Chemical Engineering MCQs

6108 MCQs  (Page 223 of 611)

Attempt Chemical Engineering Quiz
Sphericity of raschig ring (whose length and diameter are equal) is___________________?
A. > 1
B. < 1
C. 1
D. 2
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Which of the following gives the crushing energy required to create new surface ?
A. Taggarts rule
B. Fick’s law
C. Rittinger’s law
D. None of these
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The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?
A. Vacuum
B. Sand
C. Plate & frame
D. Rotary
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Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?
A. British standard screens
B. German standard screens (din 1171) etc
C. American standard screens (astm and tyler standard screens)
D. All a., b. and c.
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In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?
A. Secondary
B. Fine
C. Primary
D. Ultrafine
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_______________ centrifuge is the most suitable for separation of non-friable crystals?
A. Tubular bowl
B. Disc-bowl
C. Perforated horizontal basket continuous
D. Suspended batch basket
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Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?
A. > 10
B. < 10
C. > 100
D. < 100
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A _______________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?
A. Thickener
B. Classifier
C. Strainer
D. Clarifier
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At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?
A. Po ∝ re-1.0
B. Po ∝ re0.0
C. Po ∝ re0.5
D. Po ∝ re1.0
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The critical speed of a trommel (N) is related to its dia D. as _____________________?
A. N ∝ 1/√d
B. N ∝ √d
C. N ∝ d
D. N ∝ 1/d
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Word of the Day
27 Jul
Widen
make or become wider.
چوڑا ہونا، کشادہ کرنے کا عمل

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