A. Increases continuously
B. Decreases gradually
C. Remains constant
D. None of these
Related Mcqs:
- The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
A. 10
B. 20
C. 25
D. 30 - During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?
A. At time zero
B. At the end of filtration
C. When half the filtrate has been obtained
D. At the end of filtration, but decreases with time subsequently - 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 - The filtrate flow rate in constant pressure filtration___________________?
A. Continuously increases
B. Continuously decreases
C. Remain constant throughout
D. May increase or decrease; depends on the pressure - In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?
A. Square root of the velocity
B. Square of the viscosity
C. Filtration time only
D. Washing time only - In constant pressure filtration ?
A. Resistance decreases with time
B. Rate of filtration is constant
C. Rate of filtration increases with time
D. Rate of filtration decreases with time - Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
A. Parabola
B. Straight line
C. Hyperbola
D. Exponential curve - Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?
A. P/m = K/ √Dp
B. P/m = K . ln D̅ sa/D̅ sb
C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
D. None of these - In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is__________________?
A. 4
B. 1/4
C. 1
D. 1/2 - 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
