Instrument TECH NCCER Questions and Answers

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Instrument TECH NCCER Questions and
Answers 2025-2026
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 -Answer- ✔D. At the time each test is completed
(INST LVL4)(12410-16/ Section 3.2.0)

2) Teflon paste must not be used on :
A. Nitrogen service
B. Natural gas service
C. Water service
D. Oxygen service -Answer- ✔D. Oxygen service (INST LVL 1 )(12109-14/Section
2.1.1)

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 -Answer- ✔C. Lost the neutral

4) Gain increase when tube :
A. Back bends are made
B. Bend radius increases
C. Size decreases
D. Long radius elbows are used -Answer- ✔B. Bend radius increases (INST LVL
2)(12302-15 section 2.1.1)

5) A temperature measuring device that produces a voltage as the temperature
changes is a / an :
A. RTD
B. Thermistor
C. Thermometer
D. Thermocouple -Answer- ✔D. Thermocouple (INST LVL 2) (12110-15 section 1.2.2)

6) A pressure piping code is found in :
A. ANSI B 31.1
B. NEC 690 .
C. OSHA1910 .
D. ISA S 5.1 -Answer- ✔A. ANSI B 31.1


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7) When marking tubing for cutting , the preferred method is
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 -Answer- ✔C. Mark the tube with a felt tip pen

8) An example of direct measurement indicator is a :
A. Pressure gauge
B. Bulb thermometer
C. Sight glass
D. Flowmeter -Answer- ✔C. Sight glass

9) On the image , how many hand valves are installed on Tank 1201C
A. 1
B. 2
C. 3
D. 4 -Answer- ✔C. 3

10) 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 -Answer- ✔C. Verify that there is a problem

11) Where can the appropriate elevation of an instrument be found ?
A. Location drawing
B. P & ID
C. Flow diagram
D. Loop drawing -Answer- ✔A. Location drawing

12) Chemical cleaning of tubing attached to instruments may cause damage to sensor
A. Electronics
B. Paint
C. Elements
D. Bolts -Answer- ✔C. Elements

13) 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 -Answer- ✔C. 1 to 3 degrees

14) Cable shields should be connected to the :
A. Signal ground reference point


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B. Ground at each accessible location
C. First accessible grounding electrode
D. Raceway or cable tray in which the cable is routed -Answer- ✔B. Ground at each
accessible location

15) 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 -Answer- ✔C. Exclusive control

16) A 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 -Answer- ✔B. Pressure switch deadband

17) 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 -Answer- ✔A. A

18) 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 -Answer- ✔C. Adjust the cycle time

19) Type J thermocouple extension wire is
A. White & red
B. Yellow & red
C. Blue & red
D. Green & red -Answer- ✔A. White & red

20) Which of the following gases should be used to purge tubing and pipe after cleaning
A. argon
B. Air
C. Nitrogen
D. helium -Answer- ✔C. Nitrogen




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21) When pressure testing , the required documentation includes :
A. Specification sheets
B. Troubleshooting flow charts
C. Temperature , pressure , and test medium
D. Required corrective measures -Answer- ✔C. Temperature , pressure , and test
medium

22)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 -Answer- ✔D. Spring-to-close Actuator

23) 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 -Answer- ✔A. Velocity

24) What is the resistance in the circuit ?
A. 50 ohms
B. 100 ohms
C. 150 ohms
D. 200 ohms -Answer- ✔D. 200 ohms

25) After a bend is completed , all tubing will exhibit :
A. Hardness
B. Springback
C. Bending errors
Discoloration -Answer- ✔B. Springback

26) 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 -Answer- ✔D. Ball valve

27) 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 -Answer- ✔B. At the control cabinet .




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