100+ Free ISA Utility Specialist Practice Questions

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2026 Statistics

Key Facts: ISA Utility Specialist Exam

100

Practice Questions

OpenExamPrep

115

Exam Questions

ISA

2 hours

Time Limit

ISA

75%

Passing Score

ISA

Content Domains

ISA

Certified Arborist

Required Prerequisite

ISA

The ISA Certified Arborist Utility Specialist is the International Society of Arboriculture's specialty credential for electric utility vegetation management professionals. The written exam consists of 115 multiple-choice questions (100 scored plus 15 unscored pretest items), each with four options and one correct answer, delivered over two hours, with a 75% passing score. Eligibility requires a current ISA Certified Arborist credential plus 2,000 hours of verifiable utility vegetation management experience in the past two years (or 36 cumulative months of qualifying full-time work). Content spans five weighted areas: Electric Utility Pruning (20%), Program Management (13%), Integrated Vegetation Management (18%), Electrical Knowledge (29%), and Customer Relations (20%). This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample ISA Utility Specialist Practice Questions

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

1Which pruning method is considered the most appropriate practice for clearing trees away from energized overhead conductors while preserving tree health?

A.Topping the tree to a uniform height

B.Directional (lateral) pruning to a sound lateral branch

C.Shearing the entire crown to a hedge form

D.Flush cutting branches at the trunk

Explanation: Directional pruning, also called lateral or natural-target pruning, removes branches growing toward the conductors and directs growth away from the line by cutting back to a vigorous lateral or to the branch collar. This follows ANSI A300 (Part 1) and is the accepted utility line-clearance standard because it maintains structure and tree health.

2A proper natural-target pruning cut on a branch large enough to have a branch collar should be made just outside the:

A.Branch bark ridge and branch collar

B.Center of the parent stem

C.Pith of the branch

D.Last visible bud

Explanation: A natural-target cut is made just outside the branch bark ridge and branch collar, leaving the collar intact so the tree can compartmentalize and seal the wound. Cutting into the collar (flush cut) or leaving a long stub both impair wound closure.

3When removing a large limb near a conductor, the three-cut method is used primarily to prevent:

A.Sunscald on the remaining bark

B.Bark tearing/stripping down the trunk

C.Sprouting at the cut

D.Drift of the limb into the line

Explanation: The three-cut (jump-cut) method uses an undercut, a relief cut to drop the limb, then a final cut at the collar. The first two cuts remove the limb's weight so the bark does not tear or strip down the parent stem when the branch falls, protecting the trunk and the final cut surface.

4A 'V' or center cut (crotch pruning) on a tree directly under a conductor is performed to:

A.Reduce overall tree height permanently

B.Remove branches growing up through the line and direct growth to the sides

C.Increase canopy density above the line

D.Eliminate the need for future cycle pruning

Explanation: A V-cut (also called through or center pruning) removes the central leader and branches growing up through the conductors, directing future growth to either side of the line. It is appropriate where the line passes through the crown, and the cuts are still made to laterals using natural-target technique.

5The amount of live crown that should generally NOT be exceeded when removing foliage from a mature tree in a single pruning operation is about:

A.10 percent

B.25 percent

C.50 percent

D.75 percent

Explanation: ANSI A300 guidance is that no more than about 25 percent of the live crown (functioning foliage) should be removed from a mature tree in a single growing season, because excessive removal stresses the tree and stimulates vigorous, weakly attached regrowth. On older or stressed trees even less should be removed.

6Heading cuts (stubbing or topping) are discouraged in utility pruning primarily because they:

A.Slow regrowth too much

B.Stimulate dense, weakly attached water sprouts that grow rapidly back toward the line

C.Always kill the tree outright

D.Are prohibited by OSHA 1910.269

Explanation: Heading cuts (topping/stubbing) sever stems between nodes or to small laterals not large enough to assume apical dominance, triggering a flush of vigorous, poorly attached water sprouts. These sprouts grow rapidly back toward the conductor and increase failure risk, so directional/natural-target cuts are preferred.

7Side pruning (lateral clearance) of a tree growing beside a conductor should establish clearance based mainly on:

A.A fixed 1-foot clearance for all species

B.Species growth rate, conductor sag/sway, and the pruning cycle length

C.The homeowner's preference only

D.The height of the utility pole

Explanation: Adequate clearance must account for how fast the species grows, conductor movement (sag and sway in wind/load), and the length of the pruning cycle so the tree will not contact the line before the next visit. A single fixed distance ignores these variables and can cause early re-encroachment.

8Which species characteristic makes a tree most problematic when planted under a distribution line?

A.Slow growth and mature height under 25 feet

B.Rapid growth and large mature height

C.Shallow ornamental shrub form

D.Deciduous habit

Explanation: Fast-growing, tall-maturing (incompatible) species require frequent, severe pruning under lines and quickly re-encroach. Promoting low-growing, slow-growth species (the 'right tree, right place' principle) under and near lines reduces conflicts and pruning cost.

9When a final pruning cut creates a wound, the tree limits the spread of decay through a process called:

A.Photosynthesis

B.Compartmentalization (CODIT)

C.Transpiration

D.Cambial dieback

Explanation: Trees do not heal wounds; they wall off injured tissue through compartmentalization (CODIT - Compartmentalization Of Decay In Trees), forming chemical and physical boundaries. Proper natural-target cuts that preserve the branch collar maximize the tree's ability to compartmentalize.

10Removing a co-dominant stem with included bark near a conductor is desirable because included-bark unions are:

A.Stronger than normal branch attachments

B.Structurally weak and prone to splitting failure

C.Resistant to decay

D.Required by ANSI A300

Explanation: Included bark forms when two stems grow tightly together without a true branch collar, producing a weak union that is prone to splitting under wind, ice, or load. Near conductors such failures can drop limbs onto lines, so reducing or removing the defect lowers reliability risk.

About the ISA Utility Specialist Exam

The ISA Certified Arborist Utility Specialist is a specialty credential for arborists who manage trees and vegetation around electric utility lines. The exam has 115 multiple-choice questions (100 scored plus 15 unscored pretest items) delivered over two hours, with a 75% passing score, and requires candidates to already hold the ISA Certified Arborist credential.

Assessment

115 multiple-choice questions (100 scored plus 15 unscored pretest items), each with four options and one correct answer, delivered over two hours; 75% required to pass. This practice bank is 100 selected-response items.

Time Limit

2 hours (120 minutes)

Passing Score

75%

Exam Fee

$295 (ISA members/credential holders) or $369 (other approved applicants) (International Society of Arboriculture (ISA))

ISA Utility Specialist Exam Content Outline

29%

Electrical Knowledge

OSHA 1910.269, ANSI Z133, minimum approach distances, qualified line-clearance tree trimmers, conductor and pole identification, step potential, energized-equipment hazards, PPE, and electrical rescue

20%

Electric Utility Pruning

Directional and natural-target pruning to ANSI A300, the three-cut method, V-cuts, crown reduction, clearance specifications, growth regulators, and avoiding topping and lion-tailing

20%

Customer Relations

Customer notification and education, easement/right-of-way rights, complaint and refusal handling, storm communication, public safety messaging, municipal coordination, and the ISA Code of Ethics

18%

Integrated Vegetation Management (IVM)

Compatible vs. incompatible vegetation, wire-zone/border-zone management, selective herbicide methods and drift control, NERC FAC-003, mechanical/biological control, and pollinator habitat

13%

Program Management

Cycle-based vs. reactive maintenance, work specifications and contractor management, QA audits, SAIDI/SAIFI metrics, risk-based prioritization, recordkeeping, and budgeting

How to Pass the ISA Utility Specialist Exam

What You Need to Know

Passing score: 75%
Assessment: 115 multiple-choice questions (100 scored plus 15 unscored pretest items), each with four options and one correct answer, delivered over two hours; 75% required to pass. This practice bank is 100 selected-response items.
Time limit: 2 hours (120 minutes)
Exam fee: $295 (ISA members/credential holders) or $369 (other approved applicants)

Keys to Passing

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

ISA Utility Specialist Study Tips from Top Performers

1Weight your study toward Electrical Knowledge (29%) - master OSHA 1910.269, ANSI Z133, minimum approach distances, and the qualified line-clearance tree trimmer definition

2Memorize the unqualified-worker rule: at least 10 feet from lines 50 kV and below, adding 4 inches for every additional 10 kV

3Know the difference between directional/natural-target pruning (correct) and topping or lion-tailing (unacceptable), and when V-cuts and crown reduction apply

4Understand IVM: compatible vs. incompatible vegetation, wire-zone/border-zone management, herbicide methods (foliar, basal bark, cut-stump), and NERC FAC-003 for transmission

5Practice customer-relations scenarios: notification, easement rights, refusals, storm communication, and the ISA Code of Ethics - this is 20% of the exam

6Complete all 100 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the ISA Utility Specialist exam and how long is it?

The ISA Certified Arborist Utility Specialist exam has 115 multiple-choice questions (100 scored plus 15 unscored pretest items), each with four options and one correct answer. You have two hours (120 minutes) to complete it.

What score do I need to pass the ISA Utility Specialist exam?

The current passing score is 75 percent. Because the exam is weighted across five domains, ISA notes that the average of the domains will not equal the overall score, so balanced preparation across all five areas is important.

What are the eligibility requirements for the Utility Specialist credential?

You must already hold the ISA Certified Arborist credential and have at least 2,000 hours of verifiable utility vegetation management experience over the past two years, or 36 cumulative months of qualifying full-time utility vegetation management employment or contract work in the past 10 years.

What topics does the Utility Specialist exam cover?

It covers five weighted areas: Electric Utility Pruning (20%), Program Management (13%), Integrated Vegetation Management (18%), Electrical Knowledge (29%), and Customer Relations (20%). Electrical Knowledge is the largest single area.

How much does the ISA Utility Specialist exam cost?

The exam enrollment fee is $295 USD for ISA members and current credential holders and $369 USD for all other approved candidates, per the ISA program guide. A retake fee of $120 applies if you need to test again, and recertification costs $95 every three years.

Is this free ISA Utility Specialist practice as good as paid prep?

Our 100 practice questions cover the same five content domains as the official exam, grounded in OSHA 1910.269, ANSI Z133, ANSI A300, and IVM best practices, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.