UPSC ESE /Gate ( Civil engineering)
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Channel Posts
Q3/3: A rectangular tank of length 4 m containing water accelerates uniformly at 3 m/s2 horizontally on a level surface. The difference in water surface levels between the rear and front ends is:
| 2 | Q2/3: A vertical cut in saturated clay (phi = 0) has cohesion c = 30 kN/m2 and unit weight gamma = 19 kN/m3. The depth of the tension crack (where active earth pressure becomes zero) is: | 70 |
| 3 | Q1/3: A flat slab with 400x400 mm interior column has effective depth d = 250 mm and factored shear force Vu = 800 kN. As per IS 456 Cl 31.6.3, the punching shear stress on the critical section (perimeter at d/2 from column face) is: | 63 |
| 4 | π ESE Cracker β Day 76/174: Curve Setting (Simple, Compound & Reverse Curves) π Surveying
Tuesday = Surveying day. Curves ka poora game ek image mein β formulas, worked examples aur self-check trick.
π‘ Key: deflection angle from PC to any point = arc/2 β at PT total deflection MUST equal Ξ/2. Agar nahi aa raha, setting-out galat hai.
β
Simple: T = R tan(Ξ/2), Ξ΄ = 1718.9l/R min
β
Compound: same direction, different R β PCC joins the arcs
β
Reverse: opposite direction β parallel tracks d = (R1+R2)(1βcosΞ)
#ESEPrep #CivilEngineering #SyllabusCrusher #ESE2027 #Surveying | 88 |
| 5 | A circular curve of radius 300 m has a deflection angle of 60 degrees. As per Rankine's method, the external distance of the curve (mid-point of curve to intersection of tangents) is: | 100 |
| 6 | A 3 x 3 pile group has 600 mm diameter piles at 1.8 m centre-to-centre spacing. As per the Converse-Labarre formula, the pile group efficiency is: | 96 |
| 7 | A singly reinforced beam (M20, Fe 415) has b = 250 mm, d = 400 mm and 1.0% tension steel. As per IS 456 Table 19, the design shear strength of the concrete section (Vc) is: | 92 |
| 8 | π ESE Cracker β Day 75/174
π RCC β Singly Reinforced Beam Design (IS 456:2000, LSM)
Today's cracker covers:
β’ When a beam stays singly reinforced (Mu β€ Mu,lim gate)
β’ xu,max/d ladder β 0.53 (Fe250) / 0.48 (Fe415) / 0.46 (Fe500)
β’ Mu,lim = 0.138 fck b dΒ² (Fe415) + full lever-arm equation set
β’ Worked design: Mu = 120 kNΒ·m, M20/Fe415 β b 250 mm, D 500 mm, 3-20Ο, 8Ο-4L stirrups @ 200 c/c (all arithmetic verified)
β’ Shear + deflection checks tacked on, "148-138-133" & "53-48-46" mnemonics
β’ β/β
common mistakes: D vs d, grade-blind coefficients, skipping xu/d
#ESEPrep #CivilEngineering #SyllabusCrusher #ESE2027 | 98 |
| 9 | Q3 [Water Resources]: Using the Rational Method, estimate the peak runoff from a catchment of 5 ha with runoff coefficient C = 0.60 and design rainfall intensity i = 40 mm/hr. Peak discharge Q is: | 113 |
| 10 | Q2 [Geotechnical]: In an oedometer test, a 20 mm thick clay sample (double drainage) reached 50% consolidation in 20 min. A field clay layer 4 m thick with single drainage is loaded to the same stress increment. Time for 50% consolidation in the field: | 114 |
| 11 | Q1 [Structural/Steel]: A 16 mm thick gusset plate of Fe 410 (fu = 410 N/mm2) fails in block shear. Net shear area Anv = 2000 mm2, net tension area Ant = 600 mm2. As per IS 800:2007 Cl 6.4, the block shear design strength Vdb is: | 101 |
| 12 | Q3: Water flows at 2 m/s in a 500 m long rigid pipe (K = 2.1 GPa). The valve is closed in 0.4 s. The Joukowsky pressure rise is (rho = 1000 kg/mΒ³): | 129 |
| 13 | Q2: A normally consolidated clay (c' = 0) is tested in CU triaxial: cell pressure 200 kPa, deviator stress 300 kPa, pore pressure at failure 100 kPa. The effective friction angle phi' is: | 116 |
| 14 | Q1: A steel rod (E = 200 GPa, A = 500 mmΒ², L = 2 m) carries a 10 kN collar dropped from h = 25 mm. The maximum impact stress in the rod is: | 97 |
| 15 | π ESE Cracker β Day 74/174
π Mixed Revision: 5 Quick-Fire Concepts (Week 15)
Days 64β73 recap β 5 cards that carry the highest exam weight:
πΉ Column Buckling β Euler Pcr = ΟΒ²EI/(KL)Β², K factors, Ξ»c ladder, Rankine for Ξ» < Ξ»c
πΉ BOD Kinetics β y_t = L(1β10^βkt), the 68% rule at k=0.1, ThOD β₯ COD β₯ BOD
πΉ Concrete Mix Design β fck+1.65Ο, Abrams law, durability w/c caps (M20 0.55 / M25 0.50 / M30 0.45)
πΉ Activated Sludge β F/M, sludge age ΞΈc, SVI, recirculation R
πΉ Hill Roads β gradient compensation C = 30/(R+15)%, extra widening
β
Quick recap: Rankine when Ξ» < Ξ»c β’ BOD5 β 0.684L β’ F/M uses influent only β’ compensate on sharp curves
π‘ Revisions pe focus β yehi 5 cards har hafte ek baar dohrana.
#ESEPrep #CivilEngineering #SyllabusCrusher #ESE2027 | 133 |
| 16 | A spherical soap bubble of radius 2.5 mm is formed in air with surface tension 0.03 N/m. The excess pressure inside the bubble is: #ESEPrep #CivilEngineering #TargetPractice #ESE2027 | 149 |
| 17 | A retaining wall 5 m high retains cohesionless backfill (phi = 30 deg, gamma = 18 kN/m3). A surcharge of 10 kN/m2 acts on the backfill surface. The additional active thrust per metre run due to surcharge is: #ESEPrep #CivilEngineering #TargetPractice #ESE2027 | 137 |
| 18 | A fixed beam AB of span 6 m carries a point load of 90 kN at 2 m from support A. The fixed-end moment at A is: #ESEPrep #CivilEngineering #TargetPractice #ESE2027 | 121 |
| 19 | Day 73/174 β Timber: Properties, Seasoning & Defects
Friday = Engineering Materials. Day 72 covered Hill Roads; today it's timber β the OG construction material. Key highlights:
β’ Fiber Saturation Point (FSP) β 25β30% MC β shrinkage & strength gain start ONLY below this
β’ MC = (Ww β Wd)/Wd Γ 100% β denominator is always OVEN-DRY weight
β’ Shrinkage: Tangential > Radial β 2:1, Longitudinal β 0
β’ Worked example: 100 kg wet / 60 kg dry β MC = 66.7%; season to 15% β remove 31 kg water
β’ Seasoning: Air (cheapest, 15β20% MC) | Kiln (fast, 10β15%) | Water (decay-proof but weakens)
β’ Defects: Knots, Bow/Cup/Twist, Checks & Shakes, Termites, Dry rot
#ESEPrep #CivilEngineering #SyllabusCrusher #ESE2027 | 150 |
| 20 | Q3 (Transportation Engineering): Stopping sight distance on a level road at 80 km/h, reaction time 2.5 s and f = 0.35 (n = 0) is: | 150 |
