# Test: Chemical Clarification

## 10 Questions MCQ Test Environmental Engineering | Test: Chemical Clarification

Description
Attempt Test: Chemical Clarification | 10 questions in 25 minutes | Mock test for Chemical Engineering preparation | Free important questions MCQ to study Environmental Engineering for Chemical Engineering Exam | Download free PDF with solutions
QUESTION: 1

### Which of the following represents the coagulant pipe?

Solution:

Explanation: ‘A’ represents the coagulant pipe which is used for discharging the coagulant into the flash mixer.

QUESTION: 2

### Which of the following represents the device which is used for sludge removal?

Solution:

Explanation: ‘D’ represents the drain valve which is used for the removal of sludge from the mixer.

QUESTION: 3

### _________ is the average of velocities at a point over a definite period of time.

Solution:

Explanation: Temporal mean velocity is the average of velocities at a point over a definite period of time. It is represented by G.

QUESTION: 4

Which of the following goes to the flocculation tank?

Solution:

Explanation: ‘B’ represents the outlet of the mixer which goes to the flocculation tank.

QUESTION: 5

Which of the following is the correct expression regarding temporal mean velocity?

Solution:

Explanation: Temporal mean velocity G = (P/μV) 1/2, where P is the power, μ is the dynamic viscosity and V is the volume of the tank. It is measured in per second.

QUESTION: 6

Which of the following is correctly paired?

Solution:

Explanation: E represents the Impeller which is driven by the electric motor to revolve in the tank.

QUESTION: 7

The speed of impeller in a flash mixer is

Solution:

Explanation: The speed of impeller in a flash mixer is between 100 to 120 rpm and the propeller type impeller is used.

QUESTION: 8

‘C’ in the following figure represents the ________

Solution:

Explanation: ‘C’ represents the deflecting wall, whereas the boundary below the inlet and outlet of the tank is the flash mixer wall.

QUESTION: 9

The detention period of a flash mixer is

Solution:

Explanation: The detention period of flash mixer lies between 30 seconds to 2 minutes.

QUESTION: 10

Which of the following represents the impeller shaft?

Solution:

Explanation: Impeller is connected to impeller shaft which is further connected to electric motor so as to drive the impeller and mixing of coagulant in water takes place.

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