Engineering Questions with Answers - Multiple Choice Questions

# Environmental Engineering MCQ – Hydraulic Formulae

1 - Question

The flow of sewage in the sewers is independent of its slope and geometry.
a) True
b) False

Explanation: The flow of sewage in the sewers depends on flow condition, characteristic of sewage, slope and geometry of sewer, bends, transitions and roughness of the interior surface of sewer.

2 - Question

The expression of the Chezy’s formula is given by ____________
a) V = C/RS
b) V = CRS2
c) V = C (RS)1/2
d) V = C/ (RS)1/2

Explanation: Chezy’s formula is given by V = C (RS)1/2 where C is the Chezy’s constant, R is the hydraulic mean radius and S is the hydraulic gradient.

3 - Question

The value of Kutter’s coefficient for cast iron is ____________
a) 0.02
b) 0.012
c) 0.12
d) 0.13

Explanation: When the condition of interior surface is good, the value of Kutter’s coefficient for cast iron is 0.012.

4 - Question

The value of manning’s coefficient for cement concrete is ____________
a) 0.017
b) 0.13
c) 0.013
d) 0.17

Explanation: When the condition of interior surface is good, the value of Manning’s coefficient for cement concrete is 0.013.

5 - Question

Which of the following conduit material has the maximum Kutter’s coefficient in terms of good surface?
a) Brick
b) Salt glazed stoneware
c) Cast iron
d) Galvanized iron

Explanation: The unglazed brick has the maximum Kutter’s coefficient in terms of good surface with the value of 0.013.

6 - Question

The value of Bazen’s constant for good earthen channels is ____________
a) 0.12
b) 1.54
c) 0.50
d) 3.17

Explanation: When the type of inside surface of sewer is a good earthen channel, the value of Bazen’s constant is 0.50.

7 - Question

Which of the following has a minimum manning’s coefficient in terms of fair interior surface?
a) Plastic smooths
b) Asbestos cement
c) Brick
d) Cement concrete

Explanation: Plastic smooth has the minimum Manning’s coefficient in terms of the fair interior surface with a value of 0.011.

8 - Question

Which of the following is the expression of the Manning’s formula?
a) V = R1/3 S1/2/ N
b) V = R2/3 S2/ N
c) V = R2/3 S1/2/ N
d) V = R2/3 S1/2

Explanation: The Manning’s formula is given by V = R2/3 S1/2/ N where V is the velocity of flow, ‘R’ is the mean hydraulic radius, ‘S’ is the slope of the sewer and ‘N’ is the rugosity coefficient.

9 - Question

Which of the following order is correct regarding Hazen and William’s coefficient?
i. Steel pipe
ii. Cement lined pipe
iii. Wood stave pipe
iv. Asbestos cement pipe
a) i > ii > iii > iv
b) i > iii > ii > iv
c) iv > ii > iii > i
d) iv > iii > ii > i