Mechanical Operations Questions

• Helical screw agitator is used for
• What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
• Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
• Mixing of plastic solids is generally facilitated by
• For raschig rings, the sphericity is
• Which of the following is not a wet classifier?
• The mechanism of size reduction by a hammer mill is by impact and attrition between the
• Which of the following must be stored in silos and not in open yard?
• Handling of ashes and similar materials can be done best by a __________ conveyor.
• __________ baffles are provided in ball mills.
• In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))
• Grinding characteristic of a material is given by its
• A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is
• In froth floatation, chemical agent added to cause air adherence is called
• Velocity of a small particle of diameter 'Dp' at a distance 'r' from the rotational axis of a cyclone rotating at an angular speed 'ω' is given by (the other symbols are as per standard notation)
• __________ mills are termed as disintegrators.
• A cottrel precipitator makes use of the __________ for dusty air cleaning.
• The sphericity of a solid particle of cubical shape is
• Compressibility co-efficient for an absolutely compressible cake is
• In a roll crusher, the specific power consumption and the production rate is affected by the