The observed value of the standard penetration number(N) at 10m depth of a silty sand deposit is 13. The unit weight of the soil is 16 kN/m3. The N value after correcting for the presence of fines will be
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Solution
13
In a saturated soil deposit having a density of 22 kN/m3,the effective normal stress on a horizontal plane at 5 m depth will be ________ .
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Solution
αeff =γsat × 5 - γw= 110 – 50 = 60 kN/m2
Two specimens of clay A and B are tested on a consolidation operative. If (mv)A = 3.6 × 10–4 m2/kN and(mv)B = 1.8 × 10–4 m2/kN, If Cv(A) = 3.8 × 10–4cm2/sec,and CV(B)= 1.9 × 10–4cm2/sec, then ratio of k
A/kB is equal to ________ .
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Solution
A light house of height 135 m is just visible above the horizon of a ship. The correct distance between ship and light house considering combined correction for curvature and refraction is
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Solution
Distance to visible horizin, D
C = 6⁄7(0.0786)D2
135 = 6⁄7 × 0.0786 × D2
D = 44.76 km = 44760 m
A bench mark with reduced level 130.125 has been established at the floor of a room. It is required to find out the RC of outer side of the roof of the room using spirit levelling. The back sight to the bench mark has been observed as 1.5 m where as the foresight to roof has been observed as 0.425 (staff held vertical).
The reduced level (in m) of roof R will be
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Solution
R.L to roof = BM + BS + FS
= 130.125 + 1.5 + 0.425
= 132.05 m
A 2 lane single carriage-way is to be designed for a design life period of 15 years. Total 2-way traffic in the year completion of construction is expected to be 2000 commercial vehicles/day. Vehicle damage factor = 3.0, lane distribution factor = 0.75. Assuming an annual rate of traffic growth as 7.5%, the design traffic expressed as cumutative number of standard axles is
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Solution
Which of the following is a secondary air pollutants?
For a water treatment plant having a flow rate of 432 m3/hr, what is the required plan are of a type 1 settling tank to remove 90% of the particles having a settling velocity of 0.12 cm/s is
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Solution
The alkamty and hardness of water sample are 200 mg/Land 320 mg/L as CaCO3 respectively The water has:
A canal irrigates a portion of a culturable command area to grow sugar are and wheat. The average discharges required to grow sugar cane and wheat are 0.32 and 0.29 cumecs respectively the time factor is 0.8 the required design capacity of canal is:
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Solution