100+ Free NCCCO Service Truck Crane Practice Questions

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Which is the most appropriate way to plan a multi-pick well-servicing job with an STC?

Plan only the heaviest single lift and improvise for the rest

Plan each pick with weight, radius, configuration, chart capacity, and rigging requirements documented before work starts

Plan only at the end of the shift

Plan only the rigging, not the crane configuration

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2026 Statistics

Key Facts: NCCCO Service Truck Crane Exam

STC Specialty Questions

NCCCO STC exam blueprint

90 min

STC Exam Time

NCCCO STC exam blueprint

70%

Recommended Pass Mark

NCCCO STC scoring guidance

5 years

Certification Validity

NCCCO mobile crane certification policy

18+

Minimum Age

NCCCO eligibility

20 ft

Power Line Clearance Option 1

OSHA 29 CFR 1926.1408

The NCCCO STC specialty written exam is 70 questions in 90 minutes and pairs with the NCCCO Mobile Crane Operator core written exam plus an STC practical. STC scope focuses on truck-mounted telescopic boom cranes used in well servicing, utility, and industrial maintenance work. Candidates should expect heavy coverage of outrigger setup, capacity by configuration, OSHA 1926.1408 power-line clearances, OSHA 1926.1431 personnel hoisting rules, and ASME B30.5 mobile crane concepts. Certification is valid for 5 years and recertification can sometimes waive the practical with documented hours.

Sample NCCCO Service Truck Crane Practice Questions

Try these sample questions to test your NCCCO Service Truck Crane exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which definition best describes a service truck crane (STC)?

A.A crawler-mounted lattice boom crane used for heavy steel erection

B.A truck-mounted telescopic boom crane designed for well servicing, utility, and industrial maintenance work

C.An articulating knuckle boom mounted on a flatbed for loading and unloading

D.A self-erecting tower crane used for low-rise building construction

Explanation: A service truck crane is a mobile crane mounted on a truck chassis with a telescopic boom and hydraulic outriggers. STCs are sized for service applications such as oil and gas well servicing, utility right-of-way work, and industrial maintenance rather than heavy general construction.

2Service truck cranes are typically rated up to approximately what capacity?

A.5 tons

B.30 tons

C.100 tons

D.300 tons

Explanation: STCs are generally rated up to roughly 30 tons. They are sized for service work rather than the heavy capacities of dedicated mobile construction cranes, which can exceed 100 tons.

3Which OSHA subpart primarily governs service truck cranes used in construction with a maximum rated capacity at or above 2,000 lb?

A.29 CFR 1910 Subpart N

B.29 CFR 1926 Subpart CC

C.29 CFR 1926 Subpart M

D.29 CFR 1910 Subpart D

Explanation: OSHA 29 CFR 1926 Subpart CC (Cranes and Derricks in Construction) applies to most STCs used in construction with a rated capacity of more than 2,000 lb. It covers operator certification, inspection, power-line clearance, and personnel hoisting.

4Which ASME consensus standard most directly applies to telescopic boom mobile cranes including service truck cranes?

A.ASME B30.2 Overhead and Gantry Cranes

B.ASME B30.5 Mobile and Locomotive Cranes

C.ASME B30.17 Cranes and Monorails

D.ASME B30.22 Articulating Boom Cranes

Explanation: ASME B30.5 covers mobile and locomotive cranes, which includes telescopic boom truck-mounted cranes such as STCs. B30.22 applies to articulating (knuckle) boom cranes, which are a different machine class.

5Before deploying outriggers on an STC at a well site, what is the operator's first ground-related responsibility?

A.Spray the ground with water to compact it

B.Evaluate that the ground can support the crane's loaded weight on outriggers

C.Confirm the truck's parking brake holds without outriggers

D.Measure boom angle for the planned lift

Explanation: Before deployment, the operator must evaluate that the ground will support the crane's full loaded weight transmitted through the outrigger pads. Slope, fill, voids, frozen ground, and saturated soil can all fail under outrigger pressure.

6Under OSHA 29 CFR 1926.1408 Table A, what is the minimum clearance from energized power lines rated up to 50 kV when no encroachment-prevention measures beyond Option 3 are in place?

A.5 feet

B.10 feet

C.20 feet

D.35 feet

Explanation: Under OSHA 1926.1408 Table A, the minimum clearance from energized lines of 0 up to 50 kV is 10 feet when Option 3 procedures are in place. Option 1 default clearance is 20 feet for lines up to 350 kV.

7What is the primary purpose of fully extending the outriggers on a service truck crane before lifting?

A.To increase travel speed between job sites

B.To allow the published rated capacity to apply by widening the support base

C.To improve fuel economy of the chassis engine

D.To reduce hydraulic pressure in the boom

Explanation: Outriggers widen the crane's effective base of support, increasing stability and allowing the manufacturer's published capacity to apply. Most STC load charts assume fully extended outriggers; partial extension severely reduces rated capacity.

8On an STC load chart, capacity at a fixed boom length generally changes how as the operating radius increases?

A.Capacity increases because the load is farther from the boom

B.Capacity stays the same because the boom length did not change

C.Capacity decreases because the load moment increases

D.Capacity decreases only if the boom angle is below horizontal

Explanation: As radius increases at a constant boom length, the load moment (load times radius) grows and the crane has less capacity available before tipping or structural limits are reached. Charts reflect this with smaller capacity values at larger radii.

9An STC chart lists 12,000 lb at 20 ft radius and 9,500 lb at 25 ft radius. The actual operating radius will be 22 ft. Which capacity should the operator use?

A.12,000 lb

B.9,500 lb

C.10,750 lb (average of the two)

D.Whichever the operator prefers

Explanation: When the exact radius is not listed, use the next larger (less favorable) listed radius. 22 ft falls between 20 ft and 25 ft, so the operator must use the 25 ft value of 9,500 lb.

10Which task is most commonly performed by a service truck crane at an oil and gas well site?

A.Setting bridge girders on a highway expansion

B.Pulling sucker rods and downhole pumps from the wellbore

C.Erecting a tower crane jib

D.Lifting precast concrete tilt-up panels

Explanation: Service truck cranes are routinely used at oil and gas well sites to pull sucker rods and downhole pumps, set and remove tubing, and reposition wellhead components. Heavy structural lifting is the work of larger mobile or tower cranes.

About the NCCCO Service Truck Crane Exam

The NCCCO Service Truck Crane Operator (STC) certification covers truck-mounted telescopic boom cranes used in oil and gas well servicing, pipeline work, utility right-of-way operations, mining, and industrial maintenance. The 70-question specialty written exam emphasizes STC-specific components, outrigger and stability setup, load-chart interpretation, and industry-specific hazards such as energized power lines and H2S environments.

Assessment

70-question STC specialty written exam in 90 minutes, paired with the NCCCO Mobile Crane Operator core written exam and the STC practical exam for full certification

Time Limit

90 minutes

Passing Score

70%

Exam Fee

See NCCCO fees page; fees vary by core, specialty, and practical combination (NCCCO / Prometric (written) and NCCCO-accredited practical test sites)

NCCCO Service Truck Crane Exam Content Outline

25%

STC Configuration and Components

Service truck crane chassis, slewing column, telescopic boom sections, hydraulic outriggers, winch and wire rope, hooks with safety latches, and load-handling hardware specific to STC applications.

30%

Setup, Stability, and Load Charts

Leveling the truck, full outrigger deployment, outrigger pad sizing, capacity decreases with radius and boom angle, on-rubber versus on-outrigger charts, parts of line, and least-favorable-configuration limits.

20%

Well Servicing and Industry Applications

Oil and gas well servicing lifts, pulling pumps and rods, setting tubing and wellheads, pipeline and utility work, beam-jack repositioning, and personnel hoisting per OSHA 1926.1431.

25%

Hazards, Inspection, and Regulations

Power-line clearances per OSHA 1926.1408, H2S awareness and atmospheric monitoring, daily and periodic inspections, wire-rope retirement criteria, and alignment with OSHA Subpart CC and ASME B30.5.

How to Pass the NCCCO Service Truck Crane Exam

What You Need to Know

Passing score: 70%
Assessment: 70-question STC specialty written exam in 90 minutes, paired with the NCCCO Mobile Crane Operator core written exam and the STC practical exam for full certification
Time limit: 90 minutes
Exam fee: See NCCCO fees page; fees vary by core, specialty, and practical combination

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NCCCO Service Truck Crane Study Tips from Top Performers

1Treat outrigger setup as a high-frequency topic. Full deployment, pad sizing, and ground support drive most STC capacity decisions.

2Memorize the OSHA 1926.1408 Table A clearances (10 ft up to 50 kV, then scaling) and how the three encroachment-prevention options interact.

3Understand on-rubber versus on-outrigger charts. STCs sometimes pick from the truck, but rated capacity drops dramatically when the outriggers are not deployed.

4Practice load-chart questions where the exact radius is not listed. The rule is to use the next larger (less favorable) radius for capacity.

5Study well-servicing-specific lifts (pulling rods, setting tubing, personnel baskets) and the OSHA 1926.1431 personnel-hoisting checklist.

6Know wire-rope inspection and retirement criteria per ASME B30.5. STC winches at well sites see abrasive duty and frequent inspection.

7Review H2S awareness, escape respirators, atmospheric monitoring, and Class I Division 1 hazardous-area rules for oil and gas job sites.

8Run timed 70-question drills. 90 minutes leaves about 77 seconds per question, so chart reading must be fast and confident.

Frequently Asked Questions

How many questions are on the NCCCO Service Truck Crane Operator specialty exam?

The NCCCO STC specialty written exam has 70 questions with a 90-minute time limit. Candidates must also pass the NCCCO Mobile Crane Operator core written exam and the STC practical exam for full certification.

What is a service truck crane (STC)?

A service truck crane is a mobile crane mounted on a truck chassis with a telescopic boom and hydraulic outriggers, typically rated up to about 30 tons. STCs are designed for well servicing, pipeline work, utility right-of-way operations, and industrial maintenance rather than general construction lifting.

Is the STC specialty written exam enough to become NCCCO certified?

No. The STC specialty exam is one part of the certification path. Candidates must also pass the NCCCO Mobile Crane Operator core written exam and the STC practical exam at an NCCCO-accredited site.

What OSHA standards apply to STC operators?

Service truck cranes with capacity at or above 2,000 lb in construction work fall under OSHA Subpart CC (29 CFR 1926.1400 series). Key power-line and personnel-hoisting rules in 1926.1408 and 1926.1431 directly affect STC operators in oil and gas, utility, and pipeline work.

What is the minimum power-line clearance for an STC operating near energized lines up to 50 kV?

OSHA 1926.1408 requires a minimum clearance of 20 feet from energized power lines up to 350 kV under Option 1 unless lines are de-energized and grounded or Option 2 or 3 procedures are implemented. For 0 to 50 kV, the Table A clearance under encroachment-prevention measures is 10 feet.

How long is NCCCO STC certification valid?

NCCCO STC certification is valid for 5 years. Recertification must be completed during the 12 months before expiration. Candidates with documented qualifying crane hours may not need to retake the practical exam at recertification.