41651. The time for a clay layer to achieve 90% consolidation is 15 years. The time required to achieve 90% consolidation; if the layer were twice as thick, 3 times forr permeable and 4 times more compressible would be :
41652. If soil is dried beyond its shrinkage limit, it will show :
41653. If YY is the centroidal axis of a T beam-section subjected to plastic moment, Mp, the neutral axis lies,
41654. The expression for the specific speed of a pump :
41655. A parabolic curve is used to connect a 4% upgrade with a 2% downgrade as shown in the below figure. The highest point on the summit is at a distance of (measured horizontally from the first tangent point - (FTP)
41656. A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m3 and a cohesion of 25 kN/m2. What will be the factor of safety if one has to have a slope angle of 30° ? Stability number is given to be 0.178 (from Taylor's chart) for a depth factor of 3.
41657. An inverted siphon is a
41658. The main constituents of gas generated during the anaerobic digestion of sewage sludge are :
41659. Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B ?
41660. A weir on a permeable foundation with downstream sheet pile is shown in the figure below. The exit gradient as per Khosla's method is
41661. Which one of the following set of values give the minimum clear cover (in mm) for the main reinforcements in the slab, beam, column and footing, respectively, according to IS : 456-1978 ?
41662. Two flow patterns are represented by their stream functions ψ1 and ψ2 as given below:ψ1 = x2 + y2, ψ2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :
41663. The forces in members 'a, b, c' in the truss shown are, respectively
41664. The plan of stairs supported at each end by landings spanning parallel with risers is shown in the below figure. The effective span of staircase slab is
41665. The value of bearing capacity factor for cohesion, Nc, for piles as per Meyerhof, is taken as :
41666. Permissible bending tensile stress in high yield strength deformed bars of grade 415 N/mm2 in a beam is :
41667. The equation along a stream line holds true for :
41668. An outlet irrigates an area of 20 ha. The discharge (l/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting other field losses is
41669. A stable channel is to be designed for a discharge of Q m3 /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by
41670. The problem of lateral buckling can arise only in those steel beams which have
41671. Mud pumping is commonly associated with
41672. The most important water quality parameter for domestic use of water is
41673. Rapid curing cut back bitumen is produced by blending bitumen with
41674. A pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm2 at centre of gravity of the section. The prestress in the tendons is 1000 N/mm2. Assuming modular ratio as 10, the stress (N/mm2) in concrete is
41675. A river 5 m deep consists of a sand bed with saturated unit weight of 20 kN/m3 . vw = 9.81 kN/m3. The effective vertical stress at 5 m from the top of sand bed is
41676. Biochemical oxygen demand (BOD) of waste water is a measure of
41677. The effective width of a reinforced concrete T beam flange under compression, according to IS : 456-1978, given I0 is the distance between the adjacent zero moment points, b is the breadth of the rib and D is the thickness of the flange, is
41678. In using the data from a plate bearing test for determining the modulus of subgrade reaction, the value of settlement to be used is :
41679. The net effective cross sectional area calculated in the steel angle tension member design, accounts for:
41680. A light house of 120 m height is just visible above the horizon from a ship. The correct distance (m) between the ship and the light house considering combined correction for curvature and refraction, is
41681. Water distribution systems are sized to meet the
41682. Determine the correctness of otherwise of the following Assertion [A] and the Reason [R]. Assertion [A] : The crown of the outgoing larger diameter sewer is always matched with the crown of incoming smaller diameter sewer. Reason [R] : It eliminates backing up of sewage in the incoming smaller diameter sewer.
41683. For the structure shown below, the vertical deflection at point A is given by
41684. In highway pavements emulsions are mainly used in :
41685. While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :
41686. A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of θ is
41687. The appropriate field test to determine the insitu undrained shear strength of soft clay is :
41688. Delta (Δ) in cm. Duty (D) in hectare Cumec and Base period (B) in days are related as
41689. The penetration test for bitumen is conduced at a temperature of
41690. According to Darcy's law for flow through porous media, the velocity is proportional to
41691. Storage coefficient of a compressible confined aquifer is a function of
41692. Factor of safety adopted by IS : 800 - 1984 while arriving at the permissible stress in axial compression, is :
41693. Well foundations are commonly used as foundations for the following structures :
41694. The consistency of a saturated cohesive soil is affected by
41695. The following two statements are made with reference to the planar truss shown below The truss is statically determinateThe truss is kinematically determinate With refernece to the above statements, which of the following applies ?
41696. The total thickness of pavement by CBR method depends on the CBR value of
41697. The standard plate size in a plate bearing test for finding modulus of subgrade reaction (k) value is
41698. The strain energy stored in member AB of the pin-jointed truss shown in the below figure, when E and A are same for all members, is
41699. In a river, discharge is 173 m3/s; water surface slope is 1 in 6000; and stage at the gauge station is 10.0 m. If during a flood, the stage at the gauge station is same and the water surface slope is 1 in 2000, the flood discharge in m3/s, is approximately
41700. In an area of 200 hectare, water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is
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