PE Construction Exam Flashcards

Q: What is the PE Civil Construction exam pass rate?

NCEES reports a 56% first-time pass rate for the PE Civil Construction discipline exam. NCEES does not publish a separate repeat-examinee pass rate for this discipline, but repeat pass rates are typically lower across all PE Civil disciplines.

Q: How many questions are on the exam and how is it scored?

The PE Civil Construction exam has 80 total questions, including multiple-choice and alternative item types. NCEES does not publish a fixed passing score or percentage cutoff - the exam uses equated scoring, so raw score requirements can shift slightly between test forms.

Q: What references are allowed during the exam?

NCEES provides an electronic PE Civil Reference Handbook plus discipline-specific design standards for the Construction exam, such as ACI 347R (formwork), the AISC Manual, ASCE 37-14 (construction loads), and OSHA 29 CFR 1926. No personal books or notes are permitted.

Q: How soon can I retake the exam if I fail?

NCEES allows one attempt per testing window and no more than three attempts within a rolling 12-month period. Testing windows run roughly every few months, so a retake is realistically available in about 90 days; after a third failure in 12 months, a candidate must wait for an earlier attempt to age out of that window.

Q: Which topics carry the most weight on the exam?

Support of Construction Loads (12.5-18.8%) and Operations and Methods (11.3-17.5%) carry the two heaviest official weighting bands, followed by Project Planning and Scheduling, Material Production/Execution/Quality Control, and Structural Mechanics (each 8.8-13.8%). Prioritize temporary works, equipment methods, and CPM scheduling.

Question 1

Rankine active earth-pressure coefficient (Ka)

Accepted Answer

Ka = (1 - sin phi) / (1 + sin phi), where phi is the soil's friction angle. Ka gives the lateral pressure a retained soil mass exerts as it moves away from a wall or excavation support - the minimum lateral-pressure condition.

Question 2

Rankine passive earth-pressure coefficient (Kp)

Accepted Answer

Kp = (1 + sin phi) / (1 - sin phi), the reciprocal of Ka. Kp governs the much larger lateral pressure that develops when soil is pushed INTO a wall or structure - the maximum lateral resistance the soil can offer.

Question 3

Effective stress principle (Terzaghi)

Accepted Answer

Effective stress = total stress minus pore water pressure. Effective stress, not total stress, controls a soil's shear strength and consolidation behavior - critical whenever groundwater is present at an excavation or foundation.

Question 4

Factor of safety for slope stability

Accepted Answer

FS = resisting forces (or moments) divided by driving forces (or moments) along the failure surface. FS greater than 1 means a stable slope; construction cut/fill slopes are typically designed for FS of at least 1.5.

Question 5

Height of Instrument (HI) in differential leveling

Accepted Answer

HI = known benchmark elevation + backsight (BS) rod reading. HI is the elevation of the instrument's line of sight and is the reference used to find every other point's elevation from that setup.

Question 6

Finding a new point's elevation from HI

Accepted Answer

New elevation = HI minus the foresight (FS) rod reading. Unlike the backsight, which is added to find HI, the foresight is subtracted to solve for the unknown point's elevation.

Question 7

Degree of curve (arc definition) and radius

Accepted Answer

R = 5729.58 / D, where D is the degree of curve. A larger degree of curve means a sharper curve and smaller radius - used to stake horizontal curves from PC to PT during site layout.

Question 8

Purpose of potholing before excavation

Accepted Answer

Potholing (often vacuum excavation) exposes a short section of a buried utility to physically verify its exact horizontal location and depth before larger-scale excavation, reducing the risk of a utility strike from inaccurate as-built records.

Question 9

Effect of water-cement (w/c) ratio on concrete

Accepted Answer

A lower w/c ratio produces higher compressive strength and lower permeability (better durability) because less capillary porosity remains after curing - but very low w/c ratios reduce workability unless admixtures are used.

Question 10

What the slump test measures

Accepted Answer

The slump test measures the workability/consistency of fresh concrete, not its strength. A cone is filled and lifted, and the vertical drop (slump) is recorded - low slump means a stiff mix, high slump means a more fluid mix.

Question 11

Why concrete uses air entrainment

Accepted Answer

Air-entraining admixtures create microscopic air bubbles that give freeze-thaw cycling water somewhere to expand into, protecting hardened concrete from freeze-thaw and de-icer scaling damage in exposed exterior work.

Question 12

USCS (Unified Soil Classification System)

Accepted Answer

USCS classifies soils with two-letter symbols (e.g., SW, SP, CL, CH, ML) based on grain-size distribution and Atterberg limits (plasticity). It is the standard reference for describing soil suitability as fill, backfill, or foundation material.

Question 13

Earthwork swell

Accepted Answer

Swell is the volume increase that occurs when in-place (bank) soil is excavated and loosened - loose (hauled) volume exceeds bank volume. A soil with 25% swell means 1 bank cubic yard becomes 1.25 loose cubic yards once dug.

Question 14

Earthwork load factor

Accepted Answer

Load factor = bank volume divided by loose volume, always less than 1.0 for a swelling soil. It converts a hauled (loose) quantity back into equivalent in-place bank volume for payment and cut/fill balance calculations.

Question 15

Earthwork shrinkage

Accepted Answer

Shrinkage occurs when soil is placed and compacted into an embankment: the compacted volume ends up smaller than the original bank volume because compaction increases density beyond the natural in-situ state - the opposite direction of swell.

Question 16

Purpose of a mass haul diagram

Accepted Answer

A mass haul diagram plots cumulative cut-minus-fill volume against station along an alignment. It identifies balance points (where cut equals fill), the most economical haul direction and distance, and where waste or borrow is needed.

Question 17

CPM total float formula

Accepted Answer

Total Float = Late Start minus Early Start = Late Finish minus Early Finish (LS - ES = LF - EF). It is the amount an activity can slip without delaying the project's overall completion date.

Question 18

CPM free float, distinguished from total float

Accepted Answer

Free float is the amount an activity can be delayed without delaying the early start of its very next successor activity - a narrower, more local measure than total float, which protects the whole project's finish date.

Question 19

Definition of the critical path

Accepted Answer

The critical path is the longest continuous chain of dependent activities through the network diagram. Every activity on it has zero total float, so delaying any one of them delays the entire project's completion date.

Question 20

What 'crashing' a schedule means

Accepted Answer

Crashing shortens one or more critical-path activity durations - typically by adding labor, equipment, or overtime - which increases direct costs but can reduce overall project duration. Time-cost tradeoff analysis finds the least-cost way to compress the schedule.

Question 21

FS, SS, FF, and SF precedence relationships

Accepted Answer

Finish-to-Start (FS): successor starts after predecessor finishes - the default relationship. Start-to-Start (SS): successor can start once predecessor starts. Finish-to-Finish (FF): successor can't finish until predecessor finishes. Start-to-Finish (SF): successor can't finish until predecessor starts - rare.

Question 22

What a Proctor test establishes

Accepted Answer

The Proctor test determines the maximum dry density and corresponding optimum moisture content a soil can achieve under a standardized compactive effort in the lab. Field compaction specs (e.g., '95% Standard Proctor') are checked against this reference curve.

Question 23

How a nuclear density gauge is used in the field

Accepted Answer

A nuclear density gauge quickly measures in-place soil density and moisture content on site using a radioactive source, letting inspectors verify a lift meets its Proctor-based compaction spec without waiting on lab test results.

Question 24

What the concrete maturity method estimates

Accepted Answer

The maturity method (ASTM C1074) estimates in-place concrete strength by combining a pour's temperature history over time into a maturity index, calibrated against lab strength curves - commonly used to decide when forms can safely be stripped.

Question 25

Purpose of a concrete cylinder break test

Accepted Answer

Field-cast cylinders are cured similarly to the structure and tested in compression - typically at 28 days, often with an early 7-day check - to verify the concrete mix meets the specified compressive strength for acceptance.

Question 26

Verifying bolt and weld quality in the field

Accepted Answer

Bolted connections are checked with a torque or turn-of-nut method to confirm proper clamping (pretension) force. Welds are verified with nondestructive testing (visual, ultrasonic, radiographic, or magnetic-particle) against acceptance criteria such as AWS D1.1.

Question 27

Bending stress formula

Accepted Answer

Sigma = Mc / I, where M is bending moment, c is the distance from the neutral axis to the extreme fiber, and I is the section's moment of inertia. It gives the maximum normal stress from flexure at a given cross-section.

Question 28

Shear stress formula in a beam

Accepted Answer

Tau = VQ / (Ib), where V is shear force, Q is the first moment of area above (or below) the point of interest, I is the moment of inertia, and b is the section width at that point.

Question 29

Dead load vs. construction load

Accepted Answer

Dead load is the permanent self-weight of the finished structure. Construction load is a temporary load present only during erection - formwork, wet concrete, equipment, stored material, workers - that can exceed the structure's final in-service loading and must be checked separately.

Question 30

What a deflection check verifies

Accepted Answer

Deflection is a serviceability limit state, not a strength limit state - it confirms a member stays within code or owner deflection limits (e.g., L/360 under live load) to prevent cracking, ponding, or occupant discomfort, even if the member is strong enough to avoid failure.

Question 31

Combined axial and bending stress

Accepted Answer

Total stress at a point = axial stress plus or minus bending stress = P/A +/- Mc/I, using superposition. Essential for members like shoring posts or formwork studs that carry both direct compression and eccentric (bending) loads simultaneously.

Question 32

Rational Method formula for peak runoff

Accepted Answer

Q = CiA, where Q is peak discharge, C is a runoff coefficient based on surface type, i is rainfall intensity for the time of concentration, and A is the drainage area. Used for small drainage areas in temporary drainage and erosion-control design.

Question 33

Manning's equation for open-channel flow

Accepted Answer

V = (1.49/n) x R^(2/3) x S^(1/2) in US customary units, where n is the channel's roughness coefficient, R is the hydraulic radius, and S is the channel slope. Used to size temporary ditches, channels, and culverts.

Question 34

Time of concentration (Tc)

Accepted Answer

Tc is the time for runoff to travel from the hydraulically most distant point in a drainage area to the point of analysis. A longer Tc generally corresponds to a lower design rainfall intensity used in Rational Method calculations.

Question 35

Why crane capacity isn't one fixed number

Accepted Answer

A mobile crane's lifting capacity varies with boom length, boom angle, and lift radius (plus configuration and counterweight). Operators and riggers must always read the allowable capacity from the manufacturer's load chart for that specific radius - never the nameplate maximum.

Question 36

Outrigger ground-bearing pressure check

Accepted Answer

Before a crane pick, the ground-bearing pressure under each outrigger pad must be checked against the soil's allowable bearing capacity, using mats or cribbing to spread the load if needed - a critical setup check to prevent settlement or tip-over.

Question 37

Wellpoint dewatering vs. sump pumping

Accepted Answer

A wellpoint system uses a header pipe with vacuum-connected points to lower the groundwater table proactively over a broad area before excavation begins. Sump pumping is reactive - it collects and removes water that has already entered a localized low point in the excavation.

Question 38

Drilled shaft vs. driven pile

Accepted Answer

A drilled shaft is installed by auguring/excavating a hole (with casing or slurry support if needed) and then placing reinforcement and concrete. A driven pile is a prefabricated member driven into the ground by an impact or vibratory hammer. Choice depends on soil conditions, vibration/noise limits, and required capacity.

Question 39

Equipment production-rate formula

Accepted Answer

Production rate is approximately load/bucket capacity times cycles per hour times an efficiency (job) factor. Cycle time (load, haul, dump, return) and job efficiency - soil conditions, operator skill, downtime - both directly drive achievable output and fleet-sizing decisions.

Question 40

Purpose of a borrow pit

Accepted Answer

A borrow pit is an off-site (or designated on-site) fill source used when a project's cut volume can't meet its fill needs. It is the counterpart to a waste/spoil area, which is used when cut volume exceeds what's needed for fill.

Question 41

Formwork vs. falsework

Accepted Answer

Formwork is the temporary mold that shapes fresh concrete and resists its lateral (hydrostatic-like) pressure until it gains strength. Falsework is the temporary structural support system - shoring towers, bents - that carries the load of the formwork, wet concrete, or an unfinished structure.

Question 42

What shoring supports, versus bracing

Accepted Answer

Shoring is a temporary system carrying vertical and/or lateral loads from a structure, excavation wall, or adjacent property during construction. Bracing instead provides lateral stability against wind, seismic, or unbalanced forces - a vertically strong system can still rack or overturn without adequate bracing.

Question 43

What reshoring is for

Accepted Answer

Reshoring is the reinstallation of shores beneath a concrete member after the original formwork/shoring was removed early (often to speed up form reuse), continuing to carry the member's weight and any construction loads until the concrete gains enough strength to support itself.

Question 44

What determines formwork lateral pressure

Accepted Answer

Fresh concrete behaves like a fluid initially, so formwork lateral pressure increases with the rate of placement (pour rate) and concrete unit weight, and decreases as concrete temperature rises (faster set). ACI 347R provides design pressure guidance based on these factors.

Question 45

The three OSHA excavation protective-system types

Accepted Answer

OSHA 1926 Subpart P recognizes three protective-system types: sloping/benching (cutting the wall back at a safe angle), shoring (installing supports like hydraulic shores), and shielding (using a trench box/shield to protect workers without necessarily supporting the soil).

Question 46

Purpose of support-of-excavation (SOE) systems

Accepted Answer

Support-of-excavation systems - sheet piling, soldier piles with lagging, slurry walls - retain an adjacent soil face so excavation can proceed safely next to property lines, existing structures, or utilities where simply sloping the wall back isn't feasible.

Question 47

Bracing's specific structural role

Accepted Answer

Bracing resists lateral (horizontal) forces - wind, seismic, or unbalanced pressure - to keep a structure, formwork system, or temporary works from racking or overturning, complementing formwork and shoring, which primarily handle concrete shape and vertical/soil loads.

Question 48

OSHA excavation protective-system depth triggers

Accepted Answer

Under OSHA 1926 Subpart P, a protective system (sloping, shoring, or shielding) is required for excavations 5 feet deep or greater, except in stable rock. Excavations deeper than 20 feet require the protective system to be designed by a registered professional engineer.

Question 49

OSHA soil classifications and maximum slope angles

Accepted Answer

Type A soil (most stable, e.g., stiff clay) allows a maximum slope of about 3/4:1 (53 degrees); Type B (medium stability) allows 1:1 (45 degrees); Type C (least stable, e.g., saturated or granular soil) requires 1.5:1 (about 34 degrees) - steeper allowable angles go with more stable soil.

Question 50

OSHA fall-protection height triggers and the competent-person requirement

Accepted Answer

Fall protection is generally required at 6 feet for most construction work and at 10 feet for scaffold platforms. A competent person must also inspect excavations and other hazards before each shift begins and as conditions change (OSHA 1926.651(k)(1)); documentation is best practice but not explicitly required by Subpart P.

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