chemical engineering MCQs – Page 137

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 Review each marked answer and report any item that may be outdated or unclear.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
2721. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
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A. None of these

B. Rittingers law

C. Bonds law

D. Kicks law

2722. The grinding in a hammer crusher takes place due to the_______________?
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A. Attrition

B. Impact

C. Both A. & B.

D. Neither A. nor B.

2723. A photochemical reaction is _______________ light?
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A. Used to convert heat energy into

B. Initiated by

C. Catalysed by

D. Accompanied with emission of

2724. The inlet pressure in a constant rate filtration____________________?
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A. Increases continuously

B. Remains constant

C. Decreases gradually

D. None of these

2725. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________?
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A. Electromagnets

B. Unbalanced flywheels

C. Cams or eccentric shafts

D. Either A., B. or C.
2726. Filter aid is used to____________________?
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A. Decrease the pressure drop

B. Act as a support base for the septum

C. Increase the rate of filtration

D. Increase the porosity of the cake
2727. Sauter mean diameter is the same as the ______________ mean diameter?
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A. Geometric

B. Mass

C. Arithmetic

D. Volume-surface
2728. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant ______________ filtration?
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A. Rate

B. Pressure

C. Both A. & B.

D. Neither A. nor B.

2729. For separation of sugar solution from settled out mud, we use a ___________________ filter?
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A. Centrifugal

B. Sparkler

C. Rotary drum vacuum

D. Plate and frame

2730. 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__________________?
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A. Bronze

B. Concrete

C. Stainless steel

D. Flint or porcelain
2731. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a ______________ conveyor?
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A. Screw

B. Slat or drag

C. Ribbon

D. Flight

2732. Production rate _____________ with increased fineness, with a given energy input to the size reduction machine?
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A. Increases

B. May increase or decrease; depends on the machine

C. Remains unchanged

D. Decreases
2733. For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?
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A. 10

B. 25

C. 50

D. 75

2734. Size reduction of _____________ is accomplished in steam heated rollers and roll crushers?
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A. Hard rubber

B. Waxes

C. Resins

D. Gums

2735. Which of the following is not accomplished by agitation of liquids in agitators ?
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A. Dispersing immiscible liquid in form of emulsion

B. Dispersing gas in liquid

C. Suspending solid particles

D. Blending of immiscible liquids
2736. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
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A. Baum jig washer

B. Trough washer

C. Froth floatation

D. Spiral separator

2737. Reduction ratio of crushers is the___________________?
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A. None of these

B. Ratio of discharge opening to feed opening

C. Ratio of feed opening to discharge opening

D. Determining factor for minimum dia of the feed and the product

2738. The main size reduction operation in ultrafine grinders is_____________?
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A. Impact

B. Attrition

C. Cutting

D. Compression

2739. Ultra centrifuges are used for the separation of _____________ solid particles?
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A. Coarse

B. Dissolved

C. Colloidal

D. Fine

2740. In closed circuit grinding as compared to open circuit grinding, the_________________?
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A. Specific surface of product is more

B. Operation is economical

C. Product has lesser size uniformity

D. Production rate at a given limiting size is lower