Mechanical Operations - Study Mode

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[#201] Wet seiving is employed, when the product contains __________ materials.

(A) Abrasive

(B) Large quantity of very fine

(C) Coarse

(D) Non-sticky

Correct Answer

(B) Large quantity of very fine

[#202] Pick out the correct statement.

Correct Answer

(B) Kick's crushing law is, $$frac{{ ext{P}}}{{ ext{m}}} = { ext{K}}.ln left( {frac{{{{overline { ext{D}} }_{{ ext{sa}}}}}}{{{{overline { ext{D}} }_{{ ext{sb}}}}}}} ight)$$
(H) Both B and C
(J) A hopper is a small bin with a sloping bottom

[#203] During filtration operation, the filtrate encounters the resistance of the

(A) Filter medium

(B) Cake

(C) Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium

(D) All of the above

Correct Answer

(D) All of the above

[#204] Optimum ratio of operating speed to critical speed of a trommel is

(A) 0.33-0.45

(B) 1.33-1.45

(C) 0.5-2

(D) 1.5-2.5

Correct Answer

(A) 0.33-0.45

[#205] Energy requirement (per unit mass of material crushed/ground) is highest for

(A) Jaw crusher

(B) Rod mill

(C) Ball mill

(D) Fluid energy mill

Correct Answer

(D) Fluid energy mill