chemical engineering MCQs – Page 135

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 Review each marked answer and report any item that may be outdated or unclear.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

2681. Which of the following is not a revolving/tumbling mill used for size reduction ?
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A. Compartment mill

B. Rod mill

C. Cage mill

D. Pebble mill

2682. The half life period t of a zero order reaction as shown in the bellow figure, is equal to_________________?
0

A. CA0/K

B. 1/K

C. CA0/2K

D. 0.693/K

2683. A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?
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A. Of different sizes

B. Equal in size

C. Of such size that the ratio of their volumes is < 5

D. None of these

2684. In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?
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A. Laminar

B. None of these

C. Turbulent

D. Plug

2685. If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion?
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A. Pore

B. None of these

C. Film

D. Ash layer

2686. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is__________________?
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A. 4

B. 2-Jan

C. 1

D. 1/4

2687. What is the selectivity index, if the grade of tailings & concentrate is the same ?
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A. 0

B. 1

C. ?

D. 0.5

2688. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size)?
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A. s/c

B. c/s

C. s . c

D. 1/s . c

2689. Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an________________?
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A. Venturi scrubber

B. Bag filter

C. Air filter

D. Hydrocyclones

2690. Which of the following comes in the category of primary crusher for hard and tough stone ?
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A. None of these

B. Gyratory crusher

C. Cone crusher

D. Jaw crusher

2691. Semibatch reactor is preferred, when a/an__________________?
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A. A gas is to be reacted with liquid (e.g. hydrogenation of fat)

B. A highly exothermic reaction is to be controlled

C. Undesirable side reaction (at high concentration of one of the reactants) is to be avoided

D. All A., B., and C.

2692. To produce talcum powder, use_____________________?
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A. Pin mill

B. Hammer mill

C. Jet mill

D. Ball mill

2693. Cake resistance is___________________?
0

A. None of these

B. Important in the beginning of filtration

C. Decreased with the time of filtration

D. Independent of pressure drop

2694. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
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A. Exponential curve

B. Straight line

C. Hyperbola

D. Parabola

2695. Which of the following is not an industrial screening equipment ?
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A. Vibrating screen

B. Grizzly

C. Sharpies centrifuge

D. Trommel

2696. Mixing of plastic solids is generally facilitated by___________________?
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A. Kneading

B. Dispersion

C. None of these

D. Mastication

2697. 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. 18 kWh/ton

B. 9.0 kWh/ton

C. 25.4 kWh/ton

D. 6.35 kWh/ton

2698. Shape factor for a cylinder whose length equals its diameter is_________________?
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A. 0.5

B. 1.5

C. 1

D. 2

2699. Which of the following is the most suitable for handling fibrous and dense slurries ?
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A. Turbine agitator

B. Cone type agitator

C. Radial propeller agitator

D. Propeller agitator

2700. Ficks law relates to_________________?
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A. Final particle size

B. None of these

C. Feed size

D. Energy consumption

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