Consider the following two statements related to structural steel design, and identify whether they are true or false.
(1)The enter buckling load of a slender steel column de-pends on the yield strength of steel.
(2)In the design of laced column, the minimum spaing of the lacing does not depend on the slenderness of col-umn as a whole.
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The mean outdoor air chloroform (CH +Cl3) conc. in a room was determind to be 0.4 µq/m3. Use the following data : T =293k,
P = 1 atm, R = 82.05× 10–6 atm. m3/mol.k Atomic weights: C–12, H –1, Cl–35.5.
This conc. expressed in parts per billion is
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Solution
A circular primary clarifier processes an average flow 5005 m3/d of municipal waste water. The overflow rate is 35 m3/d. The diameter of clarifies shall be.
The DO in the unseeded sample of diluted waste having an initial DO of 9.5 mg/l is measured to be 3.5 mg/l after 5 days.The dilution factor is 0.03 ad the reaction rate constant, K =0.22/day. Find the ultimate carlonaceous BOD.
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Solution
A launching apron is to be designed at downstream of a weir for discharge intensity of 6.5 m3/sm. For the design of launching apron’s the scour depth is taken two times the Lacey’s scour depth. The silt factor of bed material is unity.If the tail water depth is 4.4m, the length of launching apron in the launching position is
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A volume of 3 × 106 m3 of around water was pumped out from an unconfnied acquafer, uniformly from an area of 5km2. The pumping covered the water table from initial level of 102 m to 99 m. The specific yield of aquifer is
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Water is lifted by a net head of 180 m. Indicated pumps each with specific speed of 30 m and rotational speed of 1450 rpm with design discharge of 0.2 m3/s are available. The minimum numbers of pumps required is________________ .
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A test plate 30 cm× 30 cm resting on a sand deposit settles by 10 mm under a certain loading intensity. A footing 150 cm × 200 cm resting on the same sand deposit and loading to the same loading intensity settles by
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A building is constructed on the ground surface beneath which, there is 2 m thick saturated clay layer sand witched between two highly previous layers. The building starts settling with time. If the average coefficient of consolidation of clay is 2.5 × 10–4cm2/s in how many days will the building reach half the final settlement.T50= 0.197
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A settlement analysis carried out for a proposed structure indicates that 9 cm of settlement will occur in 5 years and the final settlement will be 45 cm based on the doubled drainage conditions. A detailed site investigation indicates that only single drainage exists. Estimate the settlement at the end of 5 years for the changed condition.
Use Tv = \(\left ( \frac{\pi }{4} \right )U^{2}\)
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