PE Civil Exam Flashcards

Q: Is the PE Civil exam one test, or do I choose a discipline?

Since April 2024, PE Civil is five standalone 80-question discipline exams (Construction, Geotechnical, Structural, Transportation, and Water Resources & Environmental) with no shared breadth section. A candidate registers for and sits ONE discipline exam, chosen based on their practice area.

Q: What is the PE Civil pass rate?

Pass rates vary widely by discipline. Per NCEES data updated January 2026, first-time pass rates are: Construction 56%, Geotechnical 61%, Structural 58%, Transportation 55%, and Water Resources & Environmental 68%. Repeat-examinee pass rates are meaningfully lower in every discipline.

Q: How soon can I retake a PE Civil discipline exam if I fail?

NCEES limits candidates to one attempt per testing window and no more than three attempts in a rolling 12-month period; testing windows are commonly described as roughly three months, so a retake is realistically available in about 90 days, though NCEES does not publish one universal day count and some boards are stricter. After a third failure within 12 months, a candidate must wait for the earliest of those attempts to age out of the 12-month window - in practice close to a full year - before trying again.

Q: Do I need an employer to sponsor my PE Civil registration?

No employer or firm sponsorship is required. You register directly through your MyNCEES account once your state licensing board has approved your eligibility (education, the FE exam, and qualifying experience).

Q: What reference material is allowed during the PE Civil exam?

Only the NCEES-supplied electronic PE Civil Reference Handbook, plus any discipline-specific design standards NCEES lists for that exam (for example ACI 318, the AISC Manual, or AASHTO for Structural). No personal books, notes, or other references are permitted.

Q: Which discipline should these flashcards help me review?

This deck is a cross-discipline foundation - 10 cards from each of the 5 disciplines - not a substitute for a discipline-specific deck. Candidates preparing for one specific discipline exam should pair this overview with deeper, discipline-focused review of their chosen area's full blueprint.

Question 1

What is 'bank volume' in earthwork, and how does it differ from loose volume after excavation?

Accepted Answer

Bank volume is the in-place, undisturbed volume of soil before it is disturbed. Loose volume is that same soil after excavation, expanded by air voids introduced during digging. The swell factor (loose ÷ bank, always greater than 1) converts between the two.

Question 2

A contractor excavates 10,000 bank cubic yards (BCY) with a swell factor of 1.25. How many loose cubic yards (LCY) must be hauled?

Accepted Answer

LCY = BCY x swell factor = 10,000 x 1.25 = 12,500 LCY. Always multiply bank volume by the swell factor to size trucking, since excavated soil takes up more space than it did in place.

Question 3

What is the shrinkage factor, and why is compacted volume usually LESS than bank volume?

Accepted Answer

Shrinkage factor = compacted volume ÷ bank volume, and it is typically less than 1. Compaction closes air voids left by the natural in-place soil structure, so a given bank volume yields less volume once recompacted in a fill.

Question 4

In a CPM schedule, how do you calculate Total Float for an activity?

Accepted Answer

Total Float = LS - ES (equivalently LF - EF). It is the amount an activity can slip without delaying the overall project finish date.

Question 5

How does Free Float differ from Total Float, and how is it calculated?

Accepted Answer

Free Float = the successor activity's early start (ES) minus this activity's early finish (EF). It measures delay tolerance without pushing ANY downstream activity, whereas Total Float measures delay tolerance without pushing the PROJECT finish.

Question 6

What defines the 'critical path' in a CPM network?

Accepted Answer

The longest path of activities from project start to finish. Every activity on it has zero total float, so any delay to a critical activity delays the entire project's completion date.

Question 7

In Earned Value Management, define Planned Value (PV), Earned Value (EV), and Actual Cost (AC).

Accepted Answer

PV is the budgeted cost of work that was scheduled to be done by now. EV is the budgeted cost of work actually performed. AC is the real cost incurred to perform that work. All EVM performance indices are built from these three values.

Question 8

How are Cost Performance Index (CPI) and Schedule Performance Index (SPI) calculated, and what does CPI below 1.0 mean?

Accepted Answer

CPI = EV / AC and SPI = EV / PV. CPI under 1.0 means the project is over budget (money spent exceeds the value of work earned); SPI under 1.0 means the project is behind schedule.

Question 9

At what excavation depth does OSHA require a protective system such as shoring, sloping, or shielding?

Accepted Answer

5 feet is OSHA's trigger depth requiring a protective system in trenches and excavations, with the required system depending on the soil's Type A (most stable), B, or C (least stable, e.g., saturated or previously disturbed) classification.

Question 10

Distinguish formwork, falsework, and shoring as temporary construction structures.

Accepted Answer

Formwork is the mold that shapes wet concrete. Falsework is the temporary structure supporting concrete placement or erection work (such as bridge segments) until it becomes self-supporting. Shoring is vertical or lateral support that prevents collapse of an excavation or an existing structure.

Question 11

In the Unified Soil Classification System (USCS), what do the letters G, S, M, and C represent?

Accepted Answer

G = gravel and S = sand, the coarse-grained soils (more than 50% retained on the No. 200 sieve). M = silt and C = clay, the fine-grained soils. Secondary letters (W/P for gradation, H/L for plasticity) refine each group further.

Question 12

How is the Plasticity Index (PI) calculated, and what does a high PI indicate?

Accepted Answer

PI = Liquid Limit (LL) minus Plastic Limit (PL). A high PI signals a highly plastic, compressible, moisture-sensitive clay (like CH) prone to significant volume change and reduced strength when wet.

Question 13

Write the Terzaghi bearing capacity equation and identify what each factor represents.

Accepted Answer

qult = cNc + qNq + 0.5gammaBNgamma. Nc captures the contribution from soil cohesion, Nq from surcharge/overburden pressure, and Ngamma from the soil's unit weight and footing width (self-weight of the failure wedge).

Question 14

How do you convert ultimate bearing capacity (qult) into an allowable design value (qallow)?

Accepted Answer

qallow = qult / FS, where the factor of safety (commonly 2.5-3.0 for shallow foundations) accounts for uncertainty in soil parameters and keeps service loads well below the bearing failure threshold.

Question 15

What is the effective stress equation, and why does it govern soil behavior rather than total stress?

Accepted Answer

sigma' = sigma - u (total stress minus pore water pressure). Effective stress is the grain-to-grain contact stress that actually resists deformation, so it governs shear strength and consolidation - not the total stress, which includes the water's weight.

Question 16

Define void ratio (e) and explain what a high void ratio suggests about a soil.

Accepted Answer

e = Vv / Vs, the volume of voids over the volume of solids. A high void ratio indicates a loose, more compressible soil with greater settlement potential than a dense, low-void-ratio soil.

Question 17

Rank the lateral earth pressure coefficients Ka, K0, and Kp from smallest to largest, and state the condition that produces each.

Accepted Answer

Ka (active, wall moves away from the soil) < K0 (at-rest, no wall movement) < Kp (passive, wall pushes into the soil). Passive pressure is always largest because the soil is being compressed rather than allowed to expand.

Question 18

For a pile foundation, distinguish skin friction from end bearing as sources of capacity.

Accepted Answer

Skin friction (shaft resistance) develops along the pile's embedded side length; end bearing develops at the pile tip on firm strata. Total pile capacity is the sum of both, with the dominant component depending on the soil profile and pile type.

Question 19

What soil condition is required for liquefaction to occur, and why?

Accepted Answer

Loose, saturated, cohesionless (sandy) soil subjected to rapid loading such as an earthquake. Pore pressure builds faster than it can dissipate, driving effective stress toward zero so the soil behaves like a fluid and loses bearing and shear strength.

Question 20

How does consolidation settlement differ from immediate (elastic) settlement in fine-grained soils?

Accepted Answer

Immediate settlement occurs quickly from elastic deformation. Consolidation settlement in saturated clays happens slowly over time as excess pore water is squeezed out under load, letting the soil skeleton compress - this time-dependent behavior is what geotechnical engineers must predict for clay-supported structures.

Question 21

What is the governing basic LRFD load combination for gravity loads under ASCE 7?

Accepted Answer

1.2D + 1.6L (plus other applicable factored loads such as 0.5Lr, S, or R) typically governs ordinary gravity design. The 1.2 factor reflects lower dead-load uncertainty and the 1.6 factor reflects the greater variability of live load.

Question 22

What is the ASD basic gravity combination, and how does it differ conceptually from LRFD?

Accepted Answer

D + L, using unfactored service-level loads. ASD compares those service loads against an allowable stress that already has one built-in safety factor, while LRFD factors loads up and resistance down as two separate steps.

Question 23

For which PE Civil structural material must a candidate use ASD rather than LRFD?

Accepted Answer

Wood design. NCEES specifications require ASD for timber, while steel and concrete problems may be worked using either ASD or LRFD depending on the design standard referenced in the question.

Question 24

What is 'tributary area,' and how does it set the load on a structural member?

Accepted Answer

The portion of floor or roof area that structurally drains its load to a specific supporting member (beam, column, or footing). Multiplying tributary area by the load per square foot gives that member's design load.

Question 25

What is the mathematical relationship between the shear diagram and the moment diagram along a beam?

Accepted Answer

The moment diagram is the integral of the shear diagram (dM/dx = V); equivalently, the shear diagram is the slope of the moment diagram. Moment is maximum where the shear diagram crosses zero.

Question 26

Write the flexure (bending) stress formula for a beam and define each term.

Accepted Answer

f = 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. Equivalently f = M/S using section modulus S = I/c.

Question 27

What is the maximum deflection formula for a simply supported beam with a single center point load P, span L, modulus E, and moment of inertia I?

Accepted Answer

delta max = PL^3 / (48EI), occurring at midspan. Because deflection scales with the CUBE of span length, span is the dominant variable controlling deflection.

Question 28

Under ACI 318, what strength-reduction (phi) factor applies to a tension-controlled reinforced concrete flexural member?

Accepted Answer

phi = 0.9, the highest reduction factor in the code. Tension-controlled sections yield in the reinforcing steel well before the concrete crushes, producing ductile, predictable failure with warning before collapse.

Question 29

What is 'development length' in reinforced concrete design, and why is it required?

Accepted Answer

The embedment length of reinforcing bar needed to transfer force between the bar and surrounding concrete through bond stress, preventing the bar from pulling out before it reaches its design (yield) stress.

Question 30

State the basic LRFD design inequality used in AISC steel design and contrast it with the ASD inequality.

Accepted Answer

LRFD: phi*Rn >= sum(gamma_i * Q_i) - factored resistance must exceed factored load effects. ASD: Rn / Omega >= sum(Q_i) - nominal resistance divided by a safety factor must exceed unfactored service loads.

Question 31

On a horizontal curve, what do the points PC, PI, and PT represent?

Accepted Answer

PC (Point of Curvature) is where the curve begins and the incoming tangent ends. PI (Point of Intersection) is where the two tangents would meet if extended. PT (Point of Tangency) is where the curve ends and the next tangent begins.

Question 32

What is the Stopping Sight Distance (SSD) formula, and what two components does it combine?

Accepted Answer

SSD = 1.47*V*t + V^2 / (30*(f +/- G)), combining (1) reaction/perception distance (1.47*V*t, V in mph, t about 2.5 seconds) and (2) braking distance, adjusted for friction f and grade G (uphill increases required distance, downhill decreases the braking term's demand).

Question 33

What is the basic superelevation design equation relating superelevation rate (e), side-friction factor (f), design speed (V, mph), and curve radius (R, ft)?

Accepted Answer

e + f = V^2 / (15R). Superelevation and side friction together supply the centripetal force that keeps a vehicle on the curve at design speed.

Question 34

Why does a crest vertical curve use daytime stopping sight distance while a sag curve uses headlight sight distance?

Accepted Answer

On a crest, the road surface itself blocks the line of sight over the high point, so daytime SSD governs. On a sag there is no daytime obstruction, so at night the limiting factor is how far the vehicle's headlight beam reaches ahead.

Question 35

What does Level of Service (LOS) measure in traffic engineering, and how many grades does it use?

Accepted Answer

LOS is a qualitative A-through-F grading (per the Highway Capacity Manual) of traffic flow quality, based on measures like density, speed, and delay - A is free flow and F is breakdown/gridlock.

Question 36

Define the volume-to-capacity (v/c) ratio and explain what a v/c ratio above 1.0 means.

Accepted Answer

v/c = actual traffic volume divided by the roadway's maximum capacity. A v/c ratio above 1.0 means demand exceeds capacity, producing oversaturated flow, queuing, and LOS F conditions.

Question 37

What is the Peak Hour Factor (PHF), and what does a PHF close to 1.0 indicate?

Accepted Answer

PHF = hourly volume / (4 x peak 15-minute volume), measuring how uniformly traffic is distributed within the peak hour. A PHF near 1.0 means steady flow across the hour; a low PHF means traffic is concentrated in a short, intense burst.

Question 38

What two components make up a signal's 'clearance interval,' and what is its purpose?

Accepted Answer

The yellow (change) interval plus the all-red interval. Together they give a vehicle already in the intersection time to clear before conflicting traffic receives a green, preventing right-angle collisions.

Question 39

What does ESAL (Equivalent Single Axle Load) measure, and why is it central to pavement design?

Accepted Answer

ESAL converts mixed traffic (cars, trucks, and buses with varying axle loads) into an equivalent number of standard 18,000-lb single-axle load repetitions, which pavement design methods use to size pavement thickness for cumulative traffic damage over the design life.

Question 40

In AASHTO flexible pavement design, what does the Structural Number (SN) represent?

Accepted Answer

A composite index of the overall structural capacity required from the pavement's combined layers (surface, base, subbase), built from each layer's thickness, layer coefficient, and drainage coefficient - a higher SN means a thicker or stronger pavement section.

Question 41

Write the Rational Method formula for peak runoff and define each variable.

Accepted Answer

Q = CiA, where Q is peak flow rate, C is the runoff coefficient (dimensionless), i is rainfall intensity (in/hr) at the time of concentration, and A is drainage area (acres). It is best suited to small watersheds, roughly under 200 acres.

Question 42

What does the runoff coefficient (C) in the Rational Method represent, and what land cover raises it?

Accepted Answer

C is the fraction of rainfall that becomes surface runoff rather than infiltrating or being stored. Impervious surfaces (pavement, rooftops) push C toward 1.0; permeable, vegetated, or sandy soils lower it.

Question 43

What is 'time of concentration' (Tc), and why does it matter in the Rational Method?

Accepted Answer

Tc is the time for runoff to travel from the hydraulically most distant point in the watershed to the point of analysis. Design rainfall intensity is selected at a duration equal to Tc, since that produces the peak flow for the watershed's response time.

Question 44

When would an engineer choose the SCS/NRCS curve number method over the Rational Method?

Accepted Answer

For larger or more complex watersheds, or when a full runoff hydrograph is needed rather than just a peak flow value - the SCS/NRCS method uses a soil- and land-cover-based curve number to generate a complete time-distributed hydrograph.

Question 45

Write Manning's equation for open-channel flow and state what the roughness coefficient (n) represents.

Accepted Answer

Q = (1.49/n) * A * R^(2/3) * S^(1/2) in US units, where A is flow area, R is hydraulic radius, and S is channel slope. The coefficient n describes channel surface friction - a higher n means a rougher channel and lower velocity.

Question 46

What is the Hazen-Williams equation used for, and how does its application differ from Manning's equation?

Accepted Answer

Hazen-Williams estimates head loss and velocity in closed, pressurized pipe flow (such as water distribution mains) using a C-coefficient for pipe roughness, whereas Manning's equation applies to gravity-driven open-channel flow.

Question 47

What does the Darcy-Weisbach equation calculate, and what does its friction factor depend on?

Accepted Answer

It calculates head loss due to friction in pipe flow: hf = f*(L/D)*(V^2/2g). The friction factor f depends on both pipe roughness and Reynolds number (flow regime), making Darcy-Weisbach more general than Hazen-Williams.

Question 48

State the Bernoulli equation's core principle for incompressible fluid flow along a streamline.

Accepted Answer

The sum of pressure head, velocity head, and elevation head is constant along a streamline (ignoring losses): p/gamma + V^2/2g + z = constant - an expression of conservation of energy in flowing fluid.

Question 49

What does the Froude number indicate about open-channel flow, and what does Fr = 1 represent?

Accepted Answer

The Froude number distinguishes subcritical flow (Fr less than 1: slow, deep, gravity-dominated) from supercritical flow (Fr greater than 1: fast, shallow, inertia-dominated). Fr = 1 is critical flow, the boundary between the two regimes.

Question 50

List the standard water treatment train in order, and define BOD.

Accepted Answer

Coagulation, then flocculation, then sedimentation, then filtration, then disinfection. BOD (Biochemical Oxygen Demand) measures the oxygen consumed by microorganisms breaking down organic matter in water - a key indicator of wastewater's organic pollution strength.

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