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AZ ROC A (KA) Dual Engineering study materials
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AZ ROC A (KA) Dual Engineering practice questions

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Question 1Business Management and Law

Under Arizona contractor licensing rules, a licensed contractor must notify the Registrar of Contractors of a change in the business's primary address within how many days of the change?

  1. 30 days
  2. 15 days Correct answer.
  3. 60 days
  4. 90 days

Explanation

Arizona rules require licensees to report specified changes, including a change of business address, to the Registrar within 15 days. Prompt notice keeps the license record current so the Registrar can reach the licensee.

Question 2Business Management and Law

A contractor's license is classified as a dual engineering classification. Which statement best describes the scope of work such a license authorizes?

  1. Both commercial and residential engineering-related construction within the licensed classifications Correct answer.
  2. Only work on public highway projects
  3. Only work under a separate general contractor's supervision
  4. Only residential remodeling work

Explanation

A dual engineering classification allows the licensee to perform both commercial and residential work within the engineering-related classifications it holds. The scope is defined by the specific classifications rather than limited to one project type.

Question 3Business Management and Law

In Arizona, a contractor licensed in the residential classification enters a written contract with a homeowner for a project valued at $4,000. Which requirement applies to this contract under the residential contracting statutes?

  1. The contract must be notarized by both parties
  2. No written contract is required below $5,000
  3. The contract must be in writing and signed by the parties Correct answer.
  4. The contract must be filed with the Registrar before work begins

Explanation

Arizona requires residential remodeling and repair contracts above a small statutory threshold to be in writing and signed by the parties. Notarization and pre-filing with the Registrar are not general requirements.

Question 4Business Management and Law

Which document typically establishes the priority between a construction lender's deed of trust and mechanic's lien claimants on a private project in Arizona?

  1. The owner's certificate of occupancy
  2. The recorded deed of trust and the timing of lien recording Correct answer.
  3. The notice of completion
  4. The contractor's license bond

Explanation

Priority between a lender's deed of trust and mechanic's liens generally turns on recording dates and the statutory rules governing when liens attach. A lien recorded before the deed of trust can gain priority over the lender.

Question 5Business Management and Law

Arizona contractors are required to maintain workers' compensation coverage for employees. What is the consequence for a licensed contractor who fails to maintain required coverage?

  1. The contractor must double the license bond
  2. No consequence applies if no injury occurred
  3. The license may be suspended or disciplined Correct answer.
  4. The contractor receives only a written warning

Explanation

Failure to carry required workers' compensation insurance is grounds for disciplinary action, including suspension of the license. The obligation exists regardless of whether an injury has occurred.

Question 6Business Management and Law

An owner and contractor disagree over the meaning of a contract clause. A court applying Arizona contract interpretation rules will generally give effect to which meaning?

  1. The contractor's subjective intent
  2. The meaning that favors the owner
  3. The objective meaning of the words as reasonably understood by the parties Correct answer.
  4. The meaning proposed by the party who drafted the clause regardless of clarity

Explanation

Arizona follows the objective theory of contract interpretation, giving effect to the reasonable meaning of the language rather than a party's undisclosed intent. Extrinsic evidence is generally considered only when the language is ambiguous.

Question 7Business Management and Law

A subcontractor has not been paid by the general contractor for work performed on a private commercial project. Which step is most directly required to preserve the subcontractor's mechanic's lien rights in Arizona?

  1. Notifying the Registrar of Contractors of the dispute
  2. Recording the subcontract with the county recorder
  3. Filing a lawsuit immediately upon nonpayment
  4. Recording a lien within the statutory period after completion and serving required notices Correct answer.

Explanation

Mechanic's lien rights are preserved by serving any required preliminary notices and recording the lien within the statutory period measured from completion. A lawsuit comes later, after the lien is recorded.

Question 8Business Management and Law

Under Arizona law, which of the following best describes the purpose of the contractor's license bond required for licensure?

  1. To guarantee the contractor completes every project on schedule
  2. To provide a fund for certain claimants harmed by the contractor's license law violations Correct answer.
  3. To pay the contractor's subcontractors automatically upon default
  4. To insure the contractor against property damage on the job

Explanation

The license bond exists to protect persons harmed by a licensee's violation of the contracting statutes, up to the bond amount. It is not a performance bond or a general liability policy.

Question 9Business Management and Law

A contractor signs a contract with a homeowner that includes a clause waiving the homeowner's right to file a complaint with the Registrar of Contractors. How is such a clause treated under Arizona law?

  1. It is enforceable if the homeowner initials it
  2. It is enforceable if printed in bold
  3. It is unenforceable because the right to complain cannot be waived Correct answer.
  4. It is enforceable only for contracts over $50,000

Explanation

Arizona law prohibits provisions that waive a party's ability to file a complaint with the Registrar. Such clauses are void regardless of formatting or initials.

Question 10Business Management and Law

Which of the following is the correct description of the Arizona Registrar of Contractors' authority over licensed contractors?

  1. It can only issue licenses and cannot investigate complaints
  2. It sets the prices contractors may charge
  3. It can investigate complaints and impose discipline including suspension or revocation Correct answer.
  4. It can award money damages to homeowners in civil court

Explanation

The Registrar licenses contractors and investigates complaints, with authority to impose discipline such as suspension, revocation, or probation. It does not set prices or act as a civil court.

Question 11Business Management and Law

A general contractor discovers that a subcontractor's employee was injured on site and the subcontractor lacks workers' compensation coverage. What is the general exposure for the general contractor under Arizona workers' compensation law?

  1. Automatic criminal liability for the injury
  2. No exposure because the injured worker was not its employee
  3. Liability limited to the amount of the license bond
  4. Potential liability as a statutory employer for the uninsured worker Correct answer.

Explanation

Arizona's workers' compensation scheme can treat a general contractor as a statutory employer responsible for workers of uninsured subcontractors. This encourages prime contractors to verify subcontractor coverage.

Question 12Business Management and Law

In Arizona, a contractor's written contract with a homeowner must generally include which of the following to comply with the residential contracting statutes?

  1. A copy of the contractor's tax return
  2. The contractor's license number Correct answer.
  3. A notarized signature of the lender
  4. The contractor's social security number

Explanation

Residential contracts must include the contractor's license number along with other required disclosures. Personal identifiers such as a social security number and tax returns are not required contract contents.

Question 13Business Management and Law

A contractor is licensed as a sole proprietor and later incorporates the business. What must the contractor do to keep the license valid for the new entity?

  1. Nothing, because the license follows the owner automatically
  2. Transfer the bond to the corporation without notifying the Registrar
  3. Apply for a new or reissued license reflecting the changed business structure Correct answer.
  4. Wait until the next renewal cycle to report the change

Explanation

A license is issued to a specific legal entity, so a change in business structure requires the licensee to obtain a license reflecting the new entity. Failing to do so can result in unlicensed contracting.

Question 14Business Management and Law

Which of the following best describes the function of a notice of completion recorded by a property owner in Arizona?

  1. It transfers title to the contractor
  2. It starts the clock for certain lien and stop-notice deadlines Correct answer.
  3. It terminates the construction contract automatically
  4. It releases the contractor's license bond

Explanation

Recording a notice of completion triggers statutory deadlines, including the period within which lien claimants must act. It does not transfer title or terminate the contract.

Question 15Business Management and Law

A homeowner and contractor enter an agreement with a clause requiring all disputes to be resolved by binding arbitration. Which statement is accurate under Arizona law?

  1. Arbitration clauses are void in construction contracts
  2. Arbitration clauses are enforceable only if the Registrar approves them
  3. Arbitration clauses eliminate the homeowner's right to complain to the Registrar
  4. Arbitration clauses are generally enforceable if the agreement meets contract formation requirements Correct answer.

Explanation

Arizona generally enforces valid arbitration agreements as a matter of contract, subject to ordinary formation defenses. Arbitration does not eliminate the separate right to file a complaint with the Registrar.

Question 16Business Management and Law

Which of the following is a required element for a valid construction contract under general Arizona contract law?

  1. Approval by the Registrar
  2. A performance bond
  3. A notary seal
  4. An offer, acceptance, and consideration Correct answer.

Explanation

A valid contract requires an offer, acceptance, and consideration, along with capacity and lawful purpose. Notarization, Registrar approval, and bonding are not general formation elements.

Question 17Business Management and Law

A contractor's employee negligently damages a neighbor's property while hauling materials to a job site. Under what theory is the contractor most likely liable for the employee's conduct?

  1. Strict liability
  2. Breach of warranty
  3. Quantum meruit
  4. Respondeat superior Correct answer.

Explanation

Under respondeat superior, an employer is liable for torts committed by an employee within the scope of employment. The contractor is therefore generally liable for the employee's negligent acts on the job.

Question 18Business Management and Law

Arizona requires contractors to include certain disclosures in advertisements. Which of the following must a licensed contractor include when advertising contracting services?

  1. The contractor's home address
  2. The contractor's annual revenue
  3. The contractor's license number Correct answer.
  4. The names of the contractor's employees

Explanation

Licensed contractors must include their license number in advertisements for contracting services. This lets consumers verify licensure with the Registrar.

Question 19Business Management and Law

A subcontractor's bid is accepted by a general contractor, but before the contract is signed the general contractor revokes the acceptance. Under general contract principles applied in Arizona, which statement is most accurate?

  1. The revocation is effective because no contract was signed
  2. The revocation is ineffective if the acceptance formed a binding contract Correct answer.
  3. The subcontractor has no remedy under any theory
  4. The bid can never form a contract until a purchase order issues

Explanation

A contract is formed when acceptance is communicated, not when a formal document is signed. If the acceptance created a binding agreement, a later revocation is ineffective and may be a breach.

Question 20Business Management and Law

Which of the following best describes Arizona's requirement regarding the handling of construction funds by a licensed contractor?

  1. Construction funds must be used for the project for which they were received Correct answer.
  2. Construction funds may be commingled without restriction
  3. Construction funds may be used for any business expense
  4. Construction funds must be held in escrow by the Registrar

Explanation

Arizona law requires that funds received for a construction project be applied to that project. Misapplication of construction funds can support discipline and other remedies.

Question 21Business Management and Law

A contractor's license lapses because the contractor failed to renew it on time. The contractor continues to perform work during the lapse. What is the contractor's legal position?

  1. The contractor remains licensed because renewal is a formality
  2. The contractor is licensed as long as the work is residential
  3. The contractor is licensed if the bond remains in force
  4. The contractor is treated as unlicensed and may face discipline and loss of certain remedies Correct answer.

Explanation

Operating after a license lapses constitutes contracting without a license, exposing the contractor to discipline and potentially limiting the ability to recover compensation. An expired license is not cured by the bond or by the type of work.

Question 22Business Management and Law

In Arizona, which of the following is generally true regarding the enforceability of a liquidated damages clause in a construction contract?

  1. Liquidated damages clauses are enforceable if the amount is a reasonable forecast of probable loss Correct answer.
  2. Liquidated damages clauses are always void as penalties
  3. Liquidated damages clauses are enforceable only in residential contracts
  4. Liquidated damages clauses require Registrar approval

Explanation

A liquidated damages clause is enforceable when the stipulated amount is a reasonable estimate of anticipated harm and actual damages would be difficult to determine. If it operates as a penalty, it is unenforceable.

Question 23Business Management and Law

Which party typically bears the responsibility for obtaining building permits on a construction project unless the contract states otherwise?

  1. The owner
  2. The subcontractor
  3. The design professional
  4. The general contractor Correct answer.

Explanation

Unless the contract allocates the duty differently, the general contractor typically obtains the building permits for the work. Clear contract language should confirm who is responsible.

Question 24Business Management and Law

A contractor's employee is injured on the job, and the contractor carries workers' compensation insurance. What is the general effect of that coverage on the employee's ability to sue the employer for the injury?

  1. The employee may sue only if the injury exceeds $100,000
  2. The employee may sue the employer in tort as if no coverage existed
  3. The employee may sue the employer only in federal court
  4. The employee's exclusive remedy against the employer is generally the workers' compensation claim Correct answer.

Explanation

Workers' compensation is generally the exclusive remedy against the employer for work-related injuries, in exchange for no-fault benefits. Tort claims against the employer are ordinarily barred.

Question 25Business Management and Law

A contractor is asked to sign a contract containing an indemnity clause that would require the contractor to indemnify the owner for the owner's own negligence. How should the contractor analyze this clause under Arizona law?

  1. Such clauses are automatically void in all circumstances
  2. Such clauses are always enforceable as written
  3. Such clauses may be limited or unenforceable depending on statutory and public policy constraints Correct answer.
  4. Such clauses are enforceable only if handwritten

Explanation

Arizona limits indemnity provisions that purport to indemnify a party for its own negligence, particularly in construction contracts. The clause must be evaluated against those statutory and public policy limits rather than assumed valid or void.

Question 26Business Management and Law

Under Arizona law, what is the primary purpose of the Arizona Registrar of Contractors (ROC) licensing requirement for contractors?

  1. To generate revenue for the state through licensing fees
  2. To ensure contractors have sufficient insurance coverage
  3. To protect the public from unqualified or dishonest contractors Correct answer.
  4. To promote fair competition among licensed contractors

Explanation

The Arizona Legislature created the ROC to protect the public health, safety, and welfare by licensing and regulating contractors. The licensing system aims to ensure that contractors meet minimum qualifications and adhere to standards, thereby safeguarding consumers.

Question 27Business Management and Law

Which of the following is a duty of the Arizona Registrar of Contractors?

  1. Investigating complaints against licensed contractors Correct answer.
  2. Setting building code standards for all municipalities
  3. Providing legal representation to homeowners in disputes
  4. Issuing building permits for construction projects

Explanation

The ROC has statutory authority to investigate complaints against licensed contractors and take disciplinary action if violations are found. It does not issue building permits, set building codes, or provide legal representation.

Question 28Business Management and Law

In Arizona, a contractor's license may be disciplined by the ROC for which of the following reasons?

  1. Refusing to use subcontractors for all work
  2. Failing to complete a project within the original estimated time
  3. Charging a price higher than the original bid
  4. Abandoning a construction project without legal excuse Correct answer.

Explanation

Abandonment of a project without legal excuse is a violation of Arizona contractor licensing laws and can lead to disciplinary action, including license suspension or revocation. Other options are not necessarily violations unless they breach specific contractual or statutory duties.

Question 29Business Management and Law

What is the maximum amount of the contractor's license bond required for a licensed contractor in Arizona, as set by statute?

  1. $10,000
  2. $5,000
  3. $15,000 Correct answer.
  4. $20,000

Explanation

Arizona Revised Statutes § 32-1152 requires a contractor's license bond in the amount of $15,000 for residential contractors and $15,000 for commercial contractors. The bond is intended to provide a source of recovery for persons harmed by certain violations.

Question 30Business Management and Law

Which of the following best describes the purpose of the Recovery Fund administered by the Arizona Registrar of Contractors?

  1. To pay for legal defense of contractors in disciplinary actions
  2. To fund continuing education programs for contractors
  3. To compensate homeowners for damages caused by licensed contractors Correct answer.
  4. To provide loans to contractors for business expansion

Explanation

The Recovery Fund is a fund from which the ROC may pay up to a statutory maximum to homeowners who obtain a judgment against a licensed contractor for certain violations but are unable to collect. It is not a loan program, education fund, or legal defense fund.

Question 31Business Management and Law

A licensed contractor in Arizona is required to notify the ROC within how many days of a change in the contractor's business address?

  1. 30 days Correct answer.
  2. 60 days
  3. 10 days
  4. 90 days

Explanation

Under A.R.S. § 32-1122, a licensee must notify the Registrar in writing within thirty days of any change in the licensee's business address, trade name, or other information required on the license application.

Question 32Business Management and Law

Which of the following is a requirement for obtaining a contractor's license in Arizona?

  1. Passing a written examination on business and law Correct answer.
  2. Possessing a four-year college degree in construction management
  3. Having a minimum of five years of experience in the trade
  4. Owning all equipment necessary to perform the work

Explanation

Applicants for a contractor's license must pass a written examination that covers business management and law, as well as trade-specific knowledge. Experience requirements exist but are typically four years, not five, and a college degree is not required.

Question 33Business Management and Law

A contractor's license is classified as which of the following under Arizona law?

  1. A privilege granted by the state Correct answer.
  2. A local government authorization
  3. A fundamental right protected by the Constitution
  4. A contractual agreement between the contractor and the ROC

Explanation

A contractor's license is a privilege granted by the state, subject to regulation and revocation for cause. It is not a fundamental right, a contract, or a local authorization.

Question 34Business Management and Law

Which of the following is an unfair or deceptive practice under the Arizona Consumer Fraud Act as applied to contractors?

  1. Requiring a deposit before starting work
  2. Failing to disclose a known defect in materials to be used Correct answer.
  3. Advertising a discount for senior citizens
  4. Providing a written estimate that later changes due to unforeseen conditions

Explanation

The Arizona Consumer Fraud Act prohibits deceptive or unfair practices, including concealing material facts. Failing to disclose a known defect in materials is a deceptive practice. The other options are not inherently deceptive.

Question 35Business Management and Law

In Arizona, which of the following is true regarding the enforceability of a non-compete clause in an employment contract for a contractor's key employee?

  1. Non-compete clauses are enforceable only if the employee is terminated for cause.
  2. Non-compete clauses are enforceable only if the employee is an owner.
  3. Non-compete clauses are enforceable if they are reasonable in scope and duration. Correct answer.
  4. Non-compete clauses are per se unenforceable in Arizona.

Explanation

Arizona courts enforce non-compete agreements if they are reasonable in scope, duration, and geographic area, and if they protect a legitimate business interest. They are not per se unenforceable, nor limited to owners or terminations for cause.

Question 36Business Management and Law

A contractor enters into a contract with a homeowner that includes a provision requiring the homeowner to pay the contractor's attorney fees in any dispute, regardless of outcome. Under Arizona law, how is this provision likely to be treated?

  1. It is enforceable as written because parties are free to contract.
  2. It is enforceable only if the contractor prevails in the dispute.
  3. It is enforceable only if the homeowner is represented by counsel.
  4. It is unenforceable because it is unconscionable. Correct answer.

Explanation

Arizona courts may refuse to enforce one-sided attorney fee provisions in consumer contracts if they are unconscionable. However, under A.R.S. § 12-341.01, in a contract action, the court may award fees to the prevailing party, but a clause that requires the homeowner to pay the contractor's fees regardless of outcome is likely unconscionable.

Question 37Business Management and Law

Which of the following is a valid reason for the ROC to deny a contractor's license application?

  1. The applicant has been convicted of a felony related to contracting Correct answer.
  2. The applicant has not completed a college degree
  3. The applicant has not lived in Arizona for at least one year
  4. The applicant has no prior experience in the construction industry

Explanation

The ROC may deny a license if the applicant has been convicted of a felony that relates to the practice of contracting, as this bears on the applicant's fitness. Lack of experience, residency, and education are not statutory grounds for denial.

Question 38Business Management and Law

A contractor licensed in Arizona as a partnership dissolves the partnership and continues the business as a corporation. What must the contractor do to maintain a valid license?

  1. Surrender the existing license and cease operations for one year.
  2. Notify the ROC of the change within 30 days and request a license transfer.
  3. Apply for a new license under the corporation's name. Correct answer.
  4. Nothing, because the license is held by the individual partners.

Explanation

A contractor's license is issued to a specific legal entity. If the business structure changes, the new entity must obtain its own license; the license cannot be transferred. The contractor must apply for a new license.

Question 39Business Management and Law

Under Arizona law, which of the following is true regarding the ROC's authority to impose civil penalties on a licensed contractor?

  1. The ROC may impose civil penalties only for repeat violations.
  2. The ROC may impose civil penalties without a hearing if the contractor agrees.
  3. The ROC has no authority to impose civil penalties; only courts can.
  4. The ROC may impose civil penalties only after a hearing. Correct answer.

Explanation

The ROC must provide notice and an opportunity for a hearing before imposing civil penalties, as required by due process. The other options misstate the law.

Question 40Business Management and Law

Which of the following is a requirement for a contractor to qualify for a license under a different business name in Arizona?

  1. The contractor must obtain approval from the local building department.
  2. The contractor must register the trade name with the Arizona Secretary of State. Correct answer.
  3. The contractor must post a larger license bond.
  4. The contractor must have a separate license for each business name.

Explanation

If a contractor wishes to do business under a name other than its legal name, it must register the trade name with the Arizona Secretary of State and provide proof to the ROC. A separate license is not required for each trade name if the underlying entity is the same.

Question 41Site Work, Excavation, and Earthwork

What is the primary purpose of a bench (berm) left in an excavation wall?

  1. To mark the property boundary of the excavation
  2. To provide a level surface for surveying equipment
  3. To control raveling and protect workers from falling material Correct answer.
  4. To reduce the volume of soil that must be hauled off site

Explanation

Benching reduces the hazard of soil raveling and falling debris by breaking up the face of an excavation into steps. It is a protective measure tied to soil stability and worker safety, not a surveying or boundary function.

Question 42Site Work, Excavation, and Earthwork

Before digging in an area with known underground utilities, what step should be taken first?

  1. Backfill the area to bring it to grade
  2. Compact the surface soil to stabilize it
  3. Call the utility locating service to mark buried lines Correct answer.
  4. Begin trenching and watch for utility markers

Explanation

A locate request through the one-call notification system must be made before excavation so buried utilities are marked. Digging first and watching for markers exposes crews to struck-line hazards.

Question 43Site Work, Excavation, and Earthwork

In soil classification, what does the term 'bank measure' refer to?

  1. The volume of soil after it has been excavated and loosened
  2. The volume of soil in its natural, undisturbed state Correct answer.
  3. The volume of soil loaded into a haul truck
  4. The volume of soil after it has been compacted in place

Explanation

Bank measure is the volume of soil in its natural, in-place condition before excavation. Excavated material swells, and compacted fill shrinks, so bank measure is the baseline for quantity takeoffs.

Question 44Site Work, Excavation, and Earthwork

What is the purpose of a silt fence around the perimeter of a disturbed site?

  1. To support the sides of shallow trenches
  2. To keep site personnel out of stockpile areas
  3. To intercept sheet flow and trap sediment before it leaves the site Correct answer.
  4. To retain groundwater behind the excavation

Explanation

Silt fence is a perimeter sediment control device that slows sheet flow and allows sediment to settle out before runoff leaves the site. It is not a structural or dewatering element.

Question 45Site Work, Excavation, and Earthwork

What does the term 'cut and fill' describe in earthwork operations?

  1. Removing topsoil and replacing it with select fill
  2. Balancing excavated material from high areas against fill needed in low areas Correct answer.
  3. Excavating rock and hauling it off site
  4. Cutting trenches and backfilling them with the same soil

Explanation

Cut and fill balances material excavated from higher areas against fill required in lower areas to reach design grade. A balanced site minimizes hauling and import or export of soil.

Question 46Site Work, Excavation, and Earthwork

What is the standard purpose of a compaction test (such as a nuclear density gauge reading) on structural fill?

  1. To verify the slope of the finished grade
  2. To measure the depth of the water table
  3. To confirm the fill has reached the specified relative density Correct answer.
  4. To determine the color and texture of the soil

Explanation

Density testing verifies that placed and compacted fill meets the specified percentage of maximum dry density. It is a quality control step tied to the compaction specification.

Question 47Site Work, Excavation, and Earthwork

What is the most common reason to dewater an excavation?

  1. To increase the bearing capacity of the subgrade
  2. To speed up the curing of concrete footings
  3. To allow work to proceed in the dry and maintain stable side slopes Correct answer.
  4. To reduce the amount of imported fill required

Explanation

Dewatering lowers the water level so excavation and construction can occur in dry, stable conditions. Standing water softens subgrade and destabilizes excavation walls.

Question 48Site Work, Excavation, and Earthwork

An excavation 6 feet deep is made in Type B soil. Using the typical OSHA slope requirement of 1:1 for Type B, how wide must the excavated top be if the bottom is 6 feet wide?

  1. 18 feet Correct answer.
  2. 6 feet
  3. 12 feet
  4. 24 feet

Explanation

A 1:1 slope means the horizontal offset equals the vertical depth on each side, so each side adds 6 feet. Adding 6 feet on both sides to a 6-foot bottom gives an 18-foot top width.

Question 49Site Work, Excavation, and Earthwork

A trench requires 1,200 cubic yards of backfill measured in compacted condition. The soil has a shrinkage factor of 15 percent from bank to compacted. How many bank cubic yards must be excavated?

  1. 1,412 bank cubic yards Correct answer.
  2. 1,380 bank cubic yards
  3. 1,200 bank cubic yards
  4. 1,020 bank cubic yards

Explanation

Bank volume equals compacted volume divided by the compacted-to-bank factor (1 minus shrinkage). 1,200 divided by 0.85 equals about 1,412 bank cubic yards.

Question 50Site Work, Excavation, and Earthwork

Why is a trench shield (trench box) sometimes preferred over sloping in a confined urban work area?

  1. It reduces the required excavation width and protects workers from cave-in Correct answer.
  2. It eliminates the need for a competent person on site
  3. It permits workers to enter soil classified as Type C without any limits
  4. It allows the trench to be backfilled before the work is complete

Explanation

A shield protects workers while allowing near-vertical trench walls, which minimizes the excavation footprint in tight spaces. A competent person is still required, and shields must be installed per the manufacturer's tabulated data.