Mechanical Operations Quiz 2
1 / 50
Cartridge filters are termed as ?edge? filters, because of the fact that the__________?
2 / 50
During size reduction by a jaw crusher, the energy consumed decreases with the___________?
3 / 50
Feed size of ? 25 cms can be accepted by _________?
4 / 50
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them ?
5 / 50
During agitation of liquids, the__________?
6 / 50
Cumulative analysis for determining surface is more precise than differential analysis, because of the________?
7 / 50
Energy consumption in a crusher decreases with increase in the__________?
8 / 50
Bond crushing law__________?
9 / 50
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?
10 / 50
Crushing efficiency is the ratio of the ________ ?
11 / 50
As particle size is reduced___________?
12 / 50
Crushing of mineral particles is accomplished in a ?cage mill?, when one or more alloy steel bars are revolved in opposite directions. It is a type of _______ mill?
13 / 50
Crushing efficiency of a machine ranges between ___________ percent?
14 / 50
Colloid mills achieve size reduction mainly by_____?
15 / 50
Diatomaceous earth is a/an__________?
16 / 50
Cake resistance is_____?
17 / 50
Close circuit grinding by a ball mill with air sweeping employs a _________?
18 / 50
Energy consumed for crushing one ton of material ranges from _______ kWh?
19 / 50
Dry powdery solid materials are transported by a _______ conveyor?
20 / 50
Colloidal mills are used for _______ grinding?
21 / 50
As per Taggart?s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ?
22 / 50
Ball mill is used for___________?
23 / 50
During the washing of cake__________?
24 / 50
Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?
25 / 50
As the product becomes finer, the energy required for grinding_____?
26 / 50
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration_____?
27 / 50
Apron conveyors are used for _____ ?
28 / 50
Equivalent diameter of a particle is the diameter of the sphere having the same ___________?
29 / 50
Bucket elevators are not suitable for the vertical lifting of __________ materials?
30 / 50
Dispersion of a gas through liquid is done by using a___________?
31 / 50
Dust laden air can be purified using a______?
32 / 50
Cement clinker is reduced to fine size by a _______?
33 / 50
Energy requirement (per unit mass of material crushed/ground) is highest for___________?
34 / 50
Carbon black is pulverised in a________?
35 / 50
During agitation of liquids, power consumption during laminar flow is not proportional to the _________?
36 / 50
Basic slag is not ground in__________?
37 / 50
Critical speed of rotation, N (in rps ? rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?
38 / 50
During filtration operation, the filtrate encounters the resistance of the _____?
39 / 50
Coal is finally pulverised to 200 mesh size for burning in boilers by a_____?
40 / 50
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?
41 / 50
Compressibility co-efficient for an absolutely compressible cake is________?
42 / 50
All resistances during washing of cake _______?
43 / 50
Choke crushing (in case of a Jaw crusher) compared to free crushing___________?
44 / 50
Balls for ball mills are never made of__________?
45 / 50
Angle of nip of the crushing rolls does not depend upon the________?
46 / 50
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ? = bulk density of material, kg/m3) ?
47 / 50
At low Reynold?s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ?/?N3 D5: Power number Re = ? N D2/?: Reynold?s number N is the impeller rotational speed, and D is the impeller diameter ?
48 / 50
Cyclones are used primarily for separating__________?
49 / 50
Ball mills and tube mills with flint or porcelain balls are used for size reduction of________?
50 / 50
Chance process is used for the_________?
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