Mechanical Operations Objective Questions and Answers

211. Wet seiving is employed, when the product contains __________ materials.

212. During size reduction by a jaw crusher, the energy consumed decreases with the

A. Decreasing size of product at constant size of feed

C. Increasing size of feed at constant reduction ratio

213. 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?

214. __________ centrifuge is normally used in sugar mills.

A. Tubular bowl

B. Disc-bowl

C. Suspended batch basket

D. Perforated horizontal basket continuous

Discussion

215. Vertical transportation of materials can be done by a/an

A. Apron conveyor

B. Pneumatic conveyor

C. Bucket elevator

D. Both B & C

Discussion

216. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

217. With increase in drum speed, in a rotary drum filter, the filtration rate

A. Increases

B. Increases linearly

C. Decreases

D. Is not affected

Discussion

Chemical Engineering Objective Questions { Mechanical Operations }