Mechanical Operations

Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?

Byadmin February 18, 2019August 22, 2021

Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?

A. Gravity separation
B. Wettability
C. Particle shape
D. None of these

Mechanical Operations

Tank filter (e.g., Nutsche filter) is___________________?

Tank filter (e.g., Nutsche filter) is___________________?

A. A high pressure filter
B. A continuous filter
C. Used for small scale filtration work
D. A leaf filter

Read More Tank filter (e.g., Nutsche filter) is___________________?
Mechanical Operations

In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?

In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?

A. Plug
B. Turbulent
C. Laminar
D. None of these

Read More In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?
Mechanical Operations

What is the selectivity index, if the grade of tailings & concentrate is the same ?

What is the selectivity index, if the grade of tailings & concentrate is the same ?

A. 0
B. ∞
C. 1
D. 0.5

Read More What is the selectivity index, if the grade of tailings & concentrate is the same ?
Mechanical Operations

Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?

Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?

A. 0.2 to 0.8
B. 5 to 25
C. 50 to 100
D. 100 to 250

Read More Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?
Mechanical Operations

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

A. Compartment mill
B. Rod mill
C. Pebble mill
D. Tube mill

Read More Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
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 ?

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