Mechanical Operations Mcqs for Chemical

Q.  Helical screw agitator is used for________________?

a. Mixing highly viscous pastes
b. Blending immiscible liquids
c. Mixing liquids at very high temperature (> 250 °C)
d. None of these


ANSWER: See Answer
 
No explanation is available for this question!
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MCQs:  The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
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MCQs:  A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ___________________?
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MCQs:  Equivalent diameter of a particle is the diameter of the sphere having the same __________________?
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MCQs:  _____________ is the most commonly used ‘filter aid’?
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MCQs:  For the preliminary breaking of hard rock, we use a____________________?
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MCQs:  Jigging is a technique by which different particles can be____________________?
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MCQs:  The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
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MCQs:  What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
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MCQs:  According to Taggart’s 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_______________?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  Wet sieving is employed, when the product contains ________________ materials?
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MCQs:  Size reduction mechanism used in Jaw crushers is__________________?
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MCQs:  Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?
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MCQs:  The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?
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MCQs:  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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MCQs:  During size reduction by a jaw crusher, the energy consumed decreases with the__________________?
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MCQs:  Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?
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MCQs:  The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3)_________________?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts