The following data are given for a channel-type grit chamber of length 7.5m. 1.flow-through velocity=0.3m/s 2) the depth of wastewater at peak flow in the channel=0.9m 3).specific gravity of inorganic particles=2.5 4).g=9.80m/s2 ,m=1.002x10-3 N-s/m2 at 200C ,ρw1000kg/m3 Assuming that the stokes law is valid,the largest diameter particle that would be removed with 100 percent  efficiency is:

1.  0.04mm

2.  0.21mm

3.  1.92mm

4.  6.64mm

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4
Correct Answer :

0.21mm


Explanation :
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The shape of clay particle is usually

1.  angular

2.  flaky

3.  tubular

4.  rounded

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4
Correct Answer :

flaky


Explanation :
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Inverse of the matrix  is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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Consistency Index for a clayer soil is [LL = Liquid Limit, PL = Plastic Limit, PI = Plasticity Index, W = natural moisture content]

1.  (LL-w)/PI

2.  w-PL/PI

3.  LL-PL

4.  0.5w

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4
Correct Answer :

(LL-w)/PI


Explanation :
No Explanation available for this question

Chlorine gas is used for disinfection combines with water to form hypochlorus acid(HOCl).The HOCl ionizes to form hypochlorite (OCl-) in a reversible reaction:    HOCl⇔H+ OCl-(k=2.7x10-8  at 200 C) ,the equilibrium of which is governed by pH.The sum of HOCL and OCL- is known as free chlorine esidual and HOCl is the more effective disinfectant. The 90% fraction of HOCl in the free chlorine residual is available at a pH value

1.  4.8

2.  6.6

3.  7.5

4.  9.4

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4
Correct Answer :

6.6


Explanation :
No Explanation available for this question

For a road with camber of 3% and the design speed of 80km/hr,the minimum radius of the curve,beyond which NO superelevation is needed,is:

1.  1680m

2.  948m

3.  406m

4.  208m

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4
Correct Answer :

208m


Explanation :
No Explanation available for this question

According to Darcy's law for flow through porous media, the velocity is proportional to

1.  effective stress

2.  hydraulic gradient

3.  cohesion

4.  stability number

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4
Correct Answer :

hydraulic gradient


Explanation :
No Explanation available for this question

A marshall specimen is prepared for bituminous concrete with a bitumen content of 5 percent by weigh of total mix. The theoretical and the measured unit weights of the mix are 2.442g/cm3 and 2.345g/cm3,respectively.The bitumen has a specific gravity of 1.02.The percent voids in mineral aggregate filled bitumen(VFB) are:

1.  34.55

2.  35.9

3.  73.55

4.  74.3

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4
Correct Answer :

73.55


Explanation :
No Explanation available for this question

The data given below pertain to the design of a flexible pavement Initial traffic=1213 cvpd Traffic growth rate=8% per annum Design life=12 years Vehicle damage factor=2.5 Distribution factor=1.0 The design traffic in terms of million standard axles (msa) to be catered would be

1.  0.06 msa

2.  8.40msa

3.  21.00msa

4.  32.26msa

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4
Correct Answer :

21.00msa


Explanation :
No Explanation available for this question

The The coefficient of friction in the longitudinal direction of a highway is estimated as 0.396.The braking distance for a car moving at a speed of 65km/hr is:

1.  87m

2.  45m

3.  42m

4.  40m

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4
Correct Answer :

42m


Explanation :
No Explanation available for this question
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