What is the primary purpose of a tree risk assessment under the ISA TRAQ methodology?
Principles And Levels
Question · Easy
Which level of tree risk assessment involves a 360-degree, walk-around visual inspection of a tree and its surrounding site from the ground?
A drive-by survey of street trees to quickly spot obvious defects in many trees best describes which assessment level?
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Using a resistance-recording drill or sonic tomography to quantify internal decay in a trunk is an example of which type of assessment?
Which ANSI A300 standard part specifically addresses tree risk assessment practices?
Question · Medium
In the TRAQ process, why must the assessor establish a defined assessment time frame at the start of the inspection?
Before beginning a tree risk assessment, the assessor should first establish which of the following?
The TRAQ credential is valid for how long before it must be renewed?
Which credential is an acceptable prerequisite to register for the TRAQ course and exam?
What are the three components combined to derive a final tree risk rating in the TRAQ matrix system?
Risk Categorization Matrix
In the TRAQ method, the four categories used to rate the likelihood of failure are:
A tree part for which failure has already begun or is most likely to occur in the near future is rated as which likelihood of failure?
The likelihood of failure rating of 'Probable' is best defined as:
Likelihood of impact in the TRAQ matrix primarily depends on which factor?
Targets And Consequences
An occupancy rate described as a target present in the target zone nearly all the time (such as an occupied house or a busy highway) is classified as:
What is the 'target zone' in a tree risk assessment?
In TRAQ, the four categories used to rate the consequences of failure are:
Consequences of failure that involve serious personal injury or major structural property damage are rated as:
Matrix 1 in the TRAQ system combines which two inputs?
The output of Matrix 1 (the combined likelihood of failure and impact) is expressed using which set of terms?
Matrix 2 produces the final risk rating by combining the Matrix 1 result with which factor?
The four possible final risk ratings produced by the TRAQ method are:
A tree part with 'Very likely' combined likelihood of failure and impact, and 'Severe' consequences, receives which final risk rating?
A tree part with 'Very likely' combined likelihood but only 'Negligible' consequences receives which final risk rating?
Why is the risk analysis section of the ISA Basic Tree Risk Assessment Form designed to be repeated for a single tree?
Documentation And Reporting
Which part of a tree's structure transports water and minerals upward and provides much of the wood's mechanical strength?
Tree Biology And Biomechanics
The process by which trees compartmentalize decay, limiting its spread through chemical and physical boundaries, is known as:
A union where included bark is embedded between two stems is structurally concerning because:
Two stems of roughly equal diameter arising from about the same point with no clear dominant leader are called:
When assessing decay in a hollow stem, which guideline relates the strength loss to the proportion of sound wood remaining?
Question · Hard
The protective swelling at the base of a branch that should be preserved when pruning, and whose damage can invite decay, is the:
Reaction wood that forms on the underside of leaning branches in conifers to help support the load is called:
A tree with a recent, abrupt lean and soil heaving or cracking on one side of the root plate most likely indicates:
The presence of fruiting bodies (conks or mushrooms) on a trunk or root flare is significant in risk assessment because they:
Which crown condition increases the wind load on a tree and can raise the likelihood of failure?
Likelihood Of Failure And Loads
Wind load on a tree is best described as which type of mechanical load?
The continuous downward force of the tree's own mass, especially in heavy horizontal limbs, is an example of a:
A crack that extends deep into the wood and is open, particularly when found with decay or at a weak union, is significant because it:
Why does a long, heavily end-weighted lateral limb have a higher likelihood of failure than a short one of the same diameter?
Recently exposed trees that grew up in a dense stand and are suddenly left standing alone after surrounding trees are removed are at increased risk because:
Which site condition most directly reduces a tree's anchoring and increases the likelihood of whole-tree (root) failure?
When evaluating likelihood of failure, an assessor should consider the load on the part relative to:
Which of the following is considered a target in a tree risk assessment?
A movable target such as a parked car or a portable picnic table is significant because:
How does a higher target occupancy rate affect the risk assessment?
Consequences of failure are influenced by all of the following EXCEPT:
A small dead twig overhanging a rarely used footpath would most likely be rated with which consequences of failure?
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