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Mechanical Operations Quiz 2

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Mechanical Operations Quiz 2

1 / 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 ?

2 / 50

Cyclones are used primarily for separating__________?

3 / 50

Dry powdery solid materials are transported by a _______ conveyor?

4 / 50

Bond crushing law__________?

5 / 50

Cake resistance is_____?

6 / 50

Ball mill is used for___________?

7 / 50

During agitation of liquids, power consumption during laminar flow is not proportional to the _________?

8 / 50

Close circuit grinding by a ball mill with air sweeping employs a _________?

9 / 50

Crushing efficiency of a machine ranges between ___________ percent?

10 / 50

Balls for ball mills are never made of__________?

11 / 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) ?

12 / 50

Dust laden air can be purified using a______?

13 / 50

Diatomaceous earth is a/an__________?

14 / 50

During agitation of liquids, the__________?

15 / 50

Energy requirement (per unit mass of material crushed/ground) is highest for___________?

16 / 50

Cement clinker is reduced to fine size by a _______?

17 / 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) ?

18 / 50

Chance process is used for the_________?

19 / 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) ?

20 / 50

Apron conveyors are used for _____ ?

21 / 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 ?

22 / 50

Choke crushing (in case of a Jaw crusher) compared to free crushing___________?

23 / 50

Colloid mills achieve size reduction mainly by_____?

24 / 50

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration_____?

25 / 50

Feed size of ? 25 cms can be accepted by _________?

26 / 50

All resistances during washing of cake _______?

27 / 50

As the product becomes finer, the energy required for grinding_____?

28 / 50

Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them ?

29 / 50

Ball mills and tube mills with flint or porcelain balls are used for size reduction of________?

30 / 50

Bucket elevators are not suitable for the vertical lifting of __________ materials?

31 / 50

Equivalent diameter of a particle is the diameter of the sphere having the same ___________?

32 / 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.) ?

33 / 50

Coal is finally pulverised to 200 mesh size for burning in boilers by a_____?

34 / 50

Crushing efficiency is the ratio of the ________ ?

35 / 50

During filtration operation, the filtrate encounters the resistance of the _____?

36 / 50

Compressibility co-efficient for an absolutely compressible cake is________?

37 / 50

Angle of nip of the crushing rolls does not depend upon the________?

38 / 50

Dispersion of a gas through liquid is done by using a___________?

39 / 50

During the washing of cake__________?

40 / 50

As particle size is reduced___________?

41 / 50

Colloidal mills are used for _______ grinding?

42 / 50

Cartridge filters are termed as ?edge? filters, because of the fact that the__________?

43 / 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?

44 / 50

Energy consumption in a crusher decreases with increase in the__________?

45 / 50

During size reduction by a jaw crusher, the energy consumed decreases with the___________?

46 / 50

Basic slag is not ground in__________?

47 / 50

Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?

48 / 50

Carbon black is pulverised in a________?

49 / 50

Cumulative analysis for determining surface is more precise than differential analysis, because of the________?

50 / 50

Energy consumed for crushing one ton of material ranges from _______ kWh?

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