Mechanical Operations

The main size reduction operation in ultrafine grinders is_____________?

Byadmin February 18, 2019August 22, 2021

The main size reduction operation in ultrafine grinders is_____________?

A. Cutting
B. Attrition
C. Compression
D. Impact

Mechanical Operations

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

A. (1/2π). √(g/r)
B. (1/π). √(g/r)
C. ½ √(g/r)
D. 2π. √(g/r)

Read More Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?
Mechanical Operations

Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?

Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?

A. 0.007
B. 0.30
C. 50
D. 0.014

Read More Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?
Mechanical Operations

Which of the following is not an ultrafine grinder (colloid mill) ?

Which of the following is not an ultrafine grinder (colloid mill) ?

A. Micronizers
B. Agitated mills and fluid energy mills
C. Toothed roll crusher
D. Hammer mills with internal classification

Read More Which of the following is not an ultrafine grinder (colloid mill) ?
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

In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?

In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?

A. Square root of the velocity
B. Square of the viscosity
C. Filtration time only
D. Washing time only

Read More In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?
Mechanical Operations

Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟ ?

Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟ ?

A. Bucket conveyor
B. Flight conveyor
C. Screw conveyor
D. Both B. and C.

Read More Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟ ?

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