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Mechanical Operations

In screen analysis, the notation +5 mm/-10 mm means particles passing through ____________________?

Mechanical Operations /
In screen analysis, the notation +5 mm/-10 mm means particles passing through ____________________?

A. 10 mm screen and retained on 5 mm screen
B. 5 mm screen and retained on 10 mm screen
C. Both 5 mm and 10 mm screens
D. Neither 5 mm nor 10 mm screen

In screen analysis, the notation +5 mm/-10 mm means particles passing through ____________________? Read More »

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 ?

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 ?

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

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 ? Read More »

Mechanical Operations

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?

Mechanical Operations /
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?

A. > 10
B. < 10
C. > 100
D. < 100

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________? Read More »

Mechanical Operations

In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?

Mechanical Operations /
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?

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

In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing? Read More »

Mechanical Operations