%, 50%, 100%, 50%, 0%
B. 4ma, 8ma, 12ma, and 20ma and back at 4ma
C. Zero and 100% five times
D. A stimulated signal at 5 representative percentages.
B. 4ma, 8ma, 12ma, and 20ma and back at 4ma
When pressure testing, the required documentation includes:
A. Specification sheets
B. Troubleshooting flow charts
C. Temperature, pressure, and test medium
D. Required corrective measures
A. Specification sheets
An air-to-open valve uses a:
A. Fail-in-position actuator
B. Spring-to-open actuator
C. Dual spring actuator
D. Spring-to-close actuator
A. Fail-in-position actuator
The MOST common method used to measure the flow of liquid in a pipe is to introduce a restriction In the pipe and measure the:
A. Velocity
B. Pressure
C. Differential pressure
D. Viscosity
A. Velocity
What is the resistance in the circuit?
A. 50 ohms
B. 100 ohms
C. 150 ohms
D. 200 ohms
D. 200 ohms
After a bend is completed, all tubing will exhibit:
A. Hardness
B. Springback
C. Bending errors
D. Discoloration
B. Springback
What valve REQUIRES a 90-degree turn to operate the valve 100% open or closed?
A. Globe valve
B. Check valve
C. Gate valve
D. Ball valve
D. Ball valve
Where is the drain wire terminated in instrument system?
A. At the conduit
B. At the control cabinet
C. At neither end
D. At both ends
B. At the control cabinet
On the image, how many hand valves are installed on Tank 1201C?
A. 1
B. 2
C. 3
D. 4
C. 3
What is the first step in troubleshooting a problem in a system?
A. Turn off power to the instrument
B. Stimulate an input
C. Verify that there is a problem
D. Stimulate an output
C. Verify that there is a problem
Where can the appropriate elevation of an instrument be found?
A. Location drawing
B. P&ID
C. Flow diagram
D. Loop drawing
B. P&ID
Chemical cleaning of tubing attached to instruments may cause damage to sensor ____.
A. Electronics
B. Paint
C. Elements
D. Bolts
C. Elements
When making 90-degree tubing bend, allowance for springback should be:
A. 6 to 8 degrees
B. 4-5 degrees
C. 1 to 3 degrees
D. 0 degrees
C. 1 to 3 degrees
Cable shields should be connected to the:
A. Signal ground reference point
B. Ground at each accessible location
C. First accessible grounding electrode
D. Raceway or cable tray in which the cable is routed
B. Ground at each accessible location
Polarity of a diode is checked by selecting which of the following on the multi-meter?
A. mV
B. V
C. OHMS
D. mA
C. OHMS
To accurately measure liquid level in a closed tank under pressure, use a:
A. Bubble tube
B. Diaphragm box
C. Float cable
D. DP transmitter
D. DP transmitter
OSHA requires that existing conditions be tested or inspected before beginning work on electrical equipment by using a(n) ________.
A. Multimeter
B. Voltage calibrator
C. Megger
D. Amp probe
A. Multimeter
Weight is defined as:
A. The amount of matter in an object
B. The force exerted by a mass due to gravity
C. How much mass a body has
D. The rate at which a mass is accelerated
B. The force exerted by a mass due to gravity
Deadband in a switch refers to the:
A. A range of process change before switch actuation
B. Range of setpoint repeatability
C. Allowable overshoot of setpoint
D. Range of process change between actuation point and reset
A. A range of process change before switch actuation
The adjustment that allows pressure contacts to reset is called the _______.
A. Set point
B. Reset point
C. Deadband
D. Operating range
B. Reset point
The value of the dynamic variable desired in a process is the:
A. Signal
B. Set point
C. Resolution
D. Specific gravity
B. Set point
A nuclear measuring device is typically used to measure:
A. Level
B. Temperature
C. Pressure
D. pH
A. Level
What does a solenoid valve do?
A. Opens and closes switches
B. Serves as an actuator to open and close pneumatic and hydraulic valves
C. Transforms volts to millivolts
D. Actuates to open and close terminal blocks
B. Serves as an actuator to open and close pneumatic and hydraulic valves
What is the psi reading on MOST gauge pressure indicators at atmospheric pressure?
A. 100
B. 10
C. Zero
D. Below zero
C. Zero
Proportional control is also known as:
A. Derivative control
B. Reset control
C. Gain control
D. On-off control
A. Derivative control
The documentation required to loop check and commission are:
A. P&ID, loop diagrams, and instrument specification sheets
B. P&ID and electrical drawings
C. Electrical drawings and typical installations detail sheets
D. Logic diagrams, loop sheets, and instrument operation manuals
A. P&ID, loop diagrams, and instrument specification sheets
In an instrument loop, where would wet instrument air show up first?
A. In the air piping
B. At the dryer
C. In the filter regulator
D. At the valve positioner
B. At the dryer
What is the total current of the circuit?
A. 0.48 amps
B. 0.24 amps
C. 0.20 amps
D. 0.12 amps
D. 0.12 amps
Bills of materials are found in:
A. General arrangement drawings
B. Instrument detail drawings
C. Piping orthographics
D. P&ID
A. General arrangement drawings
Signal cable shields should be connected to ground at:
A. 1 point in the signal path
B. Each accessible point in the signal path
C. Each end of the signal path
D. Each junction point in the signal path
A. 1 point in the signal path
Where would an instrument fitter find a P&ID number for a particular instrument
A. In the instrument installation details
B. On pipe drawings
C. In an instrument index
D. On the instrument location drawing
C. In an instrument index
To measure level, which variable is critical for accurate measurement?
A. Specific gravity
B. Pressure
C. Temperature
D. Flow
A. Specific gravity
The ASTM factors affection required wall thickness of tubing include all of the following EXCEPT:
A. Working pressure
B. Working temperature
C. Support type
D. Material type
C. Support type
What instrument drawing shows an actual representation of a process operating sequence?
A. Orthographic drawing
B. Location drawing
C. Isometric drawing
D. P&ID
D. P&ID
What is the total circuit current?
A. 0.096 amps
B. 0.24 amps
C. 0.48 amps
D. 0.960 amps
A. 0.096 amps
The three basic types of fluid flow are laminar flow, turbulent flow, and:
A. Transitional flow
B. Velocity flow
C. Differential flow
D. Volumetric flow
A. Transitional flow
When calibrating a loop pressure instrument during loop checks, the source of pressure is the:
A. Process fluid
B. Hydrostatic test pressure
C. Absolute pressure
D. Pressure calibrator
D. Pressure calibrator
Note 
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