Mechanical Operations Quiz 6

1 / 50

**Size reduction of moulding powders, waxes, resins & gums are done in a ________ mill?**

2 / 50

**Size reduction of the _______ can be suitably done by ball mills, crushing rolls and rod mills?**

3 / 50

**Shape factor for a cylinder whose length equals its diameter is__________?**

4 / 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_________?**

5 / 50

**Size measurement of ultrafine particles can be best expressed in terms of_____?**

6 / 50

**Tabular bowl centrifuges as compared to disk bowl centrifuges_____?**

7 / 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___________?**

8 / 50

**Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is _________ ?**

9 / 50

**Sulphuric acid mist is arrested by using a _____ scrubber?**

10 / 50

**Solid particles separation based on the difference in their flow velocities through fluids is termed as the___________?**

11 / 50

**Separation of materials of the same density based on their sizes by using then-different rates of flow is called___________?**

12 / 50

**The capacity of a pneumatic conveying system depends upon the ________?**

13 / 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 ?**

14 / 50

**The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant _______ filtration?**

15 / 50

**Supporting legs of a plate and frame filter is normally made of_________?**

16 / 50

**Screen efficiency is________?**

17 / 50

**Screw conveyors are_________?**

18 / 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)?**

19 / 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?**

20 / 50

**Tank filter (e.g., Nutsche filter) is_____?**

21 / 50

**The critical speed of a trommel (N) is related to its dia D. as _______?**

22 / 50

**Shell and leaf filter as compared to plate and frame filter _______?**

23 / 50

**Sphericity of raschig ring (whose length and diameter are equal) is_____?**

24 / 50

**Screen capacity is proportional to (where, S = screen aperture)______?**

25 / 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)__________?**

26 / 50

**Separation of solid particles based on their densities is called__________?**

27 / 50

**Sedimentation on commercial scale occurs in______?**

28 / 50

**Size reduction of asbestos and mica is done by______?**

29 / 50

**Size reduction of ______ is accomplished in steam heated rollers and roll crushers?**

30 / 50

**Separation of isotopes is generally done using a/an ________ centrifuge?**

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

**Soft & non-abrasive materials can be made into fines by__________?**

33 / 50

**Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a ______ operation?**

34 / 50

**The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be ________ cms?**

35 / 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 ?**

36 / 50

**Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the_____?**

37 / 50

**Size reduction does not occur due to compression in case of_________?**

38 / 50

**Separation of materials into products based on the difference of their sizes is called_____?**

39 / 50

**The crushed material received for separation is called feed or__________?**

40 / 50

**Size reduction mechanism used in Jaw crushers is___________?**

41 / 50

**Size reduction of ice and gypsum can be accomplished suitably by a ________ crusher?**

42 / 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_________?**

43 / 50

**The energy consumed by a ball mill depends on___________?**

44 / 50

**Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their__________?**

45 / 50

**The controlling resistance in a rotary drum vacuum filter is the _________ resistance?**

46 / 50

**Temperature of the product during ultrafine grinding_______?**

47 / 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__________?**

48 / 50

**Stamp mills are generally used for crushing___________?**

49 / 50

**Specific surface area is the surface area of a unit ________ of materials?**

50 / 50

**Solid particles of different densities are separated by _______?**

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