Chemical Engineering MCQs

6108 MCQs  (Page 222 of 611)

Attempt Chemical Engineering Quiz
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?
A. 0.5 d
B. D
C. 1.5 d
D. 2 d
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Angle of nip of the crushing rolls does not depend upon the_______________?
A. Diameter of the rolls
B. Speed of the rolls
C. Product size
D. Feed size
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Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
A. Compartment mill
B. Rod mill
C. Pebble mill
D. Tube mill
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Flow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?
A. Kozeny-carman
B. Hagen-posieuille’s
C. Fanning’s
D. Kremser
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Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?
A. √μ
B. 1/√μ
C. 1/μ
D. 1/μ2
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Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?
A. Propeller
B. Helical screw
C. Flat blade turbine
D. Curved blade turbine
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The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?
A. D2
B. Dp
C. 1/dp
D. 1/d2p
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Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?
A. Sorting
B. Sizing
C. Flocculation
D. Elutriation
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Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?
A. 200°c and 5 atm
B. 1000°c and 10 atm
C. 500°c and 50 atm
D. 1000°c and 500 atm
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Energy consumed for crushing one ton of material ranges from ______________ kWh?
A. 0.01 to 0.1
B. 0.5 to 1.5
C. 2 to 3.5
D. 4 to 5
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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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