Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.5
Po ∝ Re-1.0
Po ∝ Re1.0
Po ∝ Re0.0

ANSWER DOWNLOAD EXAMIANS APP

Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

British standard screens
American standard screens (ASTM and Tyler standard screens)
All of these
German standard screens (DIN 1171) etc

ANSWER DOWNLOAD EXAMIANS APP

Mechanical Operations
Work index is defined as the

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Energy needed to crush one ton of feed to 100 microns
Energy needed to crush one tonne of feed to 200 microns

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Mechanical Operations