Mechanical Operations Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed? Wet grinding in low viscous suspension Dry grinding of large particles (upto 1.25 cms) Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills Wet grinding in low viscous suspension Dry grinding of large particles (upto 1.25 cms) Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Trommels are revolving screens which normally operate in the range of __________ rpm. 43832 15 - 20 60 - 75 40 - 50 43832 15 - 20 60 - 75 40 - 50 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations 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 N² N¹ N° N³ N² N¹ N° N³ ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations During the washing of cake Cake resistance decreases Filter medium resistance increases Filter medium resistance decreases All the resistances are constant Cake resistance decreases Filter medium resistance increases Filter medium resistance decreases All the resistances are constant ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The value of 'angle of nip' is generally about 16° 52° 32° 64° 16° 52° 32° 64° ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations 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 ). 1/μ² 1/√μ √μ 1/μ 1/μ² 1/√μ √μ 1/μ ANSWER DOWNLOAD EXAMIANS APP
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