chemical engineering mechanical operations MCQs – Page 15

Practise multiple-choice questions from chemical engineering mechanical operations for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs
281. A _____________ mixer resembles a ball mill without balls?
comments icon0

A. Pug mill

B. Tumbling

C. Banbury

D. Pan

282. Which of the following minerals is not subjected to magnetic separation method ?
comments icon0

A. Siderite

B. Galena

C. Rutile

D. Chromite

283. Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________?
comments icon0

A. M ? D2

B. M ? ?D

C. M ? D3

D. M ? D

284. A belt conveyor used for the transportation of materials can___________________?
comments icon0

A. Run upto 1 km

B. Travel at a speed upto 300 metres/minute

C. Handle materials upto 5000 tons/hr

D. All A., B. and C.
285. Which of the following screens has the maximum capacity ?
comments icon0

A. Trommels

B. Shaking screen

C. Grizzlies

D. Vibrating screen
286. Filtration should be stopped in a filter press, if the_________________?
comments icon0

A. Cake becomes very dense

B. Liquor stops flowing out to the discharge

C. Filtration pressure rises suddenly

D. Both B. & C.
287. Choke crushing (in case of a Jaw crusher) compared to free crushing__________________?
comments icon0

A. Results in increased capacity

B. Consumes less power

C. Consumes more power

D. Both A. and C.

288. Stamp mills are generally used for crushing__________________?
comments icon0
A. Gold ores

B. Diamond

C. Talc

D. Iron ores

289. Rod mills employed for grinding_________________?
comments icon0

A. Is useful for handling sticky materials

B. Employ a steel shell having L/D ratio of 1.5 to 3.0

C. Employ steel rods of 2-12 cms diameter extending over full length of the mill

D. All A , B & C
290. In a roll crusher, the specific power consumption and the production rate is affected by the_________________?
comments icon0

A. Reduction ratio

B. Differential roll speed

C. Both A. and B.

D. Neither A. nor B.

291. Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?
comments icon0

A. Tube mill

B. Jet pulveriser

C. Jaw crusher

D. Ball mill

292. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a ______________ conveyor?
comments icon0

A. Flight

B. Ribbon

C. Screw

D. Slat or drag

293. A _____________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end?
comments icon0

A. Tube

B. Pebble

C. Rod

D. Compartment
294. Pick out the correct statement?
comments icon0

A. The capacity and the effectiveness of a screen are the same

B. The capacity and the effectiveness of screen are opposing factors

C. The screening surface of a reel (a revolving screen used in flour mills) is made of silk bolting

D. th supported by wire mesh

E. Both B. and C.
295. To produce talcum powder, use_____________________?
comments icon0
A. Ball mill

B. Jet mill

C. Hammer mill

D. Pin mill

296. The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?
comments icon0

A. Grinding element & the housing

B. Feed particles

C. Both A. and B.

D. Neither A. nor B.

297. Additives used for promoting the flocculation of particles is a/an _____________________?
comments icon0

A. Electrolyte

B. Surface active agent

C. Both A. & B.

D. Neither A. nor B.

298. Ultrafine grinders operate principally by_________________?
comments icon0

A. Impact

B. Slow compression

C. Attrition

D. Cutting action

299. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?
comments icon0

A. Concrete

B. Flint or porcelain

C. Stainless steel

D. Bronze

300. Dust laden air can be purified using a____________________?
comments icon0

A. Gravity settler

B. Bag filter

C. Tubular centrifuge

D. Cyclone separator