INSTRUMENTATION NCCER PRACTICE TEST (2025/2026 UPDATED
CURRICULUM)
INTRODUCTION
This comprehensive practice examination is designed for comprehensive preparation for NCCER
Instrumentation certification examinations. It is based on the 2025/2026 NCCER Industrial
Maintenance Electrical & Instrumentation Technician curriculum (Levels 1-4), which was revised
in November 2024 to reflect current industry standards . This assessment targets instrument
technicians, maintenance personnel, and trainees seeking NCCER certification, covering all
critical competency areas including safety protocols, technical drawings, electrical theory,
process control systems, calibration procedures, and advanced instrumentation technologies.
The examination structure mirrors the actual two-hour closed-book assessment format with a
minimum passing score of 75% .
LEVEL 1: INSTRUMENTATION FUNDAMENTALS & SAFETY (Questions 1-60)
1. The density of a fluid affects the displacer's:
A. location
B. buoyancy
C. length
D. height
Answer: B
Rationale: Buoyancy force is directly proportional to fluid density according to Archimedes'
principle. In level measurement applications, denser fluids provide greater buoyant force on
displacers, requiring compensation in calibration calculations.
2. What mode must the controller be in before any changes are made to the process variable?
A. manual
B. automatic
C. shut down
D. power off
Answer: A
,Rationale: Controllers must be placed in manual mode before adjusting process variables to
prevent unexpected output changes or process upsets. This safety protocol ensures the
operator maintains direct control during adjustments.
3. Which sealant is prohibited on oxygen service connections?
A. Pipe dope
B. Teflon tape
C. Teflon paste
D. Anaerobic sealant
Answer: C
Rationale: Teflon paste is specifically prohibited on oxygen service due to the extreme fire and
explosion hazard. The petroleum-based carrier in Teflon paste can ignite in enriched oxygen
environments.
4. Before working on de-energized circuits containing capacitors, what must be done?
A. Check voltage with a multimeter
B. Discharge all capacitors
C. Remove all fuses
D. Apply lockout/tagout only
Answer: B
Rationale: Capacitors store electrical energy and can deliver lethal shocks even after power is
removed. NCCER safety standards require complete discharge before servicing to prevent
electrical shock injuries.
5. According to OSHA and industry statistics, most electrical shock fatalities are caused by:
A. High voltage transmission lines
B. Medium voltage equipment
C. Low voltage contact
D. Static electricity discharge
Answer: C
,Rationale: Contrary to common belief, the majority of electrical shock fatalities in industrial
settings result from low voltage contact (under 600V). Workers often underestimate the lethal
potential of lower voltages and bypass safety procedures.
6. Who issues the official lockout/tagout guidelines followed in industrial maintenance?
A. NFPA
B. NEC
C. OSHA
D. ANSI
Answer: C
Rationale: OSHA (Occupational Safety and Health Administration) issues the mandatory
lockout/tagout standards under 29 CFR 1910.147, requiring specific procedures for energy
isolation during maintenance activities.
7. When entering a confined space, atmosphere testing must first check for:
A. Toxic gases
B. Oxygen content
C. Flammable vapors
D. Carbon dioxide levels
Answer: B
Rationale: Confined space entry procedures require oxygen content verification first because
oxygen deficiency (<19.5%) or enrichment (>23.5%) presents immediate life-threatening
conditions before other hazards are assessed.
8. Bills of material are typically found on which type of drawing?
A. P&ID
B. Loop sheet
C. General Arrangement drawing
D. Isometric drawing
Answer: C
, Rationale: General Arrangement drawings contain the bill of materials, which lists all
components, parts, and quantities required for installation. This documentation is essential for
procurement and inventory management.
9. When multiple instruments are installed in the same control loop, they share:
A. A common power supply
B. A common loop number
C. The same physical location
D. Identical calibration ranges
Answer: B
Rationale: Instruments in the same control loop share a common loop number for identification
and documentation purposes. This numbering system maintains traceability from field devices
through control systems.
10. Instrument elevation above grade is found on which drawing type?
A. P&ID
B. Loop diagram
C. Location drawing
D. Wiring diagram
Answer: C
Rationale: Location drawings specify the physical coordinates and elevation of instruments
relative to plant grade or datum. This information is critical for installation planning and
structural support design.
11. Loop testing involves which fundamental activity?
A. Replacing failed components
B. Stimulation of the process variable
C. Rewiring the entire loop
D. Calibrating only the controller
Answer: B
CURRICULUM)
INTRODUCTION
This comprehensive practice examination is designed for comprehensive preparation for NCCER
Instrumentation certification examinations. It is based on the 2025/2026 NCCER Industrial
Maintenance Electrical & Instrumentation Technician curriculum (Levels 1-4), which was revised
in November 2024 to reflect current industry standards . This assessment targets instrument
technicians, maintenance personnel, and trainees seeking NCCER certification, covering all
critical competency areas including safety protocols, technical drawings, electrical theory,
process control systems, calibration procedures, and advanced instrumentation technologies.
The examination structure mirrors the actual two-hour closed-book assessment format with a
minimum passing score of 75% .
LEVEL 1: INSTRUMENTATION FUNDAMENTALS & SAFETY (Questions 1-60)
1. The density of a fluid affects the displacer's:
A. location
B. buoyancy
C. length
D. height
Answer: B
Rationale: Buoyancy force is directly proportional to fluid density according to Archimedes'
principle. In level measurement applications, denser fluids provide greater buoyant force on
displacers, requiring compensation in calibration calculations.
2. What mode must the controller be in before any changes are made to the process variable?
A. manual
B. automatic
C. shut down
D. power off
Answer: A
,Rationale: Controllers must be placed in manual mode before adjusting process variables to
prevent unexpected output changes or process upsets. This safety protocol ensures the
operator maintains direct control during adjustments.
3. Which sealant is prohibited on oxygen service connections?
A. Pipe dope
B. Teflon tape
C. Teflon paste
D. Anaerobic sealant
Answer: C
Rationale: Teflon paste is specifically prohibited on oxygen service due to the extreme fire and
explosion hazard. The petroleum-based carrier in Teflon paste can ignite in enriched oxygen
environments.
4. Before working on de-energized circuits containing capacitors, what must be done?
A. Check voltage with a multimeter
B. Discharge all capacitors
C. Remove all fuses
D. Apply lockout/tagout only
Answer: B
Rationale: Capacitors store electrical energy and can deliver lethal shocks even after power is
removed. NCCER safety standards require complete discharge before servicing to prevent
electrical shock injuries.
5. According to OSHA and industry statistics, most electrical shock fatalities are caused by:
A. High voltage transmission lines
B. Medium voltage equipment
C. Low voltage contact
D. Static electricity discharge
Answer: C
,Rationale: Contrary to common belief, the majority of electrical shock fatalities in industrial
settings result from low voltage contact (under 600V). Workers often underestimate the lethal
potential of lower voltages and bypass safety procedures.
6. Who issues the official lockout/tagout guidelines followed in industrial maintenance?
A. NFPA
B. NEC
C. OSHA
D. ANSI
Answer: C
Rationale: OSHA (Occupational Safety and Health Administration) issues the mandatory
lockout/tagout standards under 29 CFR 1910.147, requiring specific procedures for energy
isolation during maintenance activities.
7. When entering a confined space, atmosphere testing must first check for:
A. Toxic gases
B. Oxygen content
C. Flammable vapors
D. Carbon dioxide levels
Answer: B
Rationale: Confined space entry procedures require oxygen content verification first because
oxygen deficiency (<19.5%) or enrichment (>23.5%) presents immediate life-threatening
conditions before other hazards are assessed.
8. Bills of material are typically found on which type of drawing?
A. P&ID
B. Loop sheet
C. General Arrangement drawing
D. Isometric drawing
Answer: C
, Rationale: General Arrangement drawings contain the bill of materials, which lists all
components, parts, and quantities required for installation. This documentation is essential for
procurement and inventory management.
9. When multiple instruments are installed in the same control loop, they share:
A. A common power supply
B. A common loop number
C. The same physical location
D. Identical calibration ranges
Answer: B
Rationale: Instruments in the same control loop share a common loop number for identification
and documentation purposes. This numbering system maintains traceability from field devices
through control systems.
10. Instrument elevation above grade is found on which drawing type?
A. P&ID
B. Loop diagram
C. Location drawing
D. Wiring diagram
Answer: C
Rationale: Location drawings specify the physical coordinates and elevation of instruments
relative to plant grade or datum. This information is critical for installation planning and
structural support design.
11. Loop testing involves which fundamental activity?
A. Replacing failed components
B. Stimulation of the process variable
C. Rewiring the entire loop
D. Calibrating only the controller
Answer: B
