Mechanical Operations Tabular bowl centrifuges as compared to disk bowl centrifuges Operate at higher speed Employ bowl of larger diameter Can not be operated under pressure/vacuum Can't be used for separation of fine suspended solids from a liquid Operate at higher speed Employ bowl of larger diameter Can not be operated under pressure/vacuum Can't be used for separation of fine suspended solids from a liquid ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following is not an ultrafine grinder (colloid mill)? Agitated mills and fluid energy mills Toothed roll crusher Hammer mills with internal classification Micronizers Agitated mills and fluid energy mills Toothed roll crusher Hammer mills with internal classification Micronizers ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake) ∝ √ΔP Independent of ΔP ∝ ΔP ∝ 1/ ΔP ∝ √ΔP Independent of ΔP ∝ ΔP ∝ 1/ ΔP ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The filtrate flow rate in constant pressure filtration May increase or decrease ; depends on the pressure Continuously decreases Continuously increases Remains constant throughout May increase or decrease ; depends on the pressure Continuously decreases Continuously increases Remains constant throughout ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Optimum ratio of operating speed to critical speed of a trommel is 0.33-0.45 1.33-1.45 1.5-2.5 0.5-2 0.33-0.45 1.33-1.45 1.5-2.5 0.5-2 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) 3.6 V.W.Dr/ρ 3.6 V.W.Dr.ρ 3.6 V.W. ρ 3.6 W.Dr.ρ 3.6 V.W.Dr/ρ 3.6 V.W.Dr.ρ 3.6 V.W. ρ 3.6 W.Dr.ρ ANSWER DOWNLOAD EXAMIANS APP
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