The bed slope in slow sand filters, is generally kept
(A) 1 in 50
(B) 1 in 75
(C) 1 in 100
(D) 1 : 200
Description : In slow sand filters, the turbidity of raw water can be removed only up to (A) 60 mg/litre (B) 75 mg/litre (C) 100 gm/litre (D) 150 mg/litre
Last Answer : (A) 60 mg/litre
Description : Pick up the incorrect statement from the following: (A) The water entering the slow sand filters should be treated by 9.386 coagulants (B) The depth of water on the filter should be twice the ... is 0.75 times the depth of filter sand, the water obtained is purest (D) All the above
Last Answer : (D) All the above
Description : Rapid gravity filters (A) Were developed by G.W. Fuller (B) Make use of coarser sand with effective size as 0.5 mm (C) Yield as high as 30 times the yield of slow sand filters (D) All the above
Description : Pick out the true statement pertaining to water treatment. (A) Slow sand filters can remove colour completely (B) Activated carbon can be used for taste & odour control without subsequent filtration ... of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Last Answer : (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Description : The horizontal deflection of a parabolic curved beam of span 10 m and rise 3 m when loaded with a uniformly distributed load l t per horizontal length is (where Ic is the M.I. at the crown, which varies as the slope ... arch). (A) 50/EIc (B) 100/EIc (C) 150/EIc (D) 200/E
Last Answer : (D) 200/E
Description : Water filtration rate in a slow sand filter ranges from __________ litres/m2 /hr. (A) 10 to 20 (B) 100 to 200 (C) 1500 to 2500 (D) 4000 to 5000
Last Answer : (B) 100 to 200
Description : A simply supported rolled steel joist 8 m long carries a uniformly distributed load over it span so that the maximum bending stress is 75 N/mm². If the slope at the ends is 0.005 radian and the value of E = 0.2 ... joist, is (A) 200 mm (B) 250 mm (C) 300 mm (D) 400 mm
Last Answer : (D) 400 mm
Description : The radius of curvature of the arc of the bubble tube is generally kept (A) 10 m (B) 25 m (C) 50 m (D) 100 m
Last Answer : (D) 100 m
Description : The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to (A) 25 cm (B) 50 cm (C) 75 cm (D) 100 cm
Last Answer : (D) 100 cm
Description : The prescribed hardness limit of potable water ranges between (A) 50 to 75 P.P.M. (B) 75 to 115 P.P.M. (C) 100 to 150 P.P.M. (D) 150 to 200 P.P.M.
Last Answer : (B) 75 to 115 P.P.M.
Description : Pick up the correct statement from the following: (A) The sand in the sand pile is well compacted (B) The sand is kept moist at the time of placing and tamping (C) Sand piles are generally used under column loads (D) All of the above
Last Answer : Answer: Option D
Description : Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre
Last Answer : (D) 50 gm/litre
Description : In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than (A) 10 (B) 15 (C) 20 (D) 25
Last Answer : (C) 20
Description : An ideal sand for filters should be (A) Free from dirt and other impurities (B) Uniform in nature and size (C) Hard and resistant (D) All the above
Description : A coarse-grained soil has a voids ratio 0.75, and specific gravity as 2.75. The critical gradient at which quick sand condition occurs, is (A) 0.25 (B) 0.50 (C) 0.75 (D) 1.00
Last Answer : (D) 1.00
Description : The ratio of the breadth to effective depth of a beam is kept (A) 0.25 (B) 0.50 (C) 0.70 (D) 0.75
Last Answer : Answer: Option B
Description : If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is (A) M 100 (B) M 150 (C) M 200 (D) M 250
Last Answer : Answer: Option A
Description : The total sulphur content of the body is (A) 25–50 gm (B) 50–75 gm (C) 100–125 gm (D) 150–200 gm
Last Answer : Answer : D
Description : Fee for availing business reply service a) Apr to Jun -100, Jul to Sep-75, Oct to Dec-50, Jan to Mar -25 b) Apr to Jun -200, Jul to Sep-150, Oct to Dec-100, Jan to Mar -50 c) Apr to Jun -250, Jul to Sep-150, Oct to Dec-75, Jan to Mar -50 d) Free of cost
Last Answer : b) Apr to Jun -200, Jul to Sep-150, Oct to Dec-100, Jan to Mar -50
Description : Width of the shoulders of carriage way is generally kept (A) 100 cm (B) 125 cm (C) 150 cm (D) 250 cm
Description : For wave action in dams, the maximum height of freeboard is generally taken to be equal to (A) 0.5 hw (B) 0.75 hw (C) 1.25 hw (D) 1.50 hw
Description : The coefficient of venturi-flume, generally, lies between (A) 0.3 to 0.45 (B) 0.50 to 0.75 (C) 0.75 to 0.95 (D) 0.95 to 1.0
Description : Select the correct statement. . A) Contour interval on any map is kept constant. (B) Direct method of contouring is cheaper than indirect method. (C) Intervisibility of points on a contour map cannot be ascertained. (D) Slope of a hill cannot be determined with the help of contours.
Last Answer : (A) Contour interval on any map is kept constant.
Description : Pick out the wrong statement pertaining to the turbine agitator. (A) Recommended peripheral speed for the turbine agitator is 200-250 metres/minute (B) Pitched blade turbine agitator gives only radial flow with ... l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)
Last Answer : (B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Description : Pick up the incorrect statement from the following. For performing compressive strength test of cement (A) Cement and standard sand mortar are used in the ratio of 1 : 3 (B) Water is added at the ... cm 10 cm is used (D) The prepared moulds are kept in a atmosphere of 50% relative humidity
Description : A high velocity of wash water is required for (A) Rapid gravity filter with strainers (B) Rapid gravity filter without strainers (C) Slow sand filter with strainers (D) Slow sand filter without strainers
Last Answer : (B) Rapid gravity filter without strainers
Description : Efficiency of removing bacterias from raw water by a slow sand filter, is (A) 80% to 81% (B) 85% to 86% (C) 90% to 97% (D) 98% to 99%
Last Answer : (D) 98% to 99%
Description : Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media (C) Is used after slow sand filtering has been done (D) Can combine disinfection also
Last Answer : (A) Should be preceded by coagulation and sedimentation
Description : The period of cleaning of a slow sand filter, is usually (A) 5 to 10 days (B) Two weeks to three weeks (C) One month to three months (D) Three months to six months
Last Answer : (C) One month to three months
Description : The yield of a rapid gravity filter as compared to that of slow sand filter, is (A) 10 times (B) 15 times (C) 20 times (D) 30 times
Last Answer : (D) 30 times
Description : Distribution of wash water is provided in (A) Sedimentation tank (B) Slow sand filter (C) Rapid gravity filter (D) All the above
Last Answer : (C) Rapid gravity filter
Description : A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm
Last Answer : (D) 70 cm to 120 cm
Description : After cleaning a slow sand filter, the filtered water is not used for (A) 6 hours to 12 hours (B) 12 hours to 18 hours (C) 18 hours to 24 hours (D) 24 hours to 36 hours
Last Answer : (D) 24 hours to 36 hours
Description : Littoral drift (A) Is the raised line of sand, parallel to the sea coast (B) Is the slow movement of surface water at sea caused by the wind (C) Is a current parallel to the shore, caused due to tangential component of the wind (D) Is a current perpendicular to the shore line caused due to wind
Last Answer : (C) Is a current parallel to the shore, caused due to tangential component of the wind
Description : Rapid gravity filters can remove bacterial impurities up to a maximum of (A) 50 % (B) 60 % (C) 70 % (D) 80 %
Last Answer : (D) 80 %
Description : The slope correction for a length of 30 m along a gradient of 1 in 20, is (A) 3.75 cm (B) 0.375 cm (C) 37.5 cm (D) 2.75 cm
Last Answer : (A) 3.75 cm
Description : P.V.C. pipes can withstand pressure bead of water upto (A) 25 m (B) 50 m (C) 75 m (D) 100 m
Description : The eccentricity (e) of a hollow circular column, external diameter 25 cm, internal diameter 15 cm for an eccentric load 100 t for non-development of tension, is (A) 2.75 cm (B) 3.00 cm (C) 3.50 cm (D) 4.25 cm
Last Answer : (D) 4.25 cm
Description : Diopter is the power of a lens having a focal length of (A) 25 cm (B) 50 cm (C) 75 cm (D) 100 cm
Description : DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within (A) 25 km (B) 50 km (C) 75 km (D) 100 km
Description : Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds (A) 50 cm (B) 75 cm (C) 100 cm (D) 120 cm
Description : While calculating the overtaking sight distance, the height of the object above road surface, is assumed (A) 50 cm (B) 75 cm (C) 100 cm (D) 120 cm
Description : To compensate the loss of tractive force of vehicles along curves of radius R, the percentage reduction of gradient, is (A) 50/R (B) 75/R (C) 100/R (D) 125/R
Description : The thickness of bituminous carpet varies from (A) 20 to 25 mm (B) 50 to 75 mm (C) 75 to 100 mm (D) 100 to 120 mm
Description : For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is (A) 50 mm (B) 75 mm (C) 100 mm (D) 120 mm
Last Answer : (B) 75 mm
Description : Based on its dry weight, a freshly felled tree may contain water (A) 25 % (B) 50 % (C) 75 % (D) 100 %
Description : The concrete slump recommended for beams and slabs; is (A) 25 to 50 mm (B) 25 to 75 mm (C) 30 to 125 mm (D) 50 to 100 mm
Last Answer : Answer: Option C
Description : The concrete slump recommended for columns, is (A) 25 to 50 mm (B) 25 to 75 mm (C) 75 to 125 mm (D) 50 to 100 mm
Description : The concrete slump recommended for foundations, is (A) 25 to 50 mm (B) 30 to 125 mm (C) 50 to 100 mm (D) 75 to 125 mm