Mechanical Operations Quiz 6
1 / 50
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?
2 / 50
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is _________ ?
3 / 50
Screen efficiency is________?
4 / 50
Size reduction of ______ is accomplished in steam heated rollers and roll crushers?
5 / 50
Size reduction of ice and gypsum can be accomplished suitably by a ________ crusher?
6 / 50
The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the ______ of the belt?
7 / 50
The controlling resistance in a rotary drum vacuum filter is the _________ resistance?
8 / 50
Sulphuric acid mist is arrested by using a _____ scrubber?
9 / 50
The crushed material received for separation is called feed or__________?
10 / 50
Shell and leaf filter as compared to plate and frame filter _______?
11 / 50
Size reduction of moulding powders, waxes, resins & gums are done in a ________ mill?
12 / 50
Tabular bowl centrifuges as compared to disk bowl centrifuges_____?
13 / 50
Solid particles of different densities are separated by _______?
14 / 50
Sedimentation on commercial scale occurs in______?
15 / 50
Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about_________?
16 / 50
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called___________?
17 / 50
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the_____?
18 / 50
The capacity of a pneumatic conveying system depends upon the ________?
19 / 50
Stamp mills are generally used for crushing___________?
20 / 50
The basic filtration equation is given as dt/dV = (?/A ?P). [(? .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, ? is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
21 / 50
The capacity of a classifier in ?tons of solid/hr? is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ? = density of solids in kg/m3)__________?
22 / 50
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant _______ filtration?
23 / 50
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?
24 / 50
The critical speed of a trommel (N) is related to its dia D. as _______?
25 / 50
Temperature of the product during ultrafine grinding_______?
26 / 50
Tank filter (e.g., Nutsche filter) is_____?
27 / 50
Separation of materials of the same density based on their sizes by using then-different rates of flow is called___________?
28 / 50
Specific surface area is the surface area of a unit ________ of materials?
29 / 50
Soft & non-abrasive materials can be made into fines by__________?
30 / 50
Screw conveyors are_________?
31 / 50
The capacity of a gyratory crusher is _______ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.?
32 / 50
Separation of materials into products based on the difference of their sizes is called_____?
33 / 50
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their__________?
34 / 50
Separation of isotopes is generally done using a/an ________ centrifuge?
35 / 50
Size reduction mechanism used in Jaw crushers is___________?
36 / 50
Size reduction of asbestos and mica is done by______?
37 / 50
The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bond?s law) of the energy to grind the particles from a very large size to 50 ?m is_________?
38 / 50
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond?s law, Rittinger?s law and Kick?s law) depend upon the__________?
39 / 50
Size measurement of ultrafine particles can be best expressed in terms of_____?
40 / 50
Size reduction does not occur due to compression in case of_________?
41 / 50
Solid particles separation based on the difference in their flow velocities through fluids is termed as the___________?
42 / 50
Separation of solid particles based on their densities is called__________?
43 / 50
Size reduction of the _______ can be suitably done by ball mills, crushing rolls and rod mills?
44 / 50
Sphericity of raschig ring (whose length and diameter are equal) is_____?
45 / 50
Supporting legs of a plate and frame filter is normally made of_________?
46 / 50
Screen capacity is proportional to (where, S = screen aperture)______?
47 / 50
The energy consumed by a ball mill depends on___________?
48 / 50
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be ________ cms?
49 / 50
Shape factor for a cylinder whose length equals its diameter is__________?
50 / 50
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a ______ operation?
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