CENEVAL EGEL Plus Ingeniería Civil (EGEL Plus ICIVIL)

In a unit price analysis (APU) for a structural concrete footing, the direct material cost is $1,800 MXN/m³, direct labor cost is $450 MXN/m³, and direct equipment and tool cost is $150 MXN/m³. The project specifications establish an indirect cost rate of 15%, a financing charge of 2%, and a contractor profit margin of 10%, applied successively to accumulated subtotals according to Mexican public works regulations (RLOPSRM). What is the final unit price per cubic meter?

• A$3,096.72 MXN/m³
• B$3,048.00 MXN/m³
• C$2,760.00 MXN/m³
• D$3,240.00 MXN/m³

A construction schedule network has four alternative paths from project start to finish: Path A with duration 15 days, Path B with duration 17 days, Path C (Activity 1 → 4 → 6) with durations 4, 9, and 6 days (total 19 days), and Path D with duration 18 days. What is the total project duration and which path governs the schedule?

• A19 days along Path C (the critical path)
• B18 days along Path D
• C17 days along Path B
• D21 days along Path C

During a standard slump test (ASTM C143 / NMX-C-156-ONNCCE), a freshly mixed batch of pumpable concrete for an elevated slab exhibits a slump of 12 cm. What characteristic of the fresh concrete does this measurement directly evaluate?

• AConsistency and workability for placement
• BCompressive strength at 28 days of curing
• CTotal volume of entrained air voids
• DModulus of elasticity of the hardened concrete

A concrete mix design specifies 350 kg/m³ of Portland cement, an effective design water-cement (w/c) ratio of 0.50, and dry aggregates totaling 1,750 kg/m³. If the aggregate stockpiles on site contain 4% surface moisture (free water) above their absorption capacity, how much batching water must be metered per cubic meter of concrete at the plant?

• A105 kg/m³
• B175 kg/m³
• C245 kg/m³
• D140 kg/m³

Under NOM-031-STPS-2011 (Construcción - Condiciones de seguridad y salud en el trabajo), trench walls must be stabilized with elements that project 20 cm above the ground surface when the trench depth is greater than which value?

• A1.50 m
• B1.20 m
• C0.90 m
• D2.00 m

A hydraulic excavator equipped with a 1.20 m³ bucket has a bucket fill factor of 0.90, a cycle time of 30 seconds, and an operational efficiency of 50 minutes per hour (83.3%). If the excavated soil has a swell factor of 1.20 (loose volume is 1.20 times bank volume), what is the estimated hourly production rate in bank cubic meters (m³/h)?

• A90 m³/h
• B108 m³/h
• C129.6 m³/h
• D75 m³/h

Under the Mexican Public Works and Related Services Law (LOPSRM) and its regulations, which component of a unit price analysis covers general corporate administration, central office staff, site office overhead, and technical supervision?

• AIndirect costs (Costos indirectos)
• BDirect costs (Costos directos)
• CFinancing charges (Costo por financiamiento)
• DAdditional charges (Cargos adicionales)

In a project CPM network, Activity E has an Early Start (ES) of day 14, an Early Finish (EF) of day 22, a Late Start (LS) of day 18, and a Late Finish (LF) of day 26. Its sole successor, Activity F, has an Early Start (ES) of day 24. What are the Total Float (TF) and Free Float (FF) of Activity E?

• ATotal Float = 4 days; Free Float = 2 days
• BTotal Float = 2 days; Free Float = 4 days
• CTotal Float = 4 days; Free Float = 0 days
• DTotal Float = 8 days; Free Float = 4 days

In the laboratory design of hot-mix asphalt using the Marshall method (ASTM D6927), what property is evaluated by recording the maximum load sustained by a compacted cylindrical specimen loaded diametrically at 60 °C?

• AMarshall stability
• BMarshall flow
• CAir void ratio
• DResilient modulus

What is the primary technical objective of keeping freshly cast hydraulic concrete continuously moist during its first days (moist curing)?

• ATo maintain moisture and temperature conditions favoring continuous cement hydration and…
• BTo accelerate initial setting time so formwork can be stripped immediately
• CTo encourage rapid evaporation of bleed water from the slab surface
• DTo minimize compressive strength variability caused by fine aggregate gradation

In Mexican public works administration, what is the official, legally binding record kept for each contract in which the residente de obra, the contractor's superintendente and, where applicable, the supervisión register instructions, approvals, modifications, and notices during execution?

• ABitácora de obra (Construction logbook)
• BCatálogo de conceptos (Bill of quantities)
• CPrograma de obra (Master Gantt schedule)
• DMemoria descriptiva (Descriptive engineering report)

A masonry crew consists of 1 master mason earning $600 MXN/day and 1 helper earning $350 MXN/day. The contractor provides a 10% safety and hand tool allowance on base wages. If the crew achieves a daily production rate of 14 m² of concrete block wall per 8-hour shift, what is the direct labor cost per square meter?

• A$74.64 MXN/m²
• B$67.86 MXN/m²
• C$72.14 MXN/m²
• D$130.63 MXN/m²

Under the Mexico City Complementary Technical Norms for concrete structures (NTC-Concreto), what minimum specified compressive strength (f'c) is required for Clase 1 structural concrete, the class that must be used in Group A and B1 buildings?

• A250 kg/cm² (25 MPa)
• B150 kg/cm² (15 MPa)
• C200 kg/cm² (20 MPa)
• D100 kg/cm² (10 MPa)

NOM-031-STPS-2011 defines 'trabajos en altura' (work at heights), which must also comply with NOM-009-STPS-2011, as activities performed at heights greater than which value above the reference level?

• A1.80 m
• B1.20 m
• C1.50 m
• D0.90 m

In aggregate testing for concrete (ASTM C136 / NMX-C-077-ONNCCE), the fineness modulus (FM) of fine aggregate is computed from cumulative percentages retained on standard sieves. What is the standard acceptable FM range for natural sand to provide proper mix cohesion and pumpability?

• A2.3 to 3.1
• B1.2 to 1.8
• C3.5 to 4.2
• D4.5 to 5.5

In Mexican public works contract management, what does an 'estimación de obra' represent?

• AA contractual progress valuation certifying executed work quantities verified on site aga…
• BThe initial competitive financial bid presented during the tender submission
• CA preliminary engineering cost estimate prepared during the feasibility phase
• DA contractor claim requesting financial compensation for inflationary steel price adjustm…

Which compaction equipment is most effective for densifying cohesive, high-plasticity clay soils in highway embankments and clay liners?

• ATamping foot (sheepsfoot) roller
• BSmooth steel drum vibratory roller
• CLight pneumatic-tired roller
• DWalk-behind vibratory plate compactor

An hourly equipment rate (including machine depreciation, fuel, lubricants, preventive maintenance, and the operator's burdened salary) is calculated at $800 MXN/hr. If the equipment achieves a verified job site output of 20 m³/hr on a mass earth excavation item, what is the direct equipment cost per cubic meter?

• A$40.00 MXN/m³
• B$16.00 MXN/m³
• C$50.00 MXN/m³
• D$60.00 MXN/m³

Under standard specifications for formwork stripping (desimbrado), vertical forms on column sides may be stripped within 24 to 48 hours, but bottom soffit forms and falsework supporting suspended slabs and beams must remain in place until which technical condition is satisfied?

• AThe in-situ concrete achieves at least 70% to 80% of its specified 28-day design strength…
• BExactly 28 calendar days have elapsed regardless of field-cured test cylinder results
• CThe concrete core temperature equilibrates with the ambient temperature
• DSubsequent floor finishes have been placed and cured

In a CPM project schedule network, what is the fundamental defining characteristic of an activity located on the critical path?

• AIt has a Total Float of zero, meaning any delay directly extends the overall project comp…
• BIt represents the most hazardous construction operation requiring specialized safety over…
• CIt is the single activity with the highest direct financial cost in the project budget
• DIt is an activity that can be executed independently without any prerequisite tasks

A simply supported reinforced concrete girder with an effective span of L = 6.0 m carries a total factored uniformly distributed load of w = 30 kN/m across its entire span. What is the maximum factored bending moment (Mu) acting on the girder?

• A135.0 kN·m
• B540.0 kN·m
• C90.0 kN·m
• D270.0 kN·m

A singly reinforced concrete beam has an effective depth d = 500 mm and width b = 250 mm. The factored ultimate bending moment is Mu = 120 kN·m. Using Grade 420 rebar (fy = 420 MPa), a strength reduction factor phi = 0.90, and an internal moment lever arm estimated as j × d = 0.90 × d = 450 mm, what is the required tension reinforcement area (As)?

• A705.5 mm²
• B634.9 mm²
• C907.0 mm²
• D571.4 mm²

At a depth of 5.0 m in a saturated sandy soil deposit, the total vertical overburden stress is calculated as sigma = 95.0 kPa. The water table is located at the ground surface, and the unit weight of water is gamma_w = 9.81 kN/m³. What is the vertical effective stress (sigma') at this depth?

• A45.95 kPa
• B95.00 kPa
• C144.05 kPa
• D49.05 kPa

A continuous strip footing of width B = 2.0 m is founded at a depth Df = 1.5 m in a cohesive-frictional soil with cohesion c = 20 kPa and total unit weight gamma = 18 kN/m³. Terzaghi bearing capacity factors for this friction angle are Nc = 17.7, Nq = 7.4, and Ngamma = 5.0. Using Terzaghi's equation for a continuous strip footing (q_ult = c·Nc + gamma·Df·Nq + 0.5·gamma·B·Ngamma), what is the ultimate bearing capacity q_ult?

• A643.8 kPa
• B553.8 kPa
• C733.8 kPa
• D289.8 kPa

A fine-grained soil specimen has a Liquid Limit (LL) of 45% and a Plastic Limit (PL) of 20%. Under the Unified Soil Classification System (USCS / ASTM D2487), where the Casagrande A-line is defined by PI = 0.73 × (LL - 20), what is the classification of this soil?

• ACL (Lean clay / inorganic clay of low to medium plasticity)
• BML (Inorganic silt of low plasticity)
• CCH (Fat clay / inorganic clay of high plasticity)
• DMH (Elastic silt of high plasticity)

A structural steel column has a cross-sectional moment of inertia I = 8.0 × 10⁶ mm⁴ and an unbraced length L = 4.0 m with pinned ends (effective length factor K = 1.0). Given steel elastic modulus E = 200,000 MPa, what is the theoretical Euler elastic critical buckling load (Pcr)?

• A986.96 kN
• B3,947.84 kN
• C1,973.92 kN
• D246.74 kN

Under the Mexico City Building Code Complementary Technical Norms for Seismic Design (NTC-Sismo), what is the primary structural role of the seismic behavior factor (Q, factor de comportamiento sísmico)?

• ATo reduce elastic seismic forces by accounting for the structure's ductile inelastic ener…
• BTo amplify base shear to account for lacustrine clay site amplification
• CTo increase design wind forces on flexible tall structures
• DTo calculate torsional moments from accidental asymmetric live loads

In a consolidated-undrained (CU) triaxial test on a saturated normally consolidated clay, the effective stress Mohr-Coulomb failure envelope passes through the origin with an effective friction angle φ' = 30° (c' = 0). If the effective minor principal stress at failure is σ'₃ = 100 kPa, what is the effective major principal stress (σ'₁) at failure?

• A300.0 kPa
• B200.0 kPa
• C450.0 kPa
• D173.2 kPa

A reinforced concrete beam has width b = 300 mm and effective depth d = 500 mm. Factored shear force is Vu = 180 kN and concrete shear strength is Vc = 127.5 kN. If the shear strength reduction factor is φ = 0.75, what is the nominal shear strength (Vs) that must be provided by transverse stirrups (such that φ(Vc + Vs) ≥ Vu)?

• A112.5 kN
• B52.5 kN
• C84.3 kN
• D240.0 kN

In Mexico City's geotechnical Zone III (lacustrine clay deposits characterized by high water content, high compressibility, and regional subsidence), which foundation system compensates building loads by matching excavated soil weight to superstructure weight?

• ACompensated box foundation (Cimentación compensada por cajón)
• BIsolated spread footings with shallow tie beams
• CUnreinforced masonry continuous footings
• DShort friction timber piles terminating in soft upper clay

At a monthly cut-off, a building contract shows an earned value (EV) of MXN 450,000, an actual cost (AC) of MXN 500,000, and a planned value (PV) of MXN 480,000. What are the cost performance index (CPI) and schedule performance index (SPI), and what do they indicate?

• ACPI = 0.90 and SPI ≈ 0.94: the work is over budget and behind schedule
• BCPI ≈ 1.11 and SPI ≈ 1.07: the work is under budget and ahead of schedule
• CCPI = 0.90 and SPI ≈ 1.07: the work is over budget but ahead of schedule
• DCPI ≈ 0.96 and SPI = 0.90: the work is nearly on budget but behind schedule

Under AISC 360 and NTC-Acero specifications, how is an I-shaped wide-flange steel beam classified if the width-to-thickness ratios (b/t and h/tw) of its flanges and web do not exceed the limiting slenderness ratio λp?

• ACompact section, capable of developing the full plastic moment Mp before local buckling o…
• BNon-compact section, where flange local buckling occurs in the inelastic range
• CSlender section, governed strictly by elastic local plate buckling
• DLateral-torsionally unbraced section

A compacted subgrade layer must reach 95% relative compaction with respect to the laboratory maximum dry density from the Proctor test, 1.84 t/m³. A field density test (sand cone) gives a dry density of 1.71 t/m³. What is the relative compaction, and is the layer accepted?

• A92.9%; rejected, so the layer must be reworked (moisture adjusted and recompacted)
• B107.6%; accepted
• C92.9%; accepted because it exceeds 90%
• D95.0%; accepted at the specified limit

According to Rankine's earth pressure theory for a dry, cohesionless backfill with a horizontal ground surface and an internal friction angle φ = 30°, what is the coefficient of active lateral earth pressure (Ka)?

• A0.333
• B0.500
• C3.000
• D0.577

In reinforced concrete column design under NTC-CDMX and ACI 318, what is the primary structural role of closely spaced transverse ties or continuous spiral reinforcement?

• ATo provide lateral confinement to the concrete core, prevent outward buckling of longitud…
• BTo carry primary vertical compression loads in lieu of longitudinal rebar
• CTo seal the column against atmospheric moisture penetration
• DTo facilitate formwork stripping within 12 hours

In a 1D consolidation (oedometer) test on a normally consolidated clay, the initial void ratio is e₀ = 1.20 and the compression index is Cc = 0.30. When effective vertical overburden stress increases from an initial stress σ'₀ = 100 kPa to σ'f = 200 kPa, what is the reduction in void ratio (Δe)?

• A0.0903
• B0.1500
• C0.3000
• D0.0410

A sanitary sewer serves a projected population of 16,000 inhabitants with an average wastewater flow of 30.0 L/s. Using Harmon's peaking factor M = 1 + 14 / (4 + √P), with P in thousands of inhabitants, what maximum instantaneous flow should the sewer be designed to carry?

• A82.5 L/s
• B33.2 L/s
• C52.5 L/s
• D30.0 L/s

A structural drawing specifies cement 'CPC 30 R' under NMX-C-414-ONNCCE. What does this designation mean?

• APortland composite cement of strength class 30 (at least 30 MPa at 28 days) with rapid ea…
• BOrdinary Portland cement with a 28-day strength of 30 kg/cm² that is resistant to sulfates
• CPozzolanic Portland cement for concrete with a maximum cement content of 30 kg/m³
• DPortland cement with blast-furnace slag that reaches 30 MPa at 3 days and has low heat of…

A circular end-bearing drilled shaft of diameter D = 0.50 m is seated onto hard basalt bedrock with an ultimate bearing capacity qp = 8,000 kPa. If side skin friction is neglected and a factor of safety FS = 3.0 is specified, what is the allowable axial compressive load (Q_allow)?

• A523.6 kN
• B1,570.8 kN
• C785.4 kN
• D392.7 kN

A town of 20,000 inhabitants is assigned a water allocation (dotación) of 200 L/inhabitant/day. Using CONAGUA's daily variation coefficient CVd = 1.40, what is the maximum daily demand (gasto máximo diario) for designing the supply line?

• A64.81 L/s
• B46.30 L/s
• C100.46 L/s
• D5,600 L/s

A four-sided lot is surveyed with the coordinates A (100, 100), B (160, 100), C (160, 140) and D (100, 180), in meters, listed in order around the boundary. Using the coordinate (shoelace) method, what is the area of the lot?

• A3,600 m²
• B7,200 m²
• C4,800 m²
• D2,400 m²

In a building's cold-water installation supplied by gravity from a rooftop tank (tinaco), a fixture valve is 6.0 m below the water surface in the tank. Neglecting friction losses, what static pressure is available at the valve (γ = 9.81 kN/m³)?

• A58.9 kPa (about 0.6 kg/cm²)
• B6.0 kPa (about 0.06 kg/cm²)
• C588.6 kPa (about 6.0 kg/cm²)
• D29.4 kPa (about 0.3 kg/cm²)

In geotechnical site investigations (ASTM D1586 / NMX-C-431-ONNCCE), what does the Standard Penetration Test blow count (N-value) physically represent?

• AThe sum of hammer blows required to drive the split-spoon sampler the final 30 cm (two 15…
• BThe blows required to seat the sampler through the initial 15 cm disturbed zone
• CThe total depth in meters penetrated per 100 blows of the drop hammer
• DThe unconfined compressive strength in MPa directly read from the drill rig

A horizontal curve on a Mexican highway has a radius R = 286.48 m. Using the SCT definition of degree of curvature (the central angle subtended by a 20 m arc, Gc = 1,145.92 / R), what is Gc?

• A4°00'
• B2°00'
• C20°00'
• D0°04'

A moist soil specimen has a total volume V = 1.0 m³, total moist mass M = 1,900 kg, and gravimetric moisture content w = 20%. Using g = 9.81 m/s², what is the dry unit weight (γd) of the soil?

• A15.53 kN/m³
• B18.64 kN/m³
• C14.91 kN/m³
• D22.37 kN/m³

A rectangular open channel with bed width b = 3.0 m conveys water at a uniform normal depth y = 1.5 m. The longitudinal channel slope is S = 0.0016 and Manning's roughness coefficient is n = 0.015. Using Manning's equation (V = (1/n) × R^(2/3) × S^(1/2)), what is the flow velocity?

• A2.20 m/s
• B3.49 m/s
• C2.67 m/s
• D2.31 m/s