Mechanical Operations - Study Mode

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[#236] Balls for ball mills are never made of

(A) Forged/cast steel

(B) Lead

(C) Cast iron

(D) Alloy steel

Correct Answer

(B) Lead

[#237] Which of the following may prove unsuitable for filtering volatile liquids?

(A) Pressure filter

(B) Gravity filter

(C) Centrifugal filter

(D) Vacuum filter

Correct Answer

(D) Vacuum filter

[#238] Cement clinker is reduced to fine size by a

(A) Roll crusher

(B) Ball mill

(C) Tube mill

(D) Hammer mill

Correct Answer

(C) Tube mill

[#239] The speed of a rotary drum vacuum filter may be about __________ rpm.

(A) 1

(B) 50

(C) 100

(D) 500

Correct Answer

(A) 1

[#240] The crushed material received for separation is called feed or

(A) Tailing

(B) Heading

(C) Concentrate

(D) Middling

Correct Answer

(B) Heading