Agitation And Aeration

Question: Froude number is avoided in calculation of power requirements for low viscosity liquid mixing systems when
[A].

baffled systems are used

[B].

Reynolds number is less than 300

[C].

both (a)and(b)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following number is calculated from the diameter and peripheral speed of the impeller?
[A].

Reynolds number

[B].

Froude number

[C].

Power number

[D].

None of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following impellers are used for wide range of viscosities?
[A].

paddles

[B].

turbines

[C].

propellers

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Swirling and vortex formation can be prevented by
[A].

using baffles

[B].

using diffusion ring with turbines

[C].

both (a) and (b)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following impellers will provide radial flow?
[A].

Paddles

[B].

Flat blade turbines

[C].

Disk flat blade turbines

[D].

All of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Which of the following impeller is used in situation where strong vertical currents are desirable for suspending heavily particles?
[A].

Propeller

[B].

Paddle

[C].

Turbine

[D].

None of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following impellers generate a flow parallel to the axis of shaft?
[A].

Axial flow

[B].

Radial flow

[C].

Both (a)and(b)

[D].

None of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: What is the ratio of depth of liquid in vessel to the diameter of tank (H:Dt)?
[A].

1 : 1

[B].

2 : 1

[C].

4 : 1

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: The range of width for the baffle in the fermenter is __________ times of vessel diameter
[A].

1/10 to 1/12

[B].

1/8 to 1/10

[C].

1/5 to 1/8

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the design of a paddle agitator, the ratio of paddle diameter to tank diameter is normally taken as
[A].

0.1

[B].

0.8

[C].

0.25

[D].

0.5

Answer: Option B

Explanation:

No answer description available for this question.