A. Density of the liquid
B. Viscosity of the liquid
C. Cube of impeller diameters
D. Square of rotational speed
Related Mcqs:
- 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 - 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 - 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 - 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. - 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 - The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________?
A. N°
B. N1
C. N2
D. N3 - 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 - For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?
A. Kozeny-Carman equation
B. Leva’s equation
C. Blake-Plummer equation
D. None of these - In a roll crusher, the specific power consumption and the production rate is affected by the_________________?
A. Reduction ratio
B. Differential roll speed
C. Both A. and B.
D. Neither A. nor B. - Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?
A. √μ
B. 1/√μ
C. 1/μ
D. 1/μ2
