MPPSC SES Civil flashcards
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32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Divisibility by 11
- A number is divisible by 11 if the difference between the sum of digits in odd positions and the sum of digits in even positions is 0 or a multiple of 11.
- Compound interest two years
- For two years, compound interest minus simple interest equals P times (R/100) squared, where P is principal and R is annual rate percent.
- Euler buckling load
- Critical buckling load of a column is pi squared times EI divided by the square of effective length KL, where K depends on end conditions.
- Section modulus rectangular
- For a rectangular beam section of width b and overall depth d, the section modulus Z equals b times d squared divided by six.
- Limiting neutral axis depth
- In limit state design of reinforced concrete, the limiting ratio of neutral axis depth to effective depth is 0.53 for Fe415 steel and 0.48 for Fe500 steel.
- Total float
- Total float of an activity equals latest start minus earliest start, or latest finish minus earliest finish. Critical activities have zero total float.
- Void ratio and porosity
- Void ratio e is volume of voids divided by volume of solids; porosity n is volume of voids divided by total volume. They relate as n = e/(1+e).
- Terzaghi strip footing
- Ultimate bearing capacity of a strip footing is c Nc plus gamma Df Nq plus 0.5 gamma B N-gamma, with N factors depending on friction angle.
- Manning equation
- Average velocity in open channel flow equals one over Manning roughness n, times hydraulic radius to the two-thirds power, times bed slope to the one-half power.
- Rational method runoff
- Peak discharge in cubic metres per second equals runoff coefficient C times rainfall intensity i in mm per hour times catchment area A in square kilometres, divided by 3.6.
- BOD five day
- Five-day biochemical oxygen demand equals initial dissolved oxygen minus final dissolved oxygen, multiplied by the dilution factor of the sample.
- Superelevation formula
- Superelevation e equals V squared divided by 127 times radius R, minus lateral friction f, with V in km per hour and R in metres.
- Stopping sight distance
- Stopping sight distance equals 0.278 times design speed times reaction time, plus design speed squared divided by 254 times the sum of friction and grade.
- Height of instrument
- Height of instrument in levelling equals reduced level of benchmark plus backsight reading on that benchmark. Reduced level of a point equals height of instrument minus foresight.
- Relief displacement
- In a vertical photograph, relief displacement d equals radial distance r from principal point times object height h divided by flying height H above ground.
- PERT expected time
- Expected activity time equals optimistic plus four times most likely plus pessimistic time, all divided by six. Variance equals pessimistic minus optimistic divided by six, squared.
- Prismoidal formula
- Volume by prismoidal formula equals length divided by six, multiplied by the sum of the two end areas plus four times the mid-section area.
- Narmada origin
- The Narmada river originates at Amarkantak in Madhya Pradesh and flows west through a rift valley before draining into the Arabian Sea.
- Khajuraho temples
- Khajuraho temple complex in Chhatarpur district, Madhya Pradesh, is a UNESCO World Heritage Site known for Nagara-style architecture and intricate stone carvings.
- Effective stress
- Effective stress equals total stress minus pore water pressure. It controls soil shear strength and consolidation, and is used in bearing capacity calculations.
- Plasticity index
- Plasticity index equals liquid limit minus plastic limit. It indicates the range of water content over which soil remains plastic; higher values mean more clay content.
- Ogee spillway discharge
- Discharge over an ogee spillway equals coefficient C times effective length L times head H to the three-halves power, with C about 2.2 in SI units.
- Duty and delta relation
- Delta in metres equals 8.64 times base period B in days divided by duty D in hectares per cumec. Delta is depth of irrigation water applied.
- Breakpoint chlorination
- Breakpoint chlorination is the dose of chlorine at which free residual chlorine appears after satisfying all reducing substances and ammonia in water.
- Sound pressure level
- Sound pressure level in decibels equals 20 times logarithm base ten of the ratio of sound pressure to reference pressure of 20 micropascals.
- Degree of curve
- Degree of curve D for a circular highway curve equals 1719 divided by radius R in metres, based on a 30-metre chord definition.
- Tacheometric distance
- Horizontal distance by stadia tacheometry equals multiplying constant k times staff intercept s plus additive constant C, with k usually 100.
- GIS overlay union
- Union overlay combines two polygon layers and retains all areas from both layers, creating new polygons where boundaries intersect, with attributes from both inputs.
- GPS trilateration
- GPS receivers determine position by measuring distances to at least four satellites and solving for three coordinates plus receiver clock bias.
- Earned value cost variance
- Cost variance equals earned value minus actual cost. A negative value indicates cost overrun; positive indicates underrun relative to budget.
- Dry volume concrete
- Dry volume of concrete ingredients equals wet volume multiplied by about 1.52 to account for voids in sand and aggregate before mixing with water.
- Bandhavgarh National Park
- Bandhavgarh National Park in Umaria district, Madhya Pradesh, is known for a high density of Bengal tigers and ancient fort ruins within its boundaries.