Biochemical Engineering

Question: The power consumption in a stirring vessel can be assessed by using a
[A].

dynamometer

[B].

strain gauge attached to agitator shaft

[C].

watt meter attached to agitator motor

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: The power required by an agitator operating in a gas-sparged system is
[A].

lesser than the power required by an impeller in operating at same speed in a gas free system

[B].

more than the power required by an impeller in operating at same speed in a gas free system

[C].

same as the power required by an impeller in operating at same speed in a gas free system

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following(s) is/are non-mechanically agitated reactors?
[A].

Stirrer tank reactor

[B].

Bubble column

[C].

Air lift reactor

[D].

Both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Industrial paddle agitators turn at the speed of
[A].

20 and 150 rpm

[B].

150 and 300 rpm

[C].

400 and 800 rpm

[D].

1150 rpm

Answer: Option A

Explanation:

No answer description available for this question.

Question: Larger propellers turn at the speed of
[A].

20 to 150 rpm

[B].

150 to 300 rpm

[C].

400 to 800 rpm

[D].

1150 rpm

Answer: Option C

Explanation:

No answer description available for this question.

Question: Small propellers turn at the speed of either
[A].

20 or 150 rpm

[B].

150 or 300 rpm

[C].

400 or 800 rpm

[D].

1150 rpm or 1750 rpm

Answer: Option D

Explanation:

No answer description available for this question.

Question: Flooding is a condition/phenomenon which occur in a bioreactor when
[A].

The air escapes without being distributed by the agitator

[B].

The fermenter medium spills out the reactor due to foaming

[C].

The volume of foam is more than the volume of broth

[D].

None of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?
[A].

Anemometer

[B].

Manometer

[C].

Tachometer

[D].

Barometer

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following stirrer requires least amount of energy for same yield?
[A].

Mig

[B].

Intermig

[C].

Turbine

[D].

Disc

Answer: Option B

Explanation:

No answer description available for this question.

Question: What is/are the major difference(s) between disc and turbine type stirrer?
[A].

Blades in disc type are projected out beyond the edge of disc while blades are curved one in turbine type

[B].

Turbine type requires 50 % less air than disc type for the same yield and energy consumption

[C].

Both (a) and (b)

[D].

Number of blades in the stirrer

Answer: Option C

Explanation:

No answer description available for this question.