During agitation of liquids, the_________________?

A. Froude number is independent for the curves between power number and Reynolds number in
baffled system
B. Power number becomes independent of impellers Reynolds number at high Reynolds number,
but is dependent on the geometry of the impeller
C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the
power number
D. All A., B. and C.

Related Mcqs:

During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?
A. Density of the liquid
B. Viscosity of the liquid
C. Cube of impeller diameters
D. Square of rotational speed
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
Which of the following is not accomplished by agitation of liquids in agitators ?
A. Dispersing gas in liquid
B. Blending of immiscible liquids
C. Dispersing immiscible liquid in form of emulsion
D. Suspending solid particles
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
Power consumption during turbulent flow in agitation tank is proportional to the ______________ of the liquid?
A. Viscosity
B. Thermal conductivity
C. Surface tension
D. Density
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?
A. 0.5 D
B. D
C. 1.5 D
D. 2 D
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?
A. Propeller
B. Helical screw
C. Flat blade turbine
D. Curved blade turbine
Which of the following may prove unsuitable for filtering volatile liquids ?
A. Pressure filter
B. Gravity filter
C. Centrifugal filter
D. Vacuum filter
Which of the following is not used as a filter medium in case of corrosive liquids?
A. Nylon
B. Glass cloth
C. Metal cloth of monel or stainless steel
D. Cotton fabric
Highly viscous liquids & pastes are agitated by________________?
A. Propellers
B. Turbine agitators
C. Multiple blade paddles
D. None of these