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February 2019

Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

Mechanical Operations /
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

A. 0.01 L.S
B. 0.087 L.S
C. L.S
D. L.S/0.087

Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ? Read More »

Mechanical Operations

Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?

Mechanical Operations /
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?

A. Carbonates
B. Sulphates
C. Silicates & phosphates
D. Bi-carbonates

Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________? Read More »

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