Mechanical Operations - Study Mode

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[#351] Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.

(A) Blake jaw

(B) Toothed roll

(C) Gyratory

(D) None of these

Correct Answer

(B) Toothed roll

[#352] Which of the following conveyors cannot be recommended for transportation of abrasive materials?

(A) Belt conveyor

(B) Apron conveyor

(C) Flight conveyor

(D) Chain conveyor

Correct Answer

(C) Flight conveyor

[#353] Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

(A) Resins

(B) Gums

(C) Hard rubber

(D) Waxes

Correct Answer

(C) Hard rubber

[#354] 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)

(A) LS

(B) 93 LS

(C) 250 LS

(D) $$sqrt {{ ext{LS}}} $$

Correct Answer

(B) 93 LS

[#355] 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?

(A) Cresylic acid

(B) Copper sulphate

(C) Calcium carbonate

(D) Sodium carbonate

Correct Answer

(B) Copper sulphate