Mechanical Operations

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

Byadmin February 18, 2019August 22, 2021

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

A. Jet mills
B. Fluid energy mill
C. Micronizer
D. All A., B. and C.

Mechanical Operations

The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?

The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?

A. 6.35 kWh/ton
B. 9.0 kWh/ton
C. 18 kWh/ton
D. 25.4 kWh/ton

Read More The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
Mechanical Operations

Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?

Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?

A. Sand bed filter
B. Plate and frame filter press
C. Vacuum filter
D. Batch basket centrifuge

Read More Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?
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

Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?

Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?

A. Drag
B. Ribbon
C. Screw
D. Slat

Read More Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?
Mechanical Operations

A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________?

A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________?

A. 0.1
B. 0.4
C. 0.6
D. None of these

Read More A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________?
Mechanical Operations

_____________________ baffles are provided in ball mills ?

_____________________ baffles are provided in ball mills ?

A. Horizontal
B. No
C. Only two
D. None of these

Read More _____________________ baffles are provided in ball mills ?

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