A. Increase
B. Decrease
C. Remain unaffected
D. Increase or decrease depending on the nature of the dust
Related Mcqs:
- The dust collection efficiency of a cyclone separator_________________?
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 - 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 - 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 - At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease depending upon the solubility of the gas in the liquid - With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________?
A. Decreases very rapidly
B. Increases very rapidly
C. Remains constant
D. Increases linearly - The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure?
A. 1.5 to 2
B. 3 to 4
C. 4 to 5
D. > 5 - Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop?
A. 25
B. 50
C. 75
D. 150 - In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ______________ mm of water column per metre height of packing?
A. 25-50
B. 50-75
C. 200-250
D. 750-1000 - For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2
