Mechanical Operations Quiz 1
1 / 50
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are_________?
2 / 50
A pebble mill__________?
3 / 50
A tube mill as compared to a ball mill___________?
4 / 50
According to Bond crushing law, the work required to form particle of size ?D? from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively) ?
5 / 50
__________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc?
6 / 50
________ centrifuge is the most suitable for separation of non-friable crystals?
7 / 50
A filter press is_____?
8 / 50
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ?L) located at a radial distance R from the axis of rotation. The thickness of the liquid film is ? and no cake is formed. The initial pressure drop during filtration is _____?
9 / 50
_____ mills fall in the category of tumbling mills ?
10 / 50
________ balls capable of grinding the feed in a ball mill gives the maximum efficiency ?
11 / 50
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for ________ flow of filtrate?
12 / 50
A fluid energy mill is used for ___________?
13 / 50
______ are mixed using ribbon blenders ?
14 / 50
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is__________?
15 / 50
A ________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?
16 / 50
________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution?
17 / 50
A screen is said to be blinded, when the_____?
18 / 50
______ mills are termed as impactors?
19 / 50
______ is the most suitable for compounding rubber and plastic solids ?
20 / 50
_______ mill is not a revolving mill ?
21 / 50
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
22 / 50
A tube mill compared to a ball mill___________?
23 / 50
________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?
24 / 50
_______ is used for producing a thick suspension from a thin slurry?
25 / 50
A cottrell precipitator makes use of the _______ for dusty air cleaning?
26 / 50
A compressible cake has the__________?
27 / 50
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator ?
28 / 50
_______ mean diameter of particles is given by ? (xi/Dpi ?)?
29 / 50
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 ?m/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is__________?
30 / 50
A widely used size reduction equipment for _______ is Bradford breaker?
31 / 50
________ is a cohesive solid ?
32 / 50
A fluid energy mill is used for__________?
33 / 50
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is______?
34 / 50
______ conveyors are also called scrapers?
35 / 50
______ mills are termed as disintegrators?
36 / 50
200 mesh screen means 200 openings per_______?
37 / 50
A ______ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end?
38 / 50
________ mill is not used for grinding wheat into flour and for milling of cereals & other ? vegetable products.
39 / 50
_______ baffles are provided in ball mills ?
40 / 50
According to Taggart?s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than________?
41 / 50
________ mill is normally used for grinding of talc?
42 / 50
A belt conveyor used for the transportation of materials can_____?
43 / 50
200 mesh sieve size corresponds to ______ microns?
44 / 50
A ______ mixer resembles a ball mill without balls?
45 / 50
Additives used for promoting the flocculation of particles is a/an _______?
46 / 50
______ Centrifuge is normally used in sugar mills?
47 / 50
A propeller agitator________?
48 / 50
_____ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
49 / 50
Addition of filter aid to the slurry before filtration is done to ________ of the cake?
50 / 50
_______ are used for the separation of coarse particles from a slurry of fine particles?
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