Mechanical Operations Quiz 3

1 / 50

**Gold ore concentration is mostly done using_____?**

2 / 50

**Fluid medium used in the classification technique of mineral beneficiation is__________?**

3 / 50

**Filtration rate does not depend upon the_________?**

4 / 50

**For transporting pasty material, one will use a/an___________?**

5 / 50

**Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the ______ filtration?**

6 / 50

**For sizing of fine materials, the most suitable equipment is a______?**

7 / 50

**For spheres, volume shape factor is given by______?**

8 / 50

**Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to _____ and the cycle time (where, ? = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?**

9 / 50

**For efficient grinding, ball mills must be operated___________?**

10 / 50

**For crushing of solids, the Rittinger?s law states that the work required for crushing is proportional to ___________?**

11 / 50

**For classification of potable (drinking) water, we use a ________ filter?**

12 / 50

**For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the _______ filter?**

13 / 50

**Gravity settling process is not involved in the working of a_________?**

14 / 50

**Float and sink test determines the possibility of cleaning of coal by a process based on the_____?**

15 / 50

**Grizzlies are used for separating ______ solids?**

16 / 50

**For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is___________?**

17 / 50

**Filtration should be stopped in a filter press, if the__________?**

18 / 50

**For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately ______ microns?**

19 / 50

**Filter medium resistance is important during the _______ of filtration?**

20 / 50

**Grinding characteristic of a material is given by its_____?**

21 / 50

**For the preliminary breaking of hard rock, we use a______?**

22 / 50

**Froth floatation is the most suitable for treating ______?**

23 / 50

**For benefication of iron ore, the most commonly used method is_______?**

24 / 50

**For the transportation of ultrafine particles, the equipment used is a _____ conveyor?**

25 / 50

**General crushing equation is given by d(P/m) = -K (dD? S/D? n S). Bond?s crushing law is obtained by solving this equation for n = ______ and feed of infinite size?**

26 / 50

**Grindability of a material does not depend upon its_______?**

27 / 50

**Fick?s law relates to__________?**

28 / 50

**For separation of sugar solution from settled out mud, we use a _____ filter?**

29 / 50

**Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance ? = viscosity of the filtrate) ?**

30 / 50

**Filtration of water in a paper mill is done by a/an ________ filter?**

31 / 50

**Np ? 1/NRe choiceno C Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a _______ conveyor?**

32 / 50

**For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ?**

33 / 50

**For coarse reduction of hard solids, use ______?**

34 / 50

**Fibrous material is broken by a___________?**

35 / 50

**Gelatinous solid (which plug the septum) can be filtered by a ______ filter?**

36 / 50

**For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?**

37 / 50

**Filter aid is used to______?**

38 / 50

**For spheres, the specific surface shape factor is given by_____?**

39 / 50

**For a non-spherical particle, the sphericity___________?**

40 / 50

**General mechanism of size reduction in intermediate and fine grinder is by ___________?**

41 / 50

**Fluid energy mill comes in the category of_________?**

42 / 50

**Grinding efficiency of a ball mill is of the order of ________ percent?**

43 / 50

**For raschig rings, the sphericity is_______?**

44 / 50

**For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as__________?**

45 / 50

**For achieving maximum capacity of the ball mill, the ball charge should be equal to about _______ percent of the ball mill volume?**

46 / 50

**Filter medium resistance is that offered by the___________?**

47 / 50

**Gravity stamp mill is meant for the _____ crushing?**

48 / 50

**Flow of filtrate through the cake in a plate and frame filter press is best described by the _______ equation?**

49 / 50

**Gyratory crushers compared to the reciprocating jaw crushers___________?**

50 / 50

**Filtration capacity of a rotary drum vacuum filter depends upon the________?**

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