chemical engineering mechanical operations MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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

161. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?
0

A. Ribbon

B. Slat

C. Screw

D. Drag

162. Gyratory crushers compared to the reciprocating jaw crushers__________________?
0

A. Have less steady power consumption

B. Have greater capacity per unit of discharge area

C. Crush intermittently

D. Are less suitable for coarse materials

163. Bucket elevators are not suitable for the vertical lifting of __________ materials?
0

A. Fine (e.g. 200 mesh size coal)

B. Small lumpy (e.g. grains and sand)

C. Free flowing

D. Sticky (e.g. clay paste)

164. Gravity stamp mill is meant for the ___________________ crushing?
0

A. Primary

B. Fine

C. Ultrafine

D. Intermediate

165. The filtrate flow rate in constant pressure filtration___________________?
0

A. Remain constant throughout

B. Continuously increases

C. Continuously decreases

D. May increase or decrease; depends on the pressure

166. Which of the following is not a part of the Blake jaw crusher ?
0

A. Hanger

B. Check plates

C. Pitman

D. Toggles

167. Pine oil and Cresylic acid are used as ______________ in the froth floatation process?
0

A. Conditioner

B. Depressor

C. Frother

D. Collector

168. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________?
0

A. Remains constant

B. Decreases

C. Increases

D. Increases linearly

169. The term angle of nip is concerned with the operation of the ____________ crushers?
0

A. Gyratory

B. Jaw

C. None of these

D. Roll

170. The specific cake resistance for incompressible sludges is (where ?P = pressure drop over cake)__________________?
0

A. Independent of ?P

B. ? ??P

C. ? 1/ ?P

D. ? ?P

171. The most common filter aid is_________________?
0

A. Silica gel

B. Sodium carbonate

C. Diatomaceous earth

D. Calcium silicate

172. Screw conveyors are________________?
0

A. Run at very high rpm

B. Suitable for sticky materials

C. All A., B. and C.

D. Suitable for highly abrasive materials

173. Use of grinding aids results in the ___________________?
0

A. Enhanced production rate

B. Finer products

C. Both A. & B.

D. Neither A. nor B.

174. Carbon black is pulverised in a_______________?
0

A. Gyratory crusher

B. Ball mill

C. Roll crusher

D. Hammer crusher

175. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?
0

A. At time zero

B. At the end of filtration

C. When half the filtrate has been obtained

D. At the end of filtration, but decreases with time subsequently

176. What is the reduction ratio in a fine crushing operation having following feed and product sizes ?
0

A. 2

B. 5

C. 10

D. 0.5

177. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?
0

A. Plane

B. Either A. or B.

C. Curved

D. Ribbed

178. Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?
0

A. None of these

B. Wettability

C. Particle shape

D. Gravity separation

179. Gold ore concentration is mostly done using___________________?
0

A. Jigging

B. Elutriation

C. Froth floatation

D. Tabling

180. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?
0

A. Tailing

B. Middling

C. None of these

D. Concentrate

Previous Next

Showing 161 to 180 of 445 mcqs