Description : Seepage through embankments in an earthen dam is controlled by (A) Drainage filters (B) Relief wells (C) Drain trenches (D) Provision of downstream berms
Last Answer : Answer: Option C
Description : Differentiate between earthen dam and gravity dam with respect to seepage , foundation , construction and maintenance
Last Answer : Differentiate between earthen dam and gravity dam with respect to seepage , foundation , construction and maintenance
Description : For the upstream face of an earthen dam, the most adverse condition for stability of slope is (A) Sudden drawdown (B) Steady seepage (C) During construction (D) Sloughing of slope
Last Answer : Answer: Option A
Description : The uplift pressure on a dam can be controlled by (i) Constructing cut-off under upstream face (ii) Constructing drainage channels between the dam and its foundation (iii) By pressure grouting in foundation The correct answer is ... ) and (ii) (C) Both (i) and (iii) (D) (i), (ii) and (iii)
Last Answer : Answer: Option D
Description : The most suitable material for the central impervious core of a zoned embankment type dam is (A) Clay (B) Coarse sand (C) Silty clay (D) Clay mixed with fine sand
Description : Which of the following spillways is least suitable for an earthen dam? (A) Ogee spillway (B) Chute spillway (C) Side channel spillway (D) Shaft spillway
Description : As compared to gravity dams, earthen dams (A) Are costlier (B) Are less susceptible to failure (C) Require sound rock foundations (D) Require less skilled labour
Description : Name the longest earthen dam of the World. a) Hirakud Dam b) Singur Dam c) Indravati Dam d) Mettur Dam
Last Answer : a) Hirakud Dam
Description : Explain with neat sketch Phreatic line in earthen dam with pressure head at different point and show construction points of this line.
Last Answer : Procedure for locating the Phreatic line i) Draw an earthen dam having upstream face AB with water surface. ii) On water surface measure distance BC = 0.3 L C is starting pt of base parabola. Let F' ... parabola i.e. Phreatic line. viii) Here G,Q1,Q2,Q3,Q4 and B represent Phreatic line
Description : Explain phreatic line in earthen dam with a sketch.
Last Answer : Phreatic line in earthen dam1.The line in earthen dam section below which there is positive hydrostatic pressure exists. Phreatic line separates the dry and wet part of earthen dam body as it acts as boundry ... toe material. Hence, a rock toe is necessary to avoid removal of toe portion of dam.
Description : Draw a labelled sketch of Earthen dam
Last Answer : Earthen dam
Description : The toe projection of foundation slabs is taken (A) As one third of the base (B) As one sixth of overall height of the wall (C) Equal to heel slab (D) Below ground surface
Description : When the reservoir is full, the maximum compressive force in a gravity dam is produced (A) At the toe (B) At the heel (C) Within the middle third of base (D) At centre of base
Description : The uplift pressure on the face of a drainage gallery in a dam is taken as (A) Hydrostatic pressure at toe (B) Average of hydrostatic pressure at toe and heel (C) Two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel (D) None of the above
Description : In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to (A) Increase the depth of foundation (B) Drain the soil (C) Compact the soil (D) Replace the poor soil
Description : Pick up the correct statement from the following: (A) D.P.C. should be continuous (B) D.P.C. should be of good impervious material (C) D.P.C. may be horizontal or vertical (D) All the above
Last Answer : Option D
Description : Before constructing a dam, the factor to be considered for controlling sedimentation, is (A) Selection of dam site (B) Construction of check dams (C) Providing vegetation screens (D) All the above
Last Answer : (D) All the above
Description : The loose pockets in soil mass can be bridged safely by providing a raft foundation provided the soft area is smaller than (A) The column spacing (B) One-third the column spacing (C) Half the column spacing (D) Three-fourth the column spacing
Last Answer : Answer: Option B
Description : Raft foundations are used for: (A) Providing increased area of foundation over poor bearing capacity of soil (B) Spanning over small soft or loose pockets (C) Counter acting the hydrostatic effect (D) All the above
Description : For providing a raft foundation, the following activities are involved 1. Ramming the foundation bed 2. Excavation of the soil upto required depth 3. Laying the reinforcement over the foundation bed 4. Curing the cement concrete placed over ... 2, 1 (C) 2, 1, 3, 5, 4 (D) 3, 2, 5, 1, 4
Description : Petroleum deposits are detected by the. (A) Oil seepage at the surface of the earth (B) Measurement of density, elasticity and magnetic & electric properties of the rock in the crust of the earth (C) Age & nature of rocks inside the crust of the earth (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Which one among the following is not a reason for practising tank irrigation in the Peninsular India? [NDA 2011] (a) The undulating relief and hard rocks (b) little percolation of rain ... of Peninsular India are perennial (d) There are many streams which become torrential during rainy season
Last Answer : Ans: (c)
Description : The quantity of seepage of water through soils is proportional to (A) Coefficient of permeability of soil (B) Total head loss through the soil (C) Neither (a) nor (b) (D) Both (a) and (b)
Description : During seepage through a soil, direction of seepage is always (A) Parallel to equipotential lines (B) Perpendicular to stream lines (C) Perpendicular to equipotential lines (D) None of these
Description : A strainer type well sunk through three previous layers intervened by three impervious aquicludes, draws water from (A) Top most pervious layer (B) Central pervious layer (C) Lowest pervious layer (D) All the pervious layer
Last Answer : (D) All the pervious layers
Description : The direct shear test suffers from the following disadvantage: (A) Drain condition cannot be controlled (B) Pore water pressure cannot be measured (C) Shear stress on the failure plane is not uniform (D) The area under the shear and vertical loads does not remain constant throughout the test
Description : State the necessity of providing catch water drain in Hill Roads.
Last Answer : 1) Catch water drains are provided to collect excessive rainwater in heavy rainfall regions i.e. in case of hill roads. 2) These drains are useful to avoid large water flow reaching to hill ... be excavated natural rock section on hill top side which avoids erosion of soil along hill road.
Description : I share people who you love. My fifth letter is in letter but not in mutt. if you cut off two heads I become what you do to hit some one with a weapon. I can have designes but I might be ... something that is really important not to do. I rhyme with two words in this riddle. What am I? -Riddles
Last Answer : Frame.
Description : Before providing super-elevation on roads, the portion of the carriageway between the crown and the outer edge is made (A) To have a reduced fall (B) Horizontal (C) To have slope of the camber on the other half of the carriageway (D) None of these
Description : Horizontal acceleration due to earthquake results in (A) Hydrodynamic pressure (B) Inertia force into the body of the dam (C) Both (A) and (B) (D) None of the above
Description : The range of spread from the wall base to outer edge of a brick work foundation does not exceed (A) 1/2 horizontal to 1 vertical (B) 2/3 horizontal to 1 vertical (C) 1 horizontal to 1 vertical (D) 2 horizontals to 1 vertical
Description : Darcy's law is applicable to seepage if a soil is (A) Homogeneous (B) Isotropic (C) Incompressible (D) All the above
Description : The critical exist gradient of seepage water in soils, is (A) Directly proportional to the voids ratio (B) Inversely proportional to the specific gravity (C) Directly proportional to the specific gravity (D) None of these
Last Answer : (D) None of these
Description : Flow net is used for the determination of (A) Quantity of seepage (B) Hydrostatic pressure (C) Seepage pressure (D) All the above
Description : A critical hydraulic gradient may occur when (A) Flow is in upward direction (B) Seepage pressure is in upward direction (C) Effective pressure is zero (D) All the above
Description : The seepage exit gradient in a soil is the ratio of A) Total head to the length of seepage (B) Flow line to slope (C) Head upstream to that at downstream (D) Head loss to the length of the seepage
Description : The critical exist gradient of seepage water in soils, increases with (A) An increase in specific gravity (B) A decrease in specific gravity (C) A decrease in void ratio (D) Both (a) and (c)
Description : When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction of flow. ... known (A) Quick condition (B) Boiling condition (C) Quick sand (D) All the above
Description : A flow net may be utilised for the determination of (A) Exit gradient (B) Seepage (C) Hydrostatic pressure (D) All the above
Description : The seepage force in a soil, is (A) Perpendicular to the equipotential lines (B) Proportional to the exit gradient (C) Proportional to the head loss (D) All the above
Description : An aquiclude is (A) A non artesian aquifer (B) An artesian aquifer (C) A confined bed of impervious material between aquifers (D) A large water body underground
Last Answer : (C) A confined bed of impervious material between aquifers
Description : If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow: (A) A straight line (B) A parabola (C) A semi-ellipse (D) A semi-circle
Last Answer : (C) A semi-ellipse
Description : A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm2 per minute. For attaining 50% consolidation with a ... 20, the number of days required (A) 3233 (B) 3123 (C) 33331 (D) 3313
Description : Pick up the correct statement from the following: (A) Perched aquifer is found in unconfined aquifer (B) The top surface of the water held in the perched aquifer, is known as perched water table (C) Perched aquifer is formed in unfined acquirer if an impervious layer exists (D) All the above
Description : Pick up the correct statement from the following: (A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude (B) The top most water bearing strata having no aquifer, is ... water from the top most water bearing strata, are called water table wells (D) All the above
Description : Glazing is used to make earthenware (A) Hard (B) Soft (C) Porous (D) Impervious
Description : The rate of payment is made for 100 cu m (per % cu m) in case of (A) Earth work in excavation (B) Rock cutting (C) Excavation in trenches for foundation (D) All the above
Description : Dams are designed to reduce flooding by ____________. a) Protecting river banks from erosion b) Providing storage for flood water c) Increasing the downstream velocity of flood water ‘ d) Trapping sediment behind the dam so it can't be deposited downstream
Last Answer : b) Providing storage for flood water
Description : Dams are designed to reduce flooding by _______________. a) Protecting river banks from erosion b) Providing storage for flood water c) Increasing the downstream velocity of flood water d) Trapping sediment behind the dam so it can't be deposited downstream
Description : State the necessity of providing (i) Combined column footing and (ii) Raft foundation
Last Answer : (i) Combined column footing:- A combined footing provided as a column for two or more columns in a row. Combine footing is also provided when the columns are very near to each other and ... total individual footing area of all columns exceeds 50% of built up area of building at ground floor.