NCCER Certification Industrial Maintenance and Mechanical Trades Syllabus

Industrial Maintenance and Mechanical Trades syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Industrial Maintenance and Mechanical Trades in NCCER Certification, not a summary of it.

1. 1

   Industrial Maintenance Fundamentals

   3 topics

   • Maintenance Safety and Practices
     • Lockout/tagout for mechanical systems
     • Preventive and predictive maintenance
   • Fasteners, Seals, and Gaskets
   • Bearings and Lubrication
2. 2

   Mechanical Power Transmission

   3 topics

   • Belt and Chain Drives
     • Sheave alignment and belt tensioning
     • Sprocket and chain maintenance
   • Gears and Couplings
   • Shaft Alignment Techniques
3. 3

   Pumps, Compressors, and Fluid Power

   3 topics

   • Pumps and Compressors
     • Centrifugal and positive displacement pumps
     • Compressor types and operation
   • Hydraulics and Pneumatics
     • Fluid power principles and components
     • Reading hydraulic/pneumatic schematics
   • Valve and Actuator Maintenance
4. 4

   Rigging, Hoisting, and Pipe Systems

   3 topics

   • Rigging and Signaling
     • Slings, hitches, and load weight calculation
     • Standard hand signals and crane communication
   • Pipefitting and Tube Bending
   • Equipment Installation and Leveling

Industrial Maintenance and Mechanical Trades flashcards for NCCER Certification

18 of 52 cards from the Industrial Maintenance and Mechanical Trades deck — real questions with worked answers.

1. What is the purpose of a lockout/tagout (LOTO) procedure in industrial maintenance?

   To isolate and de-energize equipment so it cannot be started while maintenance is performed, protecting workers from hazardous energy. Only the worker who applies a lock may remove it.

2. What is the difference between a 'lock' and a 'tag' in lockout/tagout?

   A lock is a physical device that prevents the energy-isolating device from being operated. A tag is a warning label only; it provides no physical restraint and is used when a lock cannot be applied.

3. In confined space entry, what three conditions define a 'permit-required confined space'?

   It is large enough to enter, has limited means of entry/exit, and is not designed for continuous occupancy — PLUS a hazard such as toxic/oxygen-deficient atmosphere, engulfment risk, or other serious hazard.

4. What is the safe oxygen concentration range for confined space entry?

   19.5% to 23.5% oxygen. Below 19.5% is oxygen-deficient; above 23.5% is oxygen-enriched (increased fire risk).

5. What does a Safety Data Sheet (SDS) provide and how many standardized sections does it have?

   An SDS provides hazard, handling, storage, and emergency information for a chemical. Under GHS it has 16 standardized sections.

6. What is the function of a fastener's torque specification?

   It defines the rotational force applied to achieve correct clamping load (preload). Too little allows loosening; too much can strip threads or yield the bolt.

7. What is the difference between a bolt's tensile strength and proof load?

   Tensile strength is the maximum stress a bolt withstands before breaking. Proof load is the maximum tension a bolt can carry without permanent (plastic) deformation — typically about 90% of yield.

8. What do the head markings on an SAE Grade 5 versus Grade 8 bolt indicate?

   Radial line markings indicate strength grade: 3 lines = Grade 5 (medium strength), 6 lines = Grade 8 (highest common strength). More lines = higher tensile strength.

9. What is the difference between a static seal and a dynamic seal?

   A static seal joins two surfaces with no relative motion (e.g., gasket, O-ring in a groove). A dynamic seal seals between parts that move relative to each other (e.g., shaft seal, packing).

10. What is the purpose of a gasket between two flanges?

    To fill surface irregularities and create a leak-proof seal between mating flange faces under compression, accommodating imperfections in the joint.

11. What is a mechanical seal and where is it commonly used?

    A mechanical seal uses two flat lapped faces (one rotating, one stationary) pressed together to prevent leakage along a rotating shaft. It is commonly used on centrifugal pumps.

12. What is the primary function of a bearing?

    To support a rotating shaft or load while reducing friction between moving parts, allowing smooth rotation or linear motion.

13. What is the difference between a ball bearing and a roller bearing?

    A ball bearing uses spherical balls and handles moderate loads at higher speeds. A roller bearing uses cylindrical or tapered rollers, giving greater line-contact area to carry heavier loads.

14. What is the difference between radial load and thrust (axial) load on a bearing?

    Radial load acts perpendicular to the shaft axis. Thrust (axial) load acts parallel to/along the shaft axis. Tapered roller and thrust bearings are designed for axial loads.

15. What are the four primary functions of a lubricant?

    Reduce friction, reduce wear, dissipate heat, and protect against corrosion (and help seal out contaminants).

16. What is the difference between boundary lubrication and hydrodynamic lubrication?

    Boundary lubrication has a very thin film with metal-to-metal contact at asperities (low speed/high load). Hydrodynamic lubrication has a full fluid film that completely separates surfaces, generated by motion.

17. What does viscosity measure in a lubricant, and what does a higher number mean?

    Viscosity measures a fluid's resistance to flow. A higher viscosity number means a thicker oil that flows more slowly.

18. When press-fitting a bearing onto a shaft, which race must the mounting force be applied to?

    Apply force only to the inner race when pressing onto a shaft (and only to the outer race when pressing into a housing). Never drive force through the balls/rollers, as it brinells the raceways.

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