Instrument Technician

1. 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

2. Teflon paste must not be used on:

A. Nitrogen service
B. Natural gas service
C. Water service
D. Oxygen service

3. 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

4. Gain increase when tube:

A. Back bends are made
B. Bend radius increases
C. Size decreases
D. Long radius elbows are used

5. A temperature measuring device that produces a voltage as the temperature changes is a/an:
A. RTD
B. Thermistor
C. Thermometer
D. Thermocouple

6. A pressure piping code is found in:

A. ANSI B 31.1
B. NEC 690.
C. OSHA1910.
D. ISA S 5.1

7. 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

8. An example of direct measurement indicator is a:

A. Pressure gauge
B. Bulb thermometer
C. Sight glass
D. Flowmeter
9. In loop checks, all of the following are performed EXCEPT:
A. Continuity tests
B. Proving
C. Calibrating
D. Tuning

10. 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

11. 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

12. 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

13. In the figure, how many CR1 contacts are there?

A. 1
B. 2
C. 3
D. 4

14. All of the following valves are used to regulate flow EXCEPT:
A. Ball
B. Butterfly
C. Needle
D. Gate

15. The value of the dynamic variable desired in a process is the:

A. Signal
B. Set point
C. Resolution
D. Specific gravity
16. An acceptable tool for marking 360 degrees around the outside of tubing is a:
A. Laser level
B. Rubber band
C. String
D. Ferrule
17. 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

18. Storage of steel wool can be considered a fire hazard when stored around _____.
A. Matches
B. Flint
C. Batteries
D. Gas cans

19. 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

20. A bubbler system is used to measure:

A. Specific gravity
B. Head pressure
C. Magnetism
D. Conductance

21. To prevent travel damage to a limit switch, use a(n) _______.

A. Mechanical stop
B. Larger switch
C. Different actuator arm
D. Electronic stop

22. 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

23. 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

24. 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
25. 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

26. 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

27. 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

28. What type of liquid is used for degreasing electronic equipment?

A. Acid Solvents
B. Basic Solvents
C. Isopropyl alcohol
D. Water

29. 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

30. 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

31. On a field mounted controller, the setpoint is changed:

A. Automatically
B. Remotely
C. By the control room operator
D. Manually

32. When using a multimeter to drive loop current, the meter should be set to _____.
A. mA
B. DC Voltage
C. Ohms
D. Output mA
33. 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

34. When installing packing rings, how much should the cute ends be staggered?
A. 0 Degrees
B. 45 Degrees
C. 90 Degrees
D. 180 Degrees

35. 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”

36. 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

37. 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

38. 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

39. 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

40. 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
41. 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

42. 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

43. 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

44. 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

45. What part of an instrumentation installation drawing lists the REQUIRED fittings?
A. Instrument index
B. Title block
C. Materials list
D. Legend

46. 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

47. A severe shock is affected by:

A. Amount of current in body
B. Size of person
C. Size of wire
D. Number of wires

48. 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
49. 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

50. 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

51. 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

52. Which of the following purging gases should be avoided for use with hydrocarbons?
A. Air
B. Nitrogen
C. Carbon dioxide
D. Oxygen

53. 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

54. 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’

55. Using the image, the valve shown is NOT:

A. Spring-to-open
B. Air-to-close
C. Air-to-open
D. Fail open

56. Flow can be described in units of all of the following EXCEPT:

A. Volume
B. Density
C. Mass
D. velocity
57. 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

58. 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

59. What is a common material used to minimize moisture in the instrumentation?

A. Desiccant
B. Silica clay
C. Cottom
D. Wood shavings

60. 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

61. The standards of which organization identify the characteristics of metals used for piping?
A. ISA
B. ASTM
C. NPS
D. AWWA

62. The output of a thermocouple is expressed in:

A. Volts
B. Millivolts
C. Microvolts
D. Milliamps

63. MOST pneumatic receivers operate in the range of:

A. 1-5 psi
B. 0-10 psi
C. 3-15 psi
D. 0-100 psi

64. 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.
65. When pressure testing, the required documentation includes:
A. Specification sheets
B. Troubleshooting flow charts
C. Temperature, pressure, and test medium
D. Required corrective measures

66. 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

67. 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

68. What is the resistance in the circuit?

A. 50 ohms
B. 100 ohms
C. 150 ohms
D. 200 ohms

69. After a bend is completed, all tubing will exhibit:

A. Hardness
B. Springback
C. Bending errors
D. Discoloration

70. 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

71. 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
72. On the image, how many hand valves are installed on Tank 1201C?
A. 1
B. 2
C. 3
D. 4

73. 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

74. Where can the appropriate elevation of an instrument be found?

A. Location drawing
B. P&ID
C. Flow diagram
D. Loop drawing

75. Chemical cleaning of tubing attached to instruments may cause damage to sensor ____.
A. Electronics
B. Paint
C. Elements
D. Bolts

76. 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

77. 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
78. Polarity of a diode is checked by selecting which of the following on the multi-meter?
A. mV
B. V
C. OHMS
D. mA

79. 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

80. 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

81. 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

82. 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

83. The adjustment that allows pressure contacts to reset is called the _______.
A. Set point
B. Reset point
C. Deadband
D. Operating range

84. The value of the dynamic variable desired in a process is the:

A. Signal
B. Set point
C. Resolution
D. Specific gravity

85. A nuclear measuring device is typically used to measure:

A. Level
B. Temperature
C. Pressure
D. pH
86. 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

87. What is the psi reading on MOST gauge pressure indicators at atmospheric pressure?
A. 100
B. 10
C. Zero
D. Below zero

88. Proportional control is also known as:

A. Derivative control
B. Reset control
C. Gain control
D. On-off control

89. 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

90. 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

91. What is the total current of the circuit?

A. 0.48 amps
B. 0.24 amps
C. 0.20 amps
D. 0.12 amps

92. Bills of materials are found in:

A. General arrangement drawings
B. Instrument detail drawings
C. Piping orthographics
D. P&ID

93. 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
94. 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

95. To measure level, which variable is critical for accurate measurement?

A. Specific gravity
B. Pressure
C. Temperature
D. Flow

96. 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

97. What instrument drawing shows an actual representation of a process operating sequence?
A. Orthographic drawing
B. Location drawing
C. Isometric drawing
D. P&ID

98. What is the total circuit current?

A. 0.096 amps
B. 0.24 amps
C. 0.48 amps
D. 0.960 amps

99. 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

100.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

101. A particulate filter is working properly, but light oil/water residue is showing up in the air. What should be done
to correct this problem?
A. Replace the particulate filter
B. Add a coalescing filter
C. Replace the air line
D. Add a second particulate filter
102.Loop testing involves simulation of the:
A. Component settings
B. Zero and span
C. Corrective measures
D. Process variable

103.What is indicated by a double solid line drawn though the instrument symbol?
A. The instrument is in a primary location
B. The instrument is mounted in an auxiliary location
C. The instrument is field-mounted near the point of measurement
D. The instrument accepts a digital input signal

104.What causes the valve stem solenoid vale to move up or down?

A. Magnetic field induced by an electrical coil that surrounds the stem
B. Process pressure in the “P” port
C. Permanent magnet located in the upper portion of the housing
D. Pressure of the fluid passing through a valve

105.A decreasing output with increasing input describes:

A. A direct action
B. Nozzle equilibrium
C. Reverse action
D. Feedback axis?

106.What valve or pump packing material that is used where caustics, mild acids, gases, and chemicals are present?
A. Buna N
B. PTFE/Synthetic fiber
C. Lubricated graphite yarn
D. Lubricated carbon yarn

107. A displacer level instrument is withdrawn from stores and handed over to pipefitters for installation. After it is
installed, the technician goes to perform the instrument checkout. The technician is not able to get the displacer
to respond. What troubleshooting step should be performed first?
A. Ask the pipefitters if the displacer was dropped during installation
B. Call the manufacture help line for assistance
C. Make sure to displacer is mounted correctly
D. Check and see if the mechanical stops installed for shipping were removed

108.The nominal size of tubing is determined by its:

A. ID
B. Wall thickness
C. Circumference
D. OD

109.When selecting a regulator, choose the:

A. Larger range spring if two springs have the desired pressure setting
B. Regulator body size that is larger than pipe size
C. Overpressure protection that protects the regulator
D. Largest port diameter that will handle flow
110.How many ¾” valves are on the figure provided?
A. 2
B. 3
C. 4
D. 5

111. Thread compound which is normally applied using a brush is called:

A. A plumbing putty
B. PTFE Tape
C. Pipe dope
D. Pipe chalk

112. The process parameter that is selected for control is the

A. Process rate
B. Controlled energy
C. Process setpoint
D. Controlled variable

113. Which of the following is a basic principle of alternating current flowing in a conductor
A. The current flow is in one direction
B. The magnetic field is stationary
C. The magnetic field is moving
D. The current will not produce a magnetic field

114. Shielding of signal cable is an effective method to

A. Eliminate capacitive coupling
B. Minimize EMI
C. Protect in a high temperature environment
D. Eliminate the need for grounding

115. In reference to PID controllers reset relates to:

A. How to restart the controller
B. the rate of change of the error signal
C. the amount of change in the error signal
D. the integral of change in the error signal
116. If the proportional band of a controller is adjusted to the minimum position valve the controller action is
likely to be
A. On/off
B. variable operation
C. excellent
D. inoperative

117. Valves are used to control all of the following except

A. volume or amount of flow
B. flow of impurities
C. direction of flow
D. system pressure

118. the term “fail open” and “fail closed” are used to describe what valve component
A. Plug
B. Seat
C. Spring
D. Hand wheel

119. During pneumatic testing what is used to identify the pressure leak
A. Hydrostatic
B. soapy water
C. shaving cream
D. Audio DB meter

120. A transmitter is not working correctly with a multimeter you check across the positive and negative
terminals what is the next step
A. Change the transmitter
B. add a 250 ohms resistor
C. get in series with the loop
D. check the power supply for issues

121. A disadvantage of direct operated regulators is

A. they're large physical size
B. they can only be used in gas service
C. their poor sensitivity
D. that they need external connections

122. for most tube Bender radius blocks a 90 degree bend gains approximately
A. 1 tube diameter
B. 1 1/2 tube diameter
C. 2 tube diameters
D. 2 1/2 tube diameters
123. Oil based pipe joint compound should never be used on threads of pipe used to Coney oxygen because
A. will not mix
B. in contact could explode
C. together produce unpleasant odors
D. in a mix could plug the pipe

124. Which of the following is not the type of lead line materials used on tubing and transmitters
A. copper tubing
B. stainless steel
C. Monel
D. Hastelloy

125. What information does a P&ID provide

A. Shows instrument locations as it relates to the process
B. provide uniform guidelines for connections and instrumentation
C. shows actual equipment locations within the structure
D. shows instrument elevation

126. A technician is using an instrument tag number to withdraw an instrument from stores the technician is
not sure if the hardware being pulled which document should the technician reference to ensure that the
correct is withdrawn
A. Bill of lading
B. instrumentation data sheet and PO
C. shipping papers
D. supplier document specification sheet

127. What does a pneumatic valve positioner do

A. provides direct control of plant air regulator
B. adjust position of heat tracing element
C. controls the opening of a valve transducer
D. controls the operation of a valve actuator

128. 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

129. Where should a d flow transmitter high pressure side be connected to the orphis taps
A. upstream
B. downstream
C. top
D. bottom
 130. old packing should be replaced with a new packing which is
A. one size larger
B. one size smaller
C. in kind
D. softer material

131. Measurements are always taken from the tubing centerline except for the
A. first bend
B. second bend
C. third bend
D. last bend

132. What will happen in a series circuit with four lights if anyone burns out
A. the 3 remaining lights will stay on
B. half of the lights will remain on
C. all the lights will be out
D. circuit current will spike high

133. convert 87.6 Celsius to Fahrenheit

48.67
80.66
157.58
189.58

133. What is a diode

A. electronic device that allows current to flow in only One Direction
B. Electric element used to store a charge temporarily
C. Not metallic materials used in semiconductor devices
D. complementary metal oxide semiconductor

134. The primary goal for any closed loop control system is
A. Stability
B. Proportion
C. positive feedback
D. negative feedback

135. Gaskets are usually specified for particular range of

A. Temperature and pressure
B. flow rate and temperature
C. pressure and level
D. temperature and level
136. Multiple instruments within a loop share a common
A. Loop prefix
B. Loop suffix
C. Installation detail
D. Loop number

137. Pressure is expressed mathematically as

A. P = A/F
B. P = H /V
C. P = F /H
D. P = F /A

138. What does the reset control mode eliminate

A. circuit overload
B. circuit underload
C. offset*
D. overflow

139. Proving a loop is a

A. physical inspection of all of the components
B. simulating test run
C. point to point interconnection
D. revising the loop documents as built

140. What is the major cause of death from electrical shock

A. Burns
B. heart fibrillation
C. head trauma
D. arc flash

141. Water in an air system causes all of the following except

A. Formation of rust and scale
B. Freezing in lines exposed to cold weather
C. Mal of control instrument
D. Pressure fluctuations in process

142. An RTD is used to measure

A. Small pressure change
B. Vacuum
C. Density
D. Temperature
143. A 4 wire 100 ohm PT RTD is being checked at 32 F what resistance should be expected between the
red and white wire
A. 0 ohms
B. 100 ohms
C. 108 ohms
D. 120 ohms

144. The simplest liquid level measurement device is a

A. Float
B. Sight glass
C. Bubbler system
D. Differential pressure system

145. An analog instrument has been determined to have excessive noise on th signal in troubleshooting the
problem what would a technician look for
A. The instrument is located in an extremely hot area
B. The instrument is getting moisture inside the housing
C. The insulation is damaged on the signal wires
D. The installation meets the NEC code regulations

146. When inspecting a regulator controlled nitrogen pad system on a large storage tank and no pressure is
found what critical item besides the regulator should be checked
A. Supply pressure
B. The tank lid
C. Level transmitter
D. Pump strainer

147. What can happen if an instrument is getting too much EMI noise
A. It can lead to instrument inaccuracy
B. It can lead to instrument damage
C. It can blow a fuse
D. It can short capacitor

148. The accuracy of a type J T/C is being questioned what setting on a multimeter will best troubleshoot the
issue
A. Resistance
B. Millivolts
C. AC voltage
D. DC voltage
149. A worker knows the tag number of an instrument and needs to identify the drawing and documents
relating to the particular instrument which of the following would be the best place to find the information
A. P&ID drawing
B. Installation detailed drawings
C. Instrument index
D. Flow sheet

150. When properly calibrated and installed the most accurate primary flow element is the
A. Venturi tube
B. Pitot tube
C. Annubar tube
D. Magmeter

151. What type of input signal does a valve actuator receive from a 4 to 20ma transducer
A. Pneumatic
B. Current
C. Digital
D. Millivolts

152. A substance that is capable of reducing friction heat and wear when applied as a film between two
surfaces is
A. Sealant
B. Lubricant
C. Solvent
D. Coolant

153. When deburring tubing which of the following should be avoided

A. Removing internal burrs
B. Removing razor edges
C. Tapering the internal diameter
D. Filing external burrs

154. Any person working near equipment during lockout tagout conditions is considered an
A. Authorized employee
B. Affected employee
C. Authorized observer
D. Affected supervisor

155. One PSI is equal to how many inches of water

A. 2.036
B. 6.104
C. 27.73
D. 31
156. 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

157. What does a P&ID provide

A. The instruments location as they relate to the process
B. Uniform guideline for connection of instrumentation
C. Actual equipment location within the structure
D. Information about the process operating requirements

158. nuclear level detectors are used when

A. traditional level sensors present a risk to life or the environment
B. there are space consumption in the instruments
C. power consumption in the plant is an issue
D. the process produces dust and vapors

159. What does a venturi Tube measure

A. Process pressure
B. Noise level
C. Temperature gradient
D. Process flow

160. Convert 72 degrees F to Celsius

A. 129.6 C
B. 40.1 C
C. 22.2 C
D. 19.4 C

161. For a 45 degree tubing bend the bend mark must be aligned with what mark on the slide block at the
beginning of the bend
A. O
B. L
C. R
D. 45

162. The range of the transmitter is the

A. Maximum output valve
B. Minimum operating limit
C. Difference between upper and lower limits
D. Inches of H2o measured
163. What is the major cause of death from electrical shock
A. Burns
B. Heart fibrillation
C. Head trauma
D. Arc flash

164. 27.7 inches of H20 is equivalent to

A. 9psi
B. 6psi
C. 3psi
D. 1psi

165. Thread compound which is normally applied using a brush is called

A. Plumbing putty
B. PFTE tape
C. Pipe dope
D. Pipe chalk

166. Connecting tubing into a junction box requires

A. Oversized holes
B. Bulkhead fittings ‘
C. tubing unions
D. Internal clamps

167. When receiving instruments for the first time you should
A. Ask your supervisor to store them
B. File all documents in a file cabinet
C. Inspect instrument for damage
D. Send them to the instrument shop for calibration

168. For a 180- degree tubing bend the zero on the forming wheel of the bender must be aligned with what
number on the slide block at the beginning of the bend
A. 0
B. 45
C. 90
D. 180

169. When commissioning a loop

A. Control of the process fluid is verified
B. The process is pressure tested and turned
C. Both the physical installation and system functions are checked
D. Instruments are calibrated

170. Pressure switches are actuated by

A. High pressure adjustment screws
B. Bellow diaphragms or bourdon tubes
C. Low pressure dead band adjustments
D. Normally open or normally closed contacts
171. In a non linear power supply the dc output voltage is regulated by
A. TDR
B. Capacitor
C. Resistor
D. SCR

172. The most common standard set symbols for instrumentation is from
A. NIST
B. ISA
C. API
D. NEC

173. The final step in commissioning should be

A. Proving the loop
B. Calibrating the loop
C. Troubleshooting the loop
D. Recording the documents

174. When an I to P transducer is used on a pneumatic control valve that is set up to fail closed a signal input
of 4mA from the control room will
A. Open the control valve
B. Result in an air pressure of 3 psi which will close the control valve
C. Result in an air pressure of 15 psi which will open the control valve
D. Keep the control valve in its current position

175. When simulating a turbine sensing element during calibration of a flowmeter the instrument technician
might use
A. A pulse source and milliamp meter
B. An oscilloscope and a voltmeter
C. A venturi tube and ohmmeter
D. An annubar and voltmeter

176. RTD elements are normally constructed of

A. Aluminum silver or iron
B. Platinum copper or nickel
C. Gold bronze or lead
D. Zinc cobalt or rhodium

177. The final step in commissioning is

A. Assembling drawing documents and test records
B. Verifying correct operation of safety devices
C. Pressure testing loop
D. Performing electrical test
178. What device is used to measure flow?
A. Bourdon Tube
B. Venturi Tube
C. Sight Glass
D. Pressure Gauge

179. An orifice plate causes a pressure drop which can be measured to calculate
A. Pressure
B. Flow
C. Temperature
D. Detector

180. Where should a DP flow transmitters high pressure side be connected to the orifice tape
A. Upstream
B. Downstream
C. Top
D. Bottom

181. When replacing a control valve in kind what is least important

A. Location of signal ports
B. Flange to flange dimension
C. Failure mode
D. Valve type

182. The most frequent control mode is

A. Remote
B. Local
C. Automatic
D. Manual

183. Cleaning of piping and tubing is generally required after all of the following EXCEPT
A. Shipping
B. Manufacturing
C. Construction
D. Modification

184. The set point on a controller is a specific valve at which

A. The system is initially calibrated but not maintained
B. The system shuts down
C. A process variable is to be maintained
D. The system begins operating
185. Electronic instrument signal leads can be influenced by
A. Repeatability
B. Span
C. Elevation
D. Noise

186. In proving and calibrating a loop, equipment is required to:

A. Receive an output signals
B. record data digitally
C. be corrosion resistant
D. measure process signals

187. Smart instrument transmission required which of the following for calibration and configuration
A. Manometer
B. Communicator
C. Oscilloscope
D. Volt ohm meter

188. A reverse acting positioner

A. opens a control valve as a control signal increases
B. closes the control valve as the control signal increases
C. closes a control valve as the signal decreases
D. only indicates valve position

189. Which of these values is measured in a circuit de-energized

A. Voltage
B. Resistance
C. Current
D. Power

190. Where can the degree of slope on a tubing run be found

A. location drawings
B. loop sheet
C. isometric drawings
D. Installation drawings

191. And a controller automatic control describes

A. the final control element responding to an error signal or change in process
B. the final control element as manipulated by an operator
C. the final element as controlled by a step point of the controller locally
D. how the controller receives its setpoint from a remote
 192. Which of the following should not be considered when cleaning instruments
A. area ventilation
B. ignition source
C. cleaning frequency
D. solvent compatibility

193. Most smart transmitters

A. use HART protocol communication
B. are analog
C. Are voice activated
D. have an air supply

194. Tube gain is due to the fact that

A. tubing expands when temperatures change
B. tubing takes a shortcut through the radius of the bend
C. shipping contracts when temperatures change
D. tubing changes ID when bending occurs

195. the following are proper and safe methods for storing tubing except
A. Rigid tubing should be stored on tube racks
B. the ends of tubing should be sealed
C. tubing should be left uncovered
D. Poly tubing should be stored out of sunlight

196. fluid is flowing through the hole in end orifice plate what does the restricted fluid movement caused by
size of the
A. A slower flow
B. the difference in pressure
C. and alternate flow for the control panel
D. stress on the instrument

197.troubleshooting starts with

A. pulling the loop files
B. identifying the cause
C. locating the problem
D. verifying that a problem exists

197. convert 87.6 Celsius to Fahrenheit

A. 48.67
B. 80.66
C. 157.58
D. 189.58
198. In a cascade control loop what does a primary control loop determine for the secondary control loop
A. Deviation
B. Feedback
C. Ratio
D. Setpoint

199. Which wire brush is the best brush for stainless steel materials
A. Brass
B. Carbon
C. Nylon
D. stainless steel

200. Instrument loop where would wet instrument air show up first
A. In the air piping
B. at the dryer
C. in the fitting regulator
D. at the valve positioner

201. What document should be checked to verify that the correct instrument is being used for a particular job
A. packing slip
B. Loop drawing
C. bill of material
D. instrument data sheet

202. how many inches of WC are in 3 psig

A. 40.68 WC
B. 44.1 WC
C. 62.4 WC
D. 83.04 WC

203. what organization issues the guidelines used for lockout procedures
A. ASME
B. OSHA
C. NFPA
D. NEC

204. What is the purpose of I/P in a control loop

A. Indicates the actual position of the control valve
B. convert the controllers electrical signal to the control pressure
C. Allows the controllers integral/ proportional ratio to be utilized
D. Provides for an explosion proof method of operation
205. A test performed on a piping system to check for leaks is a
A. hydraulic leak test
B. dynamic test
C. friction head test
D. hydrostatic test

206. For temperatures exceeding 1500 degrees Fahrenheit a common gasket material
A. Rubber
B. Silicone
C. Vinyl
D. Ceramic

207. An air to open valve is uses a

A. Fail-in-position actuator
B. Spring-to-open actuator
C. Dual spring actuator
D. Spring-to-close actuator

208. All of the following are typically applications of photocells except

A. automatic lighting control
B. position sensing
C. battery charging
D. size detection

209. What is the voltage drop as measured at R2

A. 4.8 VDC
B. 9.6 VDC
C. 14.4 VDC
D. 24.0 VDC

210. Which is a symbol for a globe valve?

A. A
B. B
C. C
D. D
 211. 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

212. 2A compressor keeps blowing a PSV for troubleshooting a technician should start looking at
A. Power switch setting
B. Pressure switch deadband
C. Level switch setting
D. Float swich deadband

213. In the figure provided the pipe line that carries working process fluid such as steam water or gas is labeled
as
A. A
B. B
C. C
D. D

213. A heat reactive dryer is producing damp instrument air what could be a simple fix
A. Replace desiccant
B. Change to a different desiccant
C. Adjust the cycle time
D. Add a second set of dryers

214. Type J thermocouple extension wire is

A. White & red
B. Yellow & red
C. Blue & red
D. Green & red

215. Which of the following gases should be used to purge tubing and pipe after cleaning
A. argon
B. Air
C. Nitrogen
D. helium
216. The positive wire color on a type K extension wire is
A. red
B. black
C. yellow
D. blue

217. Type K thermocouple wire is

A. Purple & Red
B. White & Red
C. Yellow & Red
D. Blue & Red

218. Most electrical shock fatalities are caused by

A. Contact with low voltage
B. Contact with high voltage
C. Shorts in electrically operated tools
D. Defective high voltage extension cords

219.What is density
A. the ratio of air to water
B. the weight of water
C. the ratio of a substance to the weight of an equal volume of air at the specific temperature and
pressure
D. the ratio of the specific gravity of air to nitrogen

220. Which of the following is a final control element in an instrument loop

A. control valve
B. plate
C. controller
D. output signal

221. Flow measurement is determined by fluid oscillations in which type of flow meter
A. Variable area flow meter
B. vortex flow meter
C. turbine flow meter
D. coriolis flow meter
222. The function of a control valve is to
A. Control, throttle, and monitor flow
B. Start, stop, and regulate flow
C. Stop, start, and measure flow
D. Throttle, start, and measure flow

86%
E. 73%
71%