Bangladesh water development board job civil engineering question model test. civil engineering job circular
2016
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Transport 1. A sign is to be given in a turnoff. The value of 85th percentile speed is 50 km/h. The turnoff is to be approached at 25 km/h. The perception reaction time is 1.25 sec and deceleration rate is 0.3g. The minimum distance of the sign to be placed before the turnoff to have safe turning. 2. An engineer is willing to identify the speed characterisitics of an expressway. The confidence level is 95 percent and allowable speed is 0.1 km/h. He collected 230 spot speed data and the average speed of the vehicles are given. Did the personnel collected sufficient data? 3. Short note on: (i) Racked in surface dracing (ii) Sandwich surface dressing 4. Multiple choice: (i) The way to reduce pavement layer thickness by improving grade quality, (ii) The reinrforcement in an r.c.c slab is given in hor/ver/both/or wired mesh (iii) The value of car crash is found 40 in a 15.5 mile highway segment in one year. The ADT is 5000 vehicle. Find the rate of car crash in per 100 million vehicle mile. Structure 1. True/false (i) BNBC published first in 1994 (ii) The reduction factor of column for accidental eccentricity is 0.85 2. The SFD, BMD of the following post, neglecting self waight: 2 k/ft 6 ft 6 ft 5 ft 3. The width, effective depth and reinforcement of a beam section is given. fc= 3000 psi and fy= 60000 psi. Find if the tension control section is provided and the design strength. (formula given) Geotech 1. Multiple choice: (i) The time factor for 50% consolidation,
(ii) The value of porosoty is given, void ratio is (iii) The angle of internal friction is 30 degree, find active and passive earth pressure coeff. (iv) The bearing capacity factor of a long pile with (L/D)>50 (v) Find the depth of tension crack where c, unit weight are given. 2. Describe the factors affecting the bearing capacity of a shallow foundation resting in clay soil 3. The volume of a borrow pit is 1.1 ft3. The soil of this pit has wet wt of 130 lb and dry wt of 119 lb. The specific gravity is 2.7. Find the degree of saturation. 4. The dia is 24 in and depth is 100 ft of a friction pile. Coeff of adhesion is 0.5. the unconfined compressive strength is 2000 psf. Find the ultimate bearing capacity of the pile. Environment 1. True/false: (i) The BOD value found from the 1st order reaction is approximately the value of NBOD. (ii) In a gravity wastewater pipeline system, the self cleansing velocity should be attained at least twice a day (iii) The only disinfactant chemicals that can be used for waste water treatment are chlorine and ozon. (iv) Trickling filter system needs more skilled operation and maintenance than activated sludge system. 2. Show the diagram of different phases of the life cycle of bacteria. 3. The definition of (i) sewer, (ii) sewage, (iii) sullage WRE 1. The area for irrigation is 400 ha. The duty is 200 ha/cumec. Find the design discharge at the canal take off. 2. The field capacity and moisture depth are 27cm and 19 cm. The root zone depth and apparent specific gravity are given. The time required to irrigate 2 ha area in 60l/s rate. 3. The river Ganga flows (bankfull) in a rate of 25000 m3/sec. Find the (i) hydraulic geometry, (ii) the scoure depth, with bed material size of 0.15mm. 4. The value of dimensionless effective stress is 0.045. find the (i) effective velocity, (ii) the value of incipient depth of a wide river channel with the bed sediment size of 0.2 mm with longitudinal river bed slope of 0.0001. Assume any value. 5. The value of pressure, elevation and dia of a point P in a pipe section are given. Another point is Q whose elevation and dia are given, pressure has to be messured. Given discharge from P to Q is 2 m3/sec and hL = 1 m. 6. The value of peak of a 6h flood hydrograph is 35 m3/sec. The base flow is 10m3/sec. The value of rainfall depth is 3.25 cm and infiltration rate is 0.125cm/day (forgot unit). Find (i) the peak of 6h unit hydrograph, (ii) runoff coefficient. 7. The value of total direct runoff is given in m3. The value of depth of rainfall is 4 cm and runoff coefficient is 0.5. find the area of the catchment.
8. What is a best hydraulic section? Show the best triangular hydraulic section is one half of a square.