In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

A

Segmental baffle

B

Flat plate extending across the wall

C

Disk type baffle

D

Helical type baffle

A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A

Remain horizontal

B

Slant up towards direction of pull

C

Slant down towards direction of pull

D

None of the above

In leaf springs, the maximum bending stress developed in the plates is (where W = Load acting on the spring, $$l$$ = Span of the spring, n = Number of plates, b = Width of plates and t = Thickness of plates)

A

$$\frac{{{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$

B

$$\frac{{3{\text{W}}l}}{{2{\text{nb}}{{\text{t}}^2}}}$$

C

$$\frac{{2{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$

D

$$\frac{{3{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$

The main function of baffles provided in a shell and tube heat exchanger is to

A

Facilitate the cleaning of outer tube surface

B

Enhance turbulence

C

Hold the tubes in position

D

All of the above

In a shell and tube heat exchanger, baffles are provided on the shell side to

A

Improve heat transfer

B

Provide support for tubes

C

Prevent stagnation of shell side fluid

D

All of these

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

A

Providing support for the tubes

B

Improving heat transfer

C

Both A & B

D

Preventing the fouling of tubes & stagnation of shell side fluid

Baffles in mixing tanks are provided to

A

Reduce swirling and vortex formation

B

Increase the structural strength of the tank

C

Aid in rotational flow

D

None of these

Baffles are provided in heat exchangers to increase the

A

Fouling factor

B

Heat transfer area

C

Heat transfer co-efficient

D

Heat transfer rate

__________ baffles are provided in ball mills.

A

Horizontal

B

No

C

Only two

D

None of these

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

A

Reducing scale deposition

B

Increasing pressure drop

C

Fixing the tubes

D

Creating turbulence

In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in

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