chemical engineering MCQs – Page 136

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 Review each marked answer and report any item that may be outdated or unclear.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
2701. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them ?
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A. Fluid energy mill, Jaw crusher, Ball mill

B. Jaw crusher, Ball mill, Fluid energy mill

C. Fluid energy mill, Ball mill, Jaw crusher

D. Ball mill, Jaw crusher, Fluid energy mill

2702. Sulphuric acid mist is arrested by using a ____________ scrubber?
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A. Venturi

B. Packed wet

C. Co-current

D. Hollow wet

2703. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
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A. 2.76

B. 1

C. 0.5

D. 0.66
2704. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is_____________________?
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A. 0.01 to 0.1

B. 0.2 to 0.8

C. 0.2 to 0.4

D. 0.1 to 0.3

2705. _____________ is the most commonly used filter aid?
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A. Semi-plastic clay

B. Vermiculite

C. Fullers earth

D. Diatomaceous earth
2706. A belt conveyor used for the transportation of materials can___________________?
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A. All A., B. and C.

B. Travel at a speed upto 300 metres/minute

C. Handle materials upto 5000 tons/hr

D. Run upto 1 km

2707. The basic filtration equation is given as dt/dV = (?/A ?P). [(? .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, ? is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
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A. 25

B. 20

C. 30

D. 10

2708. _____________ are mixed using ribbon blenders ?
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A. Dry powders

B. Thick pastes

C. Lumpy solids and low viscosity liquids

D. High viscosity liquids

2709. Which of the following is not categorised as a mechanical operation?
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A. Humidification

B. Size enlargement

C. Agitation

D. Filtration

2710. Mixing of light fine powder such as insecticides is done by____________________?
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A. Banbury mixer

B. Pug mill

C. Impact wheels

D. Kneader

2711. Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?
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A. Langmuirs assumption applies to every adsorbed layer

B. There is no dynamic equilibrium between successive layer

C. cept the first one) is involved in each of the evaporation process

D. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer

E. None of these

2712. Size reduction does not occur due to compression in case of________________?
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A. Jaw crushers

B. Gyratory crushers

C. Rod mills

D. Smooth roll crushers

2713. Which of the following is not a cutting machine ?
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A. Slitters

B. Dicers

C. Knife cutters

D. Tube mills
2714. With increase in drum speed, in a rotary drum filter, the filtration rate_______________?
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A. Decreases

B. Increases linearly

C. Is not affected

D. Increases
2715. Wet sieving is employed, when the product contains ________________ materials?
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A. Non-sticky

B. Coarse

C. Abrasive

D. Large quantity of very fine
2716. The maximum slope of a belt conveyor can be_____________________?
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A. 60

B. 15

C. 45

D. 30
2717. In a roll crusher, the specific power consumption and the production rate is affected by the_________________?
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A. Reduction ratio

B. Differential roll speed

C. Both A. and B.

D. Neither A. nor B.

2718. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bonds law, Rittingers law and Kicks law) depend upon the_________________?
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A. Feed material

B. Type of crushing machine

C. Both A. & B.

D. Neither A. nor B.

2719. The speed of a rotary drum vacuum filter may be about _____________ rpm?
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A. 1

B. 500

C. 100

D. 50

2720. For benefication of iron ore, the most commonly used method is______________?
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A. None of these

B. Flocculation

C. Froth floatation

D. Jigging & tabling