Mechanical Operations Questions

• Which of the following may prove unsuitable for filtering volatile liquids?
• For classification of potable (drinking) water, we use a __________ filter.
• Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
• __________ mean diameter of particles is given by
• Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size.
• Cake resistance is
• __________ is used for producing a thick suspension from a thin slurry.
• During size reduction by a jaw crusher, the energy consumed decreases with the
• Ultracentrifuges running at speeds upto 100000 rpm is normally used for the
• The energy consumed by a ball mill depends on
• The unit of filter medium resistance is
• Wet seiving is employed, when the product contains __________ materials.
• The filter medium resistance is controlled by
• A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
• Cumulative analysis for determining surface is more precise than differential analysis, because of the
• In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
• To get ultrafine particles, the equipment used is a
• Mass flow of granular solid (M) through a circular opening of dia, D follows
• Separation of materials into products based on the difference of their sizes is called
• __________ mills fall in the category of tumbling mills,