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Mechanical Operations

The important dimensional group involved in the power requirement calculation in mixing operation is the _____________ number?

Mechanical Operations /
The important dimensional group involved in the power requirement calculation in mixing operation is the _____________ number?

A. Reynold’s
B. Froude
C. Both A. & B.
D. Neither A. nor B.

The important dimensional group involved in the power requirement calculation in mixing operation is the _____________ number? Read More »

Mechanical Operations

During agitation of liquids, the_________________?

Mechanical Operations /
During agitation of liquids, the_________________?

A. Froude number is independent for the curves between power number and Reynolds number in
baffled system
B. Power number becomes independent of impellers Reynolds number at high Reynolds number,
but is dependent on the geometry of the impeller
C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the
power number
D. All A., B. and C.

During agitation of liquids, the_________________? Read More »

Mechanical Operations

Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?

Mechanical Operations /
Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?

A. Nc = (1/4π). √(g/R1 – R2)
B. Nc = (1/2π). √(g/R1 – R2)
C. Nc = (1/π). √(g/R1 – R2)
D. Nc = (1/2π). √(R1 – R2/g)

Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ? Read More »

Mechanical Operations

Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a____________________?

Mechanical Operations /
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a____________________?

A. Disc bowl centrifuge
B. Sharpies super-centrifuge
C. Batch basket centrifuge
D. Sparkler filter

Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a____________________? Read More »

Mechanical Operations

In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?

Mechanical Operations /
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?

A. Primary
B. Secondary
C. Fine
D. Ultrafine

In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing? Read More »

Mechanical Operations