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
Month: February 2019
_______________ centrifuge is the most suitable for separation of non-friable crystals?
_______________ centrifuge is the most suitable for separation of non-friable crystals?
A. Tubular bowl
B. Disc-bowl
C. Perforated horizontal basket continuous
D. Suspended batch basket
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?
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
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__________________?
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.
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?
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
Which of the following gives the crushing energy required to create new surface ?
Which of the following gives the crushing energy required to create new surface ?
A. Taggarts rule
B. Fick’s law
C. Rittinger’s Law
D. None of these
Sphericity of raschig ring (whose length and diameter are equal) is___________________?
Sphericity of raschig ring (whose length and diameter are equal) is___________________?
A. > 1
B. < 1
C. 1
D. 2
Energy consumed for crushing one ton of material ranges from ______________ kWh?
Energy consumed for crushing one ton of material ranges from ______________ kWh?
A. 0.01 to 0.1
B. 0.5 to 1.5
C. 2 to 3.5
D. 4 to 5
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 ?
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
Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?
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