Mechanical Operations Quiz 8
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Which one is a filter aid ?
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Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?
3 / 83
Which of the following is used for primary crushing of very hard lumpy materials ?
4 / 83
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?
5 / 83
Vacuum is applied in ________ zone, in case of a general type continuous rotary drum vacuum filter?
6 / 83
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?
7 / 83
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?
8 / 83
Which of the following terminology is not used for size reduction of materials to fine sizes or powders ?
9 / 83
Which of the following achieves the least reduction ratio for a given feed size ?
10 / 83
Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
11 / 83
Use of ?grinding aids? is done in ________ grinding?
12 / 83
Work index is defined as the__________?
13 / 83
Wet grinding in a revolving mill _______ as compared to dry grinding ?
14 / 83
Vertical transportation of materials can be done by a/an________?
15 / 83
Which of the following is the most suitable for handling fibrous and dense slurries ?
16 / 83
Vibrating screens have capacity in the range of _______ tons/ft2 .mm mesh size?
17 / 83
Two particles are called to be equal settling, if they are having the same ?
18 / 83
Which of the following mineral dressing operations is termed as ?comminution??
19 / 83
Which of the following mechanical conveyors does not come under the division ?scrapers? ?
20 / 83
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
21 / 83
Vacuum filter is most suitable for the________?
22 / 83
Use of baffles in agitators help in minimising the _______ tendency?
23 / 83
With increase in drum speed, in a rotary drum filter, the filtration rate________?
24 / 83
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_______?
25 / 83
Trommels separate a mixture of particles depending on their_______?
26 / 83
Which of the following must be stored in silos and not in open yard ?
27 / 83
Which of the following relationships between co-efficient of friction (?) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
28 / 83
Which of the following is a fine crusher ?
29 / 83
Wet sieving is employed, when the product contains _________ materials?
30 / 83
Tube mill compared to ball mill_________?
31 / 83
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with _______ to get the same for dry grinding?
32 / 83
Which of the following is not used as a surface active agent in a flocculation operation ?
33 / 83
Which of the following is not an industrial screening equipment ?
34 / 83
Which of the following oxides is not present in hematite iron ore ?
35 / 83
Which of the following conveyors cannot be recommended for transportation of abrasive materials ?
36 / 83
Width and speed of a conveyor belt depends upon the _______ of the material?
37 / 83
Velocity of a small particle of diameter ?Dp? at a distance ?r? from the rotational axis of a cyclone rotating at an angular speed ??? is given by (the other symbols are as per standard notation) ?
38 / 83
Which of the following is not a cutting machine ?
39 / 83
Which of the following is not accomplished by agitation of liquids in agitators ?
40 / 83
Which of the following mechanical conveyors does not come under the division ?carriers? ?
41 / 83
Which is the most suitable conveyor for transportation of sticky material ?
42 / 83
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
43 / 83
Which of the following equations is Rittinger?s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D? sa & D? sb = volume surface mean diameter of feed & product respectively) ?
44 / 83
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_______?
45 / 83
Ultrafine grinders operate principally by__________?
46 / 83
Which of the following gives the crushing energy required to create new surface ?
47 / 83
Which of the following clay mixing devices is vacuum operated for deairation of clay ?
48 / 83
Ultra centrifuges are used for the separation of ______ solid particles?
49 / 83
Which of the following is not a non-metalliferous mineral ?
50 / 83
Which of the following is not categorised as a ?mechanical operation??
51 / 83
Wheat is ground into flour in a_____?
52 / 83
Which of the following minerals is not subjected to magnetic separation method ?
53 / 83
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
54 / 83
Which of the following is a continuous filter ?
55 / 83
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?
56 / 83
Which of the following screens has the maximum capacity ?
57 / 83
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge_________?
58 / 83
Which of the following is a vacuum filter ?
59 / 83
Which of the following is not used as filter aid ?
60 / 83
Which of the following is a batch sedimentation equipment ?
61 / 83
Weber number is significant and is concerned with the__________?
62 / 83
What is the reduction ratio in a fine crushing operation having following feed and product sizes ?
63 / 83
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
64 / 83
Which of the following is not a revolving/tumbling mill used for size reduction ?
65 / 83
Which of the following is a pressure filter ?
66 / 83
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the______?
67 / 83
Which of the following may prove unsuitable for filtering volatile liquids ?
68 / 83
What is the selectivity index, if the grade of tailings & concentrate is the same ?
69 / 83
Use of grinding aids results in the _____?
70 / 83
Which of the following is not a part of the Blake jaw crusher ?
71 / 83
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a______?
72 / 83
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
73 / 83
Which of the following is the softest material ?
74 / 83
Which of the following comes in the category of primary crusher for hard and tough stone ?
75 / 83
Which of the following is not used as a filter medium in case of corrosive liquids?
76 / 83
Xanthates are used in the froth floatation process as a/an _________?
77 / 83
Which of the following can be most effectively used for clarification of lube oil and printing ink ?
78 / 83
Which of the following is the hardest material ?
79 / 83
With increase in the capacity of screens, the screen effectiveness___________?
80 / 83
Which of the following is not an ultrafine grinder (colloid mill) ?
81 / 83
Which of the following is a coarse crusher ?
82 / 83
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
83 / 83
Which is a secondary crusher for a hard & tough stone ?
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