chemical engineering mechanical operations MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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
401. Which of the following is not a non-metalliferous mineral ?
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A. Fluorspar

B. Quartz

C. Calcite

D. Cassiterite
402. 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. Jaw crusher, Ball mill, Fluid energy mill

B. Fluid energy mill, Ball mill, Jaw crusher

C. Fluid energy mill, Jaw crusher, Ball mill

D. Ball mill, Jaw crusher, Fluid energy mill

403. Trommels employ _____________ for screening of materials?
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A. Punched plate

B. None of these

C. Fibrous cloth

D. Woven wire screen

404. Which of the following is the softest material ?
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A. Calcite

B. Talc

C. Feldspar

D. Corundum

405. Pick out the wrong statement ?
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A. Cake resistance is independent of the pressure drop

B. Gyratory crusher is a coarse crusher

C. Crushing of explosive materials are done by employing dry-grinding

D. stant

E. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be

406. In the cyclone separator used for separation of dust from dust laden gas, the gas ?
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A. Enters the cyclone from the top

B. Is admitted tangentially at high velocity

C. Develops a helical motion inside the chamber

D. Both B. and C.
407. The material is crushed in a gyratory crusher by the action of__________________?
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A. Cutting

B. Compression

C. Impact

D. Attrition

408. Fluid medium used in the classification technique of mineral beneficiation is_________________?
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A. Air

B. Neither A. nor B.

C. Water

D. Either A. or B.
409. Grindability of a material does not depend upon its_____________________?
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A. Size

B. Hardness

C. Elasticity

D. Toughness

410. _____________ are mixed using ribbon blenders ?
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A. Lumpy solids and low viscosity liquids

B. Thick pastes

C. High viscosity liquids

D. Dry powders
411. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
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A. Exponential curve

B. Hyperbola

C. Parabola

D. Straight line

412. Filter medium resistance is important during the ______________ of filtration?
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A. Early stages

B. Final stages

C. Entire process

D. None of these

413. Fibrous material is broken by a__________________?
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A. Roll-crusher

B. Ball mill

C. Tube mill

D. Squirrel-cage disintegrator
414. The maximum slope of a belt conveyor can be_____________________?
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A. 15

B. 45

C. 60

D. 30
415. Xanthates are used in the froth floatation process as a/an _______________________?
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A. Frother

B. Collector

C. Activator

D. Conditioner

416. The work index in Bonds law for crushing of solids has the following dimensions__________________?
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A. kW/ton

B. kWh/ton

C. No units (dimensionless)

D. kWh.m1/2/ton

417. Pick out the wrong statement ?
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A. Magnetic separation method can be employed to treat both dry & wet ores

B. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the

C. imum product size</strong>

D. Gyratory crusher is used for coarse crushing

E. Screens are of stationary, moving and vibratory types

418. Crushing of mineral particles is accomplished in a cage mill, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
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A. Vibratory

B. Impact

C. None of these

D. Roll

419. According to Taggarts rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?
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A. 0.184

B. 1.84

C. 0.0184

D. 0.00184

420. The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bonds law) of the energy to grind the particles from a very large size to 50 ?m is________________?
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A. 6.35 kWh/ton

B. 25.4 kWh/ton

C. 18 kWh/ton

D. 9.0 kWh/ton