Mechanical Operations

The controlling resistance in a rotary drum vacuum filter is the ________________ resistance?

Byadmin February 18, 2019August 22, 2021

The controlling resistance in a rotary drum vacuum filter is the ________________ resistance?

A. Pig
B. Cake
C. Filter medium
D. None of these

Mechanical Operations

For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?

For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?

A. 10
B. 25
C. 50
D. 75

Read More For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?
Mechanical Operations

At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?

At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?

A. Po ∝ Re-1.0
B. Po ∝ Re0.0
C. Po ∝ Re0.5
D. Po ∝ Re1.0

Read More At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?
Mechanical Operations

____________ mills fall in the category of tumbling mills ?

____________ mills fall in the category of tumbling mills ?

A. Ball and pebble
B. Rod and tube
C. Compartment
D. All A., B. & C.

Read More ____________ mills fall in the category of tumbling mills ?
Mechanical Operations

Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?

Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?

A. Asbestos
B. Rubber
C. Non-metallic ores
D. Limestone

Read More Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?
Mechanical Operations

Separation of materials into products based on the difference of their sizes is called___________________?

Separation of materials into products based on the difference of their sizes is called___________________?

A. Sizing
B. Sorting
C. Classification
D. Flocculation

Read More Separation of materials into products based on the difference of their sizes is called___________________?
Mechanical Operations

Cake resistance is___________________?

Cake resistance is___________________?

A. Important in the beginning of filtration
B. Decreased with the time of filtration
C. Independent of pressure drop
D. None of these

Read More Cake resistance is___________________?

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