Mechanical Operations Questions

• As particle size is reduced
• Percentage of drum submerged in the slurry in case of rotary drum filter is
• Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre. )
• Which of the following is a continuous filter?
• For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?
• rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)
• A screen is said to be blinded, when the
• Trommels are revolving screens which normally operate in the range of __________ rpm.
• Maximum size reduction in a fluid energy mill is achieved by
• The process opposite to 'dispersion' is termed as the
• Which of the following minerals is not subjected to magnetic separation method?
• Wheat is ground into flour in a
• To produce talcum powder, use
• Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
• In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.
• Filtration should be stopped in a filter press, if the
• A gravity decanter is meant for the separation of two __________ density.
• The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).
• Pick out the correct statement.
• Pick out the wrong statement: