Mechanical Operations Questions

• Agitation similitude — Froude, Reynolds, and power number:\nDuring liquid agitation in baffled tanks, which set of statements about dimensionless groups and power correlations is correct?
• Pick the wrong statement — cakes and explosive materials:\nIdentify the incorrect statement among the following about filtration cakes and crushing practice.
• Closed-circuit vs open-circuit grinding:\nCompared with open-circuit operation, which statement about closed-circuit grinding is generally true?
• Pick the wrong statement — size-reduction mechanisms and jaw crushers:\nIdentify the incorrect statement about crushing mechanisms and jaw-crusher types.
• Best filter for tiny precipitate from very large water volumes:\nWhich filter type is most suitable for removing a very small amount of precipitate from very large volumes of water?
• Not a tumbling (revolving) mill:\nWhich of the following is NOT classified as a tumbling/revolving mill for size reduction?
• Best conveyor for gummy and sticky materials (e.g., molasses, sugar pastes):\nWhich conveyor is generally preferred for transporting sticky, pasty materials?
• Gravity stamp mill duty:\nA gravity stamp mill is primarily intended for which stage of crushing?
• Ribbon blenders — intended service:\nRibbon blenders are designed primarily for which type of mixing duty?
• Taylor 200-mesh opening (screen size conversion):\nWhat is the nominal opening of a 200-mesh screen in the Taylor series?
• Cake washing behavior — resistance trends:\nDuring the washing of a formed filter cake under steady conditions, which statement best reflects what typically happens?
• Coal washability (float–sink) curves:\nA washability curve derived from float-and-sink tests primarily assesses cleanability based on which property?
• Role of the fluid energy (jet) mill:\nA fluid energy mill is chiefly used for which comminution duty?
• Dust removal from gas using wire mesh:\nMetallic wire mesh as a filtering medium for dust-laden gas is characteristic of which device?
• Stage identification from size range:\nFeed size 300–1500 mm reduced to product 100–300 mm corresponds to which crushing stage?
• Name of density-based separation:\nSeparation of solid particles primarily according to their densities is called what?
• Making fines from soft, non-abrasive materials:\nWhich mechanism is best suited to produce fines from soft, non-abrasive solids?
• Specific cake resistance for incompressible sludges:\nHow does the specific cake resistance of an incompressible sludge depend on pressure drop ΔP across the cake?
• Paddle agitator characteristics:\nWhich statement best describes the typical operating domain of a paddle agitator?
• In mineral processing, which equipment is classified as a coarse crusher because it handles large feed sizes and performs primary crushing before secondary reduction stages?