29. is used in

A. Chezy's formula (c) Kutter's

B. Bazin's formula

C. Manning's formula.

D.

30. 9.32. The value of Chezy's constant is used in

A. Chezy's formula

B. Bazin's formula

C. Kutter's formula

D. Manning's formula.

31. The formula V = -n r32/,47--S used for determining flow velocities in sewers, is known as

A. Chezy's formula

B. Bazin's formula

C. Kutter's formula

D. Manning's formula.

32. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by

A. Bazin

B. Crimp and Bruge

C. William-Hazen

D. Kutter.

33. If ??, is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is

A. yw. r.S

B. y,, 7'112. S

C.( c) y?, r g

D. y?, r2/3 Arg.

34. The porosity of sediments in sewer pipes, is usually taken as

A.0.01

B.0.011

C.0.012

D.0.013

35. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

A. 0.30 m/sec

B. 0.35 m/sec

C. 0.40 m/sec

D. 0.45 m/sec

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