Engineering Questions with Answers - Multiple Choice Questions

Home » MCQs » Chemical Engineering » Environmental Engineering MCQ’s – Hydraulic Formulae

# Environmental Engineering MCQ’s – Hydraulic Formulae

The flow of sewage in the sewers is independent of its slope and geometry.

a) True

b) False

**
View Answer**

Answer: b

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.

The expression of the Chezy’s formula is given by ____________

a) V = C/RS

b) V = CRS^{2}

c) V = C (RS)^{1/2}

d) V = C/ (RS)^{1/2}

**
View Answer**

Answer: c

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.

The value of Kutter’s coefficient for cast iron is ____________

a) 0.02

b) 0.012

c) 0.12

d) 0.13Answer: b

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

**
View Answer**

Answer: b

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

The value of manning’s coefficient for cement concrete is ____________

a) 0.017

b) 0.13

c) 0.013

d) 0.17

**
View Answer**

Answer: c

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

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

**
View Answer**

Answer: a

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

The value of Bazen’s constant for good earthen channels is ____________

a) 0.12

b) 1.54

c) 0.50

d) 3.17

**
View Answer**

Answer: c

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

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

**
View Answer**

Answer: a

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

Which of the following is the expression of the Manning’s formula?

a) V = R^{1/3} S^{1/2}/ N

b) V = R^{2/3} S^{2}/ N

c) V = R^{2/3} S^{1/2}/ N

d) V = R^{2/3} S^{1/2}

**
View Answer**

Answer: c

Explanation: The Manning’s formula is given by V = R^{2/3} S^{1/2}/ 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.

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

**
View Answer**

Answer: d

Explanation: The Hazen and William’s coefficient for Asbestos cement pipe is 140 while of Steel pipe, Cement lined pipe and Wood stave pipe are 95, 110 and 120 respectively.