chemical engineering MCQs – Page 126

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
2501. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the ______________ filter?
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A. Plate & frame

B. Sand

C. Shell & leaf

D. Rotary vacuum

2502. Screw conveyors are________________?
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A. Suitable for sticky materials

B. All A., B. and C.

C. Run at very high rpm

D. Suitable for highly abrasive materials

2503. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?
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A. 0.007

B. 0.30

C. 0.014

D. 50

2504. Sedimentation on commercial scale occurs in____________________?
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A. Cyclones

B. Thickeners

C. Rotary drum filters

D. Classifiers

2505. ____________ mills fall in the category of tumbling mills ?
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A. Ball and pebble

B. Compartment

C. Rod and tube

D. All A., B. & C.
2506. For crushing of solids, the Rittingers law states that the work required for crushing is proportional to __________________?
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A. The size reduction ratio

B. None of these

C. The change in volume due to crushing

D. The new surface created
2507. Which of the following conveyors cannot be recommended for transportation of abrasive materials ?
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A. Apron conveyor

B. Flight conveyor

C. Belt conveyor

D. Chain conveyor

2508. The porosity of a compressible cake is _____________________?
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A. Minimum at the filter medium

B. Maximum at the filter medium

C. Same throughout the thickness of cake

D. Minimum at the upstream face

2509. Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?
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A. Asbestos & mica

B. Non-metallic ores

C. Metalliferous ores

D. Basic slags

2510. Which of the following relationships between co-efficient of friction (?) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
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A. ? > tan 2?

B. ? ? tan ?

C. ? ? tan ?

D. ? > tan ?

2511. A pebble mill_________________?
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A. Is a ball mill

B. Employs flints or ceramic pebbles as the grinding medium

C. Is a tube mill lined with ceramic or other non-metallic liner

D. Both B. and C.
2512. Traces of liquid tar fog present in coke oven gas is separated using____________________?
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A. Strainer

B. Electrostatic precipitator

C. Cyclone separator

D. None of these

2513. For spheres, volume shape factor is given by____________________?
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A. AD/V

B. ? = (A/D2)

C. ?/6 = (V/D3)

D. 2? = (2A/D2)

2514. 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 ?
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A. Wet grinding in high viscous suspension

B. Dry grinding of large particles in un-baffed mills

C. Wet grinding in low viscous suspension

D. Dry grinding of large particles (upto 1.25 cms)

2515. On application of pressure to the equilibrium system, ice ? water; which of the following phenomenon will occur ?
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A. Water will evaporate

B. More water will be formed

C. More ice will be formed

D. Equilibrium will not be attained

2516. A compressible cake has the_________________?
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A. None of these

B. Maximum porosity at the filter medium

C. Same porosity throughout the cake thickness

D. Maximum porosity at the upstream side
2517. Gelatinous solid (which plug the septum) can be filtered by a _____________ filter?
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A. Sparkler

B. Vacuum leaf

C. Plate and frame

D. Pre-coat
2518. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the _____________ of the belt?
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A. Length

B. Thickness

C. Speed

D. None of these

2519. _____________ conveyors are also called scrapers?
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A. Apron

B. Screw

C. Helical flight

D. Both B. & C.
2520. Grizzlies are used for separating _____________ solids?
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A. Coarse

B. None of these

C. Fine

D. Any size