Mechanical Operations - Practice Test

[#376] Tabular bowl centrifuges as compared to disk bowl centrifuges

(A) Operate at higher speed

(B) Employ bowl of larger diameter

(C) Can't be operated under pressure/vacuum

(D) Can't be used for separation of fine suspended solids from a liquid

Correct Answer

(A) Operate at higher speed

[#377] Which of the following is not a part of the Blake jaw crusher?

(A) Hanger

(B) Check plates

(C) Toggles

(D) Pitman

Correct Answer

(A) Hanger

[#378] Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

(A) Sand bed filter

(B) Plate and frame filter press

(C) Vacuum filter

(D) Batch basket centrifuge

(E) Sand bed filter

(F) Plate and frame filter press

(G) Vacuum filter

(H) Batch basket centrifuge

Correct Answer

(C) Vacuum filter
(G) Vacuum filter

[#379] Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

(A) Wet grinding in low viscous suspension

(B) Wet grinding in high viscous suspension

(C) Dry grinding of large particles (upto 1.25 cms)

(D) Dry grindng of large particles in un-baffed mills

Correct Answer

(D) Dry grindng of large particles in un-baffed mills

[#380] The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

(A) Boundary mixer

(B) Propeller agitator

(C) Sharpies centrifuge

(D) None of these

Correct Answer

(A) Boundary mixer

Mechanical Operations - Study Mode

[#376] Tabular bowl centrifuges as compared to disk bowl centrifuges

Correct Answer

[#377] Which of the following is not a part of the Blake jaw crusher?

Correct Answer

[#378] Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

Correct Answer

[#379] Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Correct Answer

[#380] The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

Correct Answer