A. Decreases with increase in gas flow rate
B. Is inversely proportional to the mass of the dust particle
C. Is directly proportional to the radius of the dust particle path
D. None of these
Related Mcqs:
- With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________________?
A. Increase
B. Decrease
C. Remain unaffected
D. Increase or decrease depending on the nature of the dust - The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?
A. Gas flow rate
B. Electrode area
C. Both A. & B.
D. Neither A. nor B. - For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical axis is given as 1.0; while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylindrical vessel, what value of weld joint efficiency should be used ?
A. 0.8
B. 0.9
C. 1.0
D. (0.8)0.5 - Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?
A. η = 17 – 61.1 log μ
B. η = 24.6 (Δp/μ)
C. η = 1.66 – 0.25 log μ
D. η = 0.25 log μ – 1.67 - Stage efficiency for packed tower varies with the____________________?
A. Type & size of packing
B. Fluid rates and fluid properties
C. Operating pressure and column diameter
D. All A., B. and C. - A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by_______________?
A. (ph – dh)/ph
B. (ph – dh . dt/2)/ph
C. (ph – dt)/ph
D. (ph – dh)/dh - Joint efficiency (J) for a seamless pipe is_______________?
A. 1
B. 0.85
C. 1.5
D. < 0.5 - A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?
A. 45
B. 60
C. 80
D. 95 - An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________?
A. An increase in liquid viscosity
B. An increase in relative volatility for rectification columns
C. Decrease in gas solubility for absorbers
D. All A., B. and C. - Overall tray efficiency of a distillation column is the ratio of the number of ___________________?
A. Overall gas transfer units to the number of ideal trays required
B. Ideal trays required to the number of real trays required
C. Real trays required to the number of ideal trays required
D. None of these
