A. Mixing highly viscous pastes
B. Blending immiscible liquids
C. Mixing liquids at very high temperature (> 250 °C)
D. None of these
Related Mcqs:
- Screw conveyors are________________?
A. Run at very high rpm
B. Suitable for sticky materials
C. Suitable for highly abrasive materials
D. All A., B. and C. - 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 - Pick out the wrong statement pertaining to the turbine agitator ?
A. Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
B. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
C. Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while
the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator
diameter)
D. Turbine agitator should be located at a height not less than one agitator diameter length from
the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two
agitators should be used - About 2-3 hp, power per gallon of a thin liquid provides vigorous agitation in an agitator. ‘Power number’ in agitation is given by __________________?
A. P. gc/n3. D2. ρ
B. P. gc. ρ/μ2
C. n3. D3. ρ/P. gc
D. P. gc/n2. D2. ρ - 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 - Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?
A. Constant rate
B. Varying pressure
C. Varying rate
D. Constant pressure - In case of a ball mill ?
A. Coarse feed requires a larger ball
B. Fine feed requires a larger ball
C. Operating speed should be more than the critical speed
D. None of these - With increase in the capacity of screens, the screen effectiveness__________________?
A. Remains unchanged
B. Increases
C. Decreases
D. Decreases exponentially - A filter press is___________________?
A. A batch filter
B. Not suitable, if the liquid is the main product
C. Having prohibitively high maintenance cost
D. Not suitable for wide range of materials under varying operating conditions of cake thickness
and pressure - Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
A. Bond’s crushing law
B. Kick’s law
C. Rittinger’s law
D. None of these
