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February 2019

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?

Mechanical Operations /
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?

A. > 10
B. < 10
C. > 100
D. < 100

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________? Read More »

Mechanical Operations

In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?

Mechanical Operations /
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?

A. Secondary
B. Fine
C. Primary
D. Ultrafine

In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing? Read More »

Mechanical Operations

Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?

Mechanical Operations /
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?

A. British standard screens
B. German standard screens (DIN 1171) etc
C. American standard screens (ASTM and Tyler standard screens)
D. All A., B. and C.

Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________? Read More »

Mechanical Operations

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?

Mechanical Operations /
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?

A. Vacuum
B. Sand
C. Plate & frame
D. Rotary

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter? Read More »

Mechanical Operations

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?

Mechanical Operations /
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?

A. 200°C and 5 atm
B. 1000°C and 10 atm
C. 500°C and 50 atm
D. 1000°C and 500 atm

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ? Read More »

Mechanical Operations

Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?

Mechanical Operations /
Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?

A. Sorting
B. Sizing
C. Flocculation
D. Elutriation

Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________? Read More »

Mechanical Operations