Mechanical Operations Questions

• The distribution given by microscopic analysis of powder is
• If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by
• Pick out the wrong statement.
• Which of the following is a pressure filter?
• The main size reduction operation in ultrafine grinders is
• Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
• Equivalent diameter of a particle is the diameter of the sphere having the same
• Filter aid is used to
• __________ centrifuge is normally used in sugar mills.
• Which of the following is not an ultrafine grinder (colloid mill)?
• Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
• For a non-spherical particle, the sphericity
• Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
• In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
• Pick out the correct statement:
• Froth floatation is the most suitable for treating
• Balls for ball mills are never made of
• Which of the following is not categorised as a "mechanical operation"?
• In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
• In case of a hammer crusher,