chemical engineering Mcqs
2601. During size reduction by a jaw crusher, the energy consumed decreases with the__________________?
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A. Decreasing machine capacity

B. None of these

C. Increasing size of feed at constant reduction ratio

D. Decreasing size of product at constant size of feed

2603. Which of the following screens has the maximum capacity ?
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A. Vibrating screen

B. Grizzlies

C. Shaking screen

D. Trommels

2604. Colloidal mills are used for ______________ grinding?
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A. Intermediate

B. Fine

C. Coarse

D. Ultrafine
2605. Variables affecting the rate of homogeneous reactions are___________________?
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A. Pressure and temperature only

B. Temperature and composition only

C. Pressure and composition only

D. Pressure, temperature and composition
2606. Dust laden air can be purified using a____________________?
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A. Bag filter

B. Gravity settler

C. Tubular centrifuge

D. Cyclone separator
2608. ______________ is used for producing a thick suspension from a thin slurry?
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A. Rotary drum vacuum filter

B. Plate and frame filter press

C. Pressure filter thickener

D. Cartridge filter

2612. Close circuit grinding by a ball mill with air sweeping employs a _______________________?
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A. Classifier

B. Cyclone separator between mill & classifier

C. Both A. & B.

D. Neither A. nor B.

2614. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the__________________?
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A. Venturi atomiser

B. Gravity settling chamber

C. Electro-static precipitator

D. Cyclone separator

2618. Which of the following mechanical conveyors does not come under the division scrapers? ?
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A. Drag conveyor

B. Ribbon conveyor

C. Bucket elevators

D. Flight conveyor

2619. Screen efficiency is______________________?
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A. Recovery

B. Recovery/rejection

C. None of these

D. Rejection

2620. Cyclones are used primarily for separating_________________?
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A. Solids from solids

B. Solids

C. Solids from fluids

D. Liquids

2623. Vertical transportation of materials can be done by a/an_______________?
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A. Apron conveyor

B. Pneumatic conveyor

C. Bucket elevator

D. Both B. & C.
2624. Moisture can be removed from lubricating oil using_________________?
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A. Clarifier

B. Sparkler filter

C. Tubular centrifuge

D. Vacuum leaf filter

2625. As the product becomes finer, the energy required for grinding___________________?
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A. Decreases

B. Is same as for coarser grinding

C. Is 1.5 times that for coarser grinding

D. Increases
2626. In a zero order reaction, reactants concentration does not change with time and the_________________?
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A. Time for half change is independent of the initial concentration

B. Reaction rate is trebled when the initial concentration is trebled

C. Time for completion of the reaction is independent of the initial concentration

D. Time for half change is half the time taken for completion of the reaction
2627. Which of the following must be stored in silos and not in open yard ?
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A. None of these

B. High V.M. bituminous coal

C. Coke breeze

D. Sand

2631. Filtration should be stopped in a filter press, if the_________________?
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A. Cake becomes very dense

B. Liquor stops flowing out to the discharge

C. Filtration pressure rises suddenly

D. Both B. & C.
2634. In case of a hammer crusher ?
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A. Reduction ratio can be varied by adjusting the distance from cage to hammers

B. All A., B. and C.

C. Maximum acceptable feed size is 30 cms

D. Crushing takes place by impact breaking

2636. Equivalent diameter of a particle is the diameter of the sphere having the same __________________?
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A. Ratio of surface to volume as the actual volume

B. Ratio of volume to surface as the particle

C. None of these

D. Volume as the particle

2637. The most common filter aid is_________________?
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A. Silica gel

B. Calcium silicate

C. Sodium carbonate

D. Diatomaceous earth
2639. An example of autothermal reactor operation is______________________?
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A. Sulphur dioxide oxidation

B. Benzene oxidation

C. Ethylene oxidation

D. Ammonia synthesis

2641. Which of the following is not a non-metalliferous mineral ?
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A. Quartz

B. Fluorspar

C. Calcite

D. Cassiterite
2642. The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?
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A. Grinding element & the housing

B. Feed particles

C. Both A. and B.

D. Neither A. nor B.

2643. Jigging is a technique by which different particles can be____________________?
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A. Separated by particle density

B. Separated by particle size

C. Separated by particle shape

D. Mixed

2646. Tabular bowl centrifuges as compared to disk bowl centrifuges___________________?
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A. Cant be used for separation of fine suspended solids from a liquid

B. Operate at higher speed

C. Employ bowl of larger diameter

D. Cant be operated under pressure/vacuum

2647. Which of the following is not used as a filter medium in case of corrosive liquids?
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A. Nylon

B. Glass cloth

C. Cotton fabric

D. Metal cloth of monel or stainless steel

2648. Diatomaceous earth is a/an_________________?
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A. Catalyst

B. Filter medium

C. Filter aid

D. Explosive

2649. The capacity of a pneumatic conveying system depends upon the ______________________?
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A. Bulk density of materials

B. All A., B. and C.

C. Pressure of the conveying air

D. Diameter of the conveying line