Related Questions

If average particle size of the silt in millimeters is m, the Lacey's silt factor f is proportional to
A m3
B $${{\text{m}}^{\frac{1}{2}}}$$
C $${{\text{m}}^{\frac{1}{3}}}$$
D $${{\text{m}}^{\frac{2}{3}}}$$
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is
A $$\frac{{2{{\text{V}}^2}}}{{\sqrt 3 {\text{R}}}}$$
B $$\frac{{3{{\text{V}}^2}}}{{4{\text{R}}}}$$
C $$\frac{{5{{\text{V}}^2}}}{{2{\text{R}}}}$$
D $$\frac{{2{{\text{V}}^2}}}{{5{\text{R}}}}$$
According to Lacey, in regime conditions
A Silt is kept in suspension by vertical components of eddies
B Entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
C Both (A) and (B)
D Neither (A) nor (B)
The scour depth D of a river during flood, may be calculated from the Lacey's equation
A D = 0.47 $$\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)$$
B D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{1}{2}}}$$
C D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{1}{3}}}$$
D D = 0.47 $${\left( {\frac{{\text{Q}}}{{\text{f}}}} \right)^{\frac{2}{3}}}$$
According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
A 1.25 D
B 1.50 D
C 1.75 D
D 2.00 D
Lacey's equation for calculating flood discharge in rivers, is
A $${\text{V}} = 10.8\,{{\text{R}}^{\frac{1}{2}}}{{\text{S}}^{\frac{1}{2}}}$$
B $${\text{V}} = 10.8\,{{\text{R}}^{\frac{2}{3}}}{{\text{S}}^{\frac{1}{2}}}$$
C $${\text{V}} = 10.8\,{{\text{R}}^{\frac{2}{3}}}{{\text{S}}^{\frac{1}{3}}}$$
D $${\text{V}} = 10.8\,{{\text{R}}^{\frac{1}{3}}}{{\text{S}}^{\frac{2}{3}}}$$
The Lacey's regime velocity is proportional to
A $${{\text{R}}^{\frac{1}{2}}}{{\text{S}}^{\frac{3}{4}}}$$
B $${{\text{Q}}^{\frac{3}{4}}}{{\text{S}}^{\frac{1}{3}}}$$
C $${{\text{R}}^{\frac{3}{4}}}{{\text{S}}^{\frac{1}{3}}}$$
D $${{\text{R}}^{\frac{2}{3}}}{{\text{S}}^{\frac{1}{2}}}$$
The material carried by the glacier such as rocks big and small, sand and silt gets deposited, which are called glacial ________.
A moraines
B deltas
C plateaus
D grooves
Clay and silt content in a good brick earth must be at least
A 50%
B 40%
C 30%
D 25%
According to IS classification, the range of silt size particles is
A 4.75 mm to 2.00 mm
B 2.00 mm to 0.425 mm
C 0.425 mm to 0.075 mm
D 0.075 mm to 0.002 mm

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