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February 2019

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?

A. Bag filter
B. Electrostatic precipitator
C. Cyclone separator
D. Wet scrubber

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________? Read More »

Mechanical Operations

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?

A. Constant rate
B. Varying pressure
C. Varying rate
D. Constant pressure

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration? Read More »

Mechanical Operations

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

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_________________?

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) ?

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____________________?

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