NCCCO Drill Rig Operator

Before starting any drill rig, what document must the operator confirm is present and current at the workstation?

• AAnnual tax return for the equipment
• BOperator's manual for the specific rig being used
• COriginal purchase invoice for the rig
• DOSHA Form 300 injury log

During pre-operational inspection of a foundation drill rig, hydraulic hoses should be checked primarily for:

• AColor and brand markings
• BCuts, abrasion, bulges, kinks, and leaks
• CManufacturer date stamps only
• DHose internal pressure rating with a gauge

The operator finds a chipped tooth on the auger flight during pre-operational inspection. The correct action is to:

• AContinue work; teeth chip routinely and are not safety-critical
• BDocument the defect, evaluate whether it affects safe drilling, and replace if needed bef…
• CSharpen the chip with a file in the field and continue
• DReverse the auger direction to avoid stressing the chipped tooth

Which item is NOT typically part of a daily drill rig pre-operational inspection?

• AEngine oil and coolant levels
• BHydraulic oil level and condition
• CAnnual third-party structural recertification
• DDrill mast and pinned connections

The mast pin and head holder on a foundation drill rig should be inspected for:

• APaint touch-up only
• BCracks, deformation, missing retaining hardware, and wear
• CCorrect serial-number alignment
• DManufacturer's signature stamp

Operator pre-start checks on a foundation drill rig should be performed:

• AOnce a week is sufficient for most rigs
• BBefore each shift and after any incident or change in conditions
• COnly by the mechanic, never by the operator
• DOnly when an inspector is on site

Wire rope on a drill rig hoist line should be removed from service when:

• AIt shows any visible surface dirt
• BIt is more than one year old in any condition
• CIt exhibits broken wires, kinks, severe corrosion, or core protrusion exceeding manufactu…
• DOnly when it breaks completely under load

An operator notices that the rotary head has a small oil weep at one motor case drain. The most appropriate response is to:

• AIgnore it; case-drain weeps are normal and harmless
• BDocument the leak, monitor closely, and follow employer and manufacturer guidance on repa…
• CTighten the case-drain fitting until the leak stops, then continue work
• DRemove the case-drain line entirely

Which best describes the operator's duty regarding posted load and torque charts on a foundation drill rig?

• ACharts are decorative and may be removed if they fade
• BCharts must remain legible at the workstation and may not be exceeded in operation
• CCharts apply only to new rigs in their first year of service
• DCharts may be ignored if the operator has many years of experience

Before raising the mast on a foundation drill rig, the operator should:

• AVerify overhead clearance, ground levelness, and that no personnel are in the swing or fa…
• BHonk twice and proceed regardless of nearby workers
• CRaise the mast only after the auger is already attached and spinning
• DRaise the mast with the rig on the truck trailer for stability

On a tracked foundation drill rig, the operator should check track tension because:

• ALoose track tension is desirable for fast travel
• BImproper track tension can cause track derailment, accelerated wear, and lost ground cont…
• CTrack tension affects only paint life
• DTrack tension determines drilling depth limits

The auxiliary winch line on a drill rig is most commonly used to:

• AReplace the main hoist for drilling operations
• BHandle pipe, tooling, casing sections, and reinforcement cages
• CPower the rotary table
• DProvide cab heating

Backup alarms, horns, and warning lights on a drill rig should be:

• AVerified operational during the pre-shift check
• BDisconnected to avoid disturbing nearby residents
• CTested annually only
• DReplaced only when the rig is sold

Operator pre-start inspection finds a fire extinguisher missing from its bracket. The correct response is to:

• AContinue work; one missing extinguisher will not affect the job
• BTake the extinguisher from a different rig without telling anyone
• CReplace the extinguisher before starting drilling operations
• DWait until quarterly inspection to address it

On a Kelly-bar drill rig, the operator should inspect the Kelly bar before each shift for:

• APaint condition only
• BBends, cracks, worn drive ribs, locking-bar wear, and damaged keys
• CCosmetic dirt buildup
• DLength match to the auger flight pitch

Which document records the daily operator pre-shift inspection?

• AThe bill of lading
• BThe daily inspection or operator log per employer procedure
• CThe OSHA poster in the trailer
• DThe state contractor license

Before setting up a foundation drill rig over an excavation, the operator should:

• AIgnore the depth of the excavation as long as the engine starts
• BConfirm allowable setback from the excavation edge per the plan, soil conditions, and rig…
• CPlace the tracks parallel to the very edge of the excavation
• DPark the rig touching the shoring wall

Drill rig mat boards or crane mats are used primarily to:

• AMark the property line
• BDistribute the rig's ground pressure over soft or variable subgrade
• CImprove fuel economy
• DSpeed up rotation

If groundwater is encountered above the design level in a drilled shaft excavation, the operator should expect to:

• AIgnore the water and keep drilling open hole
• BSwitch to or maintain a wet-method excavation using slurry or full casing as planned
• CPump the hole dry repeatedly with no other change in method
• DDrill faster to outrun the water

Underground utility locates on a drilled-shaft site should be:

• ASkipped if the operator has worked the site before
• BConfirmed by One-Call markings and, in critical areas, by additional methods such as GPR…
• CTrusted only when verified by aerial photos
• DRequired only when the operator can see overhead power lines

Why is the slope of a working platform important for a foundation drill rig?

• AIt changes the color of the rig's paint
• BSlope changes the effective center of gravity and increases overturn risk
• CSlope determines the rig's serial number
• DSlope sets the diesel fuel grade

The minimum approach distance to energized overhead power lines for a drill rig depends on:

• AThe rig color
• BThe line voltage and the controlling federal or state regulation in force
• CThe operator's union
• DThe auger diameter

Soft, organic, or fill soil at the working surface most likely requires:

• ANo additional preparation; tracks float on any soil
• BAn engineered working platform such as crushed stone over geotextile or timber mats
• CDrilling with no casing at all
• DUse of a smaller diameter auger

A foundation drill rig is set up near a steep slope. The operator should:

• APosition the tracks perpendicular to the slope only when no other choice exists, and trea…
• BDrive along the slope edge at full speed
• CLower the mast onto the slope for stability
• DIgnore the slope if the rig has a high horsepower engine

What is the operator's role when boring logs and soil profiles are provided for a shaft location?

• AIgnore them and feel the cut by ear
• BReview them to anticipate soil layers, water tables, hard rock, and tool selection
• CUse them only to estimate fuel consumption
• DTranslate them to the language of the manufacturer

Bottom heave during drilled-shaft excavation is most likely when:

• AThe slurry head inside the excavation is well above the surrounding groundwater table
• BThe slurry head drops below the surrounding groundwater table
• CThe excavation is in dry, dense rock
• DThe operator uses too small a Kelly bar

When a private utility locate has not been completed in an area where utilities are suspected, the operator should:

• ADrill anyway and hope for the best
• BStop the planned drilling activity and notify the responsible party so the locate can be…
• CUse a larger auger to reduce the chance of hitting a utility
• DDrill faster to clear the area before utilities can react

Drilled-shaft installation work platforms are most commonly designed in accordance with:

• AThe operator's personal preference
• BANSI/ASSP A10.23 and project-specific engineering guidance
• CWhatever leftover gravel is on site
• DASME B30.5 directly

If overhead power lines pass directly above a planned shaft location, the operator should:

• AProceed and rely on luck to stay clear
• BCoordinate with the utility for de-energizing, relocation, or insulating barriers and fol…
• CUse a wooden auger to insulate the rig
• DIncrease rig speed to reduce time of exposure

Weather conditions that should prompt the operator to stop or restrict drilling operations include:

• AMild sunshine with light wind
• BLightning in the immediate area or sustained winds beyond manufacturer or job-specific li…
• CRoutine rain showers under any condition
• DAny cloud cover at all

Once a shaft is excavated and ready for concrete, leaving the hole open without protection is a hazard primarily because:

• AIt looks unprofessional
• BPersonnel or equipment can fall in, and sidewalls or bottom can degrade over time
• CThe shaft will rotate on its own
• DThe shaft will become magnetized

Crowd, when applied through a Kelly bar, refers to:

• AThe number of laborers around the rig
• BThe vertical force the rig applies through the drill string to advance the tool
• CThe maximum operator weight allowed in the cab
• DBystander spacing around the hole

A rotary table on a foundation drill rig provides:

• AVertical thrust only
• BTorque to rotate the Kelly bar and drilling tool
• CHydraulic cooling for the engine
• DAn emergency stop function

Telescoping Kelly bars come in two basic types:

• AHot and cold
• BFriction Kelly bars and interlocking Kelly bars
• CWood and rubber Kelly bars
• DDiesel and electric Kelly bars

An interlocking Kelly bar is preferred over a friction Kelly bar when:

• ADrilling in very soft surface soils only
• BHigh torque must be transmitted in dense sand, gravel, or rock at any Kelly extension
• CThe job does not need any rotation
• DThe Kelly bar will not extend at all

A telescoping Kelly bar drill rig advances by lifting the auger out of the hole and emptying spoil. This basic open-hole cycle is sometimes called the:

• AContinuous flight cycle
• BSpoil and dump cycle or shaft drilling cycle
• CSlurry mixing cycle
• DStrand placement cycle

Temporary casing in a drilled shaft is used to:

• AColor-code the shaft
• BStabilize the upper portion of the excavation through caving or loose soils
• CReplace the rebar cage
• DPrevent the engine from overheating

A casing oscillator installs full-depth casing by:

• ARotating the casing continuously in one direction only
• BOscillating the casing back and forth while pushing it down, often with a separate cleano…
• CLifting the casing free of the hole during drilling
• DHeating the casing until it sinks

Bentonite drilling slurry stabilizes the shaft sidewall primarily by:

• AForming a low-permeability filter cake on the wall and exerting hydrostatic pressure
• BHeating the wall until it fuses
• CVacuuming the wall outward
• DRemoving all groundwater from the formation

Polymer drilling slurries differ from bentonite slurries in that polymers generally:

• AForm a thick filter cake on the wall
• BStabilize the wall through long polymer chains and hydrostatic pressure with little or no…
• CAre used only in cold weather
• DEliminate the need for reinforcement

Maintaining slurry head above the surrounding groundwater table is required to:

• APrevent the engine from stalling
• BResist inflow, sidewall collapse, and bottom heave during excavation
• CAllow the rig to travel faster
• DCool the rotary drive

When advancing a Kelly-bar auger and the rig torque suddenly spikes near refusal, the operator's best initial action is to:

• AApply maximum crowd until the auger breaks free
• BEase crowd, reduce rotation, lift slightly, and assess the obstruction or tool change
• CSlam the auger up and down rapidly
• DIncrease engine RPM to its maximum

The operator should swing the loaded auger to dump spoil at a location that is:

• ADirectly over open shafts or rebar cages
• BClear of personnel, open shafts, traffic, and obstructions, and within the rig's stable s…
• COn top of the slurry mixing tank
• DAnywhere convenient with no other consideration

Cleaning the bottom of a drilled shaft before concrete placement is important because:

• AIt improves the color of the concrete
• BLoose spoil at the base can reduce end bearing and bond, and degrade integrity testing
• CIt is required only on shafts that are inspected by drones
• DBottom debris improves load capacity

The 'crowd' control on a foundation drill rig typically:

• AIncreases or decreases vertical force on the tool
• BSelects the broadcast radio station
• CDisables the brakes
• DLocks out the slurry pump

Reverse-circulation drilling uses:

• AAir or fluid pumped down inside the drill string and returns spoil up through the central…
• BAir or fluid pumped down the outside of the drill string with spoil rising up the inside…
• CNo fluid at all
• DSolid steel rods without any flow path

When ground personnel approach the mast to disconnect a heavy tool from the Kelly, the operator should:

• AContinue rotating the rotary head as personnel approach
• BStop motion, acknowledge a clear signal from ground personnel, lock controls, and confirm…
• CAssume personnel will get out of the way automatically
• DLet the tool keep swinging until they grab it