Engineering Questions with Answers - Multiple Choice Questions
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Environmental Engineering MCQ – Chemical Clarification
_________ is the average of velocities at a point over a definite period of time.
Figure: Flash mixer
a) Mean velocity
b) Relative velocity
c) Velocity gradient
d) Temporal mean velocity
View Answer
Answer: d
Explanation: Temporal mean velocity is the average of velocities at a point over a definite period of time. It is represented by G.
Which of the following is the correct expression regarding temporal mean velocity in the following figure?
Figure: Flash mixer
a) G = (P/μV)1/2
b) G = (P/μV)
c) G = (P/μV)2
d) G = (Pμ/V)1/2
View Answer
Answer: a
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.
Which of the following represents the impeller shaft in the following figure?
Figure: Flash mixer
a) F
b) E
c) C
d) B
View Answer
Answer: a
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.