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

Byadmin February 18, 2019August 22, 2021

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

Mechanical Operations

Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?

Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?

A. P/m = K/ √Dp
B. P/m = K . ln D̅ sa/D̅ sb
C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
D. None of these

Read More Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?
Mechanical Operations

For classification of potable (drinking) water, we use a _______________ filter?

For classification of potable (drinking) water, we use a _______________ filter?

A. Gravity sand
B. Plate and frame
C. Vacuum leaf
D. Rotary vacuum

Read More For classification of potable (drinking) water, we use a _______________ filter?
Mechanical Operations

For a non-spherical particle, the sphericity__________________?

For a non-spherical particle, the sphericity__________________?

A. Is defined as the ratio of surface area of a sphere having the same volume as the particle to the
actual surface area of the particle
B. Has the dimension of length
C. Is always less than 1
D. Is the ratio of volume of a sphere having the same surface area as the particle to the actual
volume of the particle

Read More For a non-spherical particle, the sphericity__________________?
Mechanical Operations

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?

A. d
B. √d
C. d2
D. 1/d

Read More For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
Mechanical Operations

Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?

Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?

A. Plane
B. Curved
C. Ribbed
D. Either A. or B.

Read More Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?
Mechanical Operations

In constant pressure filtration ?

In constant pressure filtration ?

A. Resistance decreases with time
B. Rate of filtration is constant
C. Rate of filtration increases with time
D. Rate of filtration decreases with time

Read More In constant pressure filtration ?

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