Description : Maximum size reduction in a ball mill is done by the, __________ action. (A) Attrition (B) Compression (C) Impact (D) Cutting
Last Answer : (C) Impact
Description : The main size reduction operation in ultrafine grinders is (A) Cutting (B) Attrition (C) Compression (D) Impact
Last Answer : (B) Attrition
Description : Colloid mills achieve size reduction mainly by (A) Impact (B) Attrition (C) Cutting (D) Compression
Description : General mechanism of size reduction in intermediate and fine grinder is by (A) Cutting action (B) Compression (C) Compression and tearing (D) Impact and attrition
Last Answer : (D) Impact and attrition
Description : Pick out the wrong statement. (A) More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one (B) There are only four methods namely compression, impact ... Operating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers
Last Answer : (C) Cutting machines mainly employ 'attrition' for size reduction of solids
Description : For coarse reduction of hard solids, use (A) Impact (B) Attrition (C) Compression (D) Cutting
Last Answer : (C) Compression
Description : Which of the following size reduction equipments employs mainly attrition for ultrafine grinding? (A) Jet mills (B) Fluid energy mill (C) Micronizer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : The mechanism of size reduction by a hammer mill is by impact and attrition between the (A) Grinding element & the housing (B) Feed particles (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : Toothed roll crushers achieve size reduction by (A) Tearing (shear) and compression (B) Impact and attrition (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : The material is crushed in a gyratory crusher by the action of (A) Impact (B) Compression (C) Attrition (D) Cutting
Last Answer : (B) Compression
Description : Ultrafine grinders operate principally by (A) Slow compression (B) Impact (C) Attrition (D) Cutting action
Last Answer : (C) Attrition
Description : Size reduction mechanism used in Jaw crushers is (A) Attrition (B) Compression
Description : Soft & non-abrasive materials can be made into fines by (A) Attrition (B) Compression (C) Cutting (D) None of these
Last Answer : (A) Attrition
Description : Explain the working, advantages and disadvantages of any one mill based on the principle of combined impact and attrition?
Last Answer : which of the following mill works on the principle of combined impact and attrition
Description : Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them. (A) Jaw crusher, Ball mill, Fluid energy mill (B) Ball mill, Jaw crusher, Fluid ... C) Fluid energy mill, Jaw crusher, Ball mill (D) Fluid energy mill, Ball mill, Jaw crusher
Last Answer : (A) Jaw crusher, Ball mill, Fluid energy mill
Description : A fluid energy mill is used for (A) Cutting (B) Grinding (C) Ultra-grinding (D) Crushing
Last Answer : (C) Ultra-grinding
Description : A fluid energy mill is used for (A) Cutting (B) Grinding (C) Ultra grinding (D) Crushing
Last Answer : (C) Ultra grinding
Description : Wheat is ground into flour in a (A) Hammer crusher (B) Roller crusher (C) Impact mill (D) Fluid energy mill
Last Answer : (B) Roller crusher
Description : __________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products. (A) Buhrstone (B) Roller (C) Attrition (D) Pebble
Last Answer : (D) Pebble
Description : Ball mill is used for (A) Crushing (B) Coarse grinding (C) Fine grinding (D) Attrition
Last Answer : (C) Fine grinding
Description : Out of the following size reduction equipments, the maximum feed size can be accepted by the (A) Tube mill (B) Ball mill (C) Jaw crusher (D) Jet pulveriser
Last Answer : (C) Jaw crusher
Description : A patient has improperly formed DEJ, reduction in size of pulp chamber, chipping and attrition of enamel that would MOSTLY be: A. Fluorosis B. Amelogenesis imperfecta C. Dentinogenesis imperfecta
Last Answer : C. Dentinogenesis imperfecta
Description : Alloy powder manufactured by the following process have spherical shapes. (A) Electrochemical deposition (B) Gaseous reduction (C) Atomisation (D) Mechanical attrition
Last Answer : (C) Atomisation
Description : Feed size of ≥ 25 cms can be accepted by (A) Ball mill (B) Rod mill (C) Fluid energy mill (D) Jaw crusher
Last Answer : (D) Jaw crusher
Description : The grinding in a hammer crusher takes place due to the (A) Attrition (B) Impact (C) Both (A) & (B) (D) Neither (A) nor (B
Description : In case of a hammer crusher, (A) Crushing takes place by impact breaking (B) Maximum acceptable feed size is 30 cms (C) Reduction ratio can be varied by adjusting the distance from cage to hammers (D) All (A), (B) and (C)
Description : Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately? (A) Rittinger's law (B) Kick's law (C) Bond's law (D) None of these
Last Answer : (A) Rittinger's law
Description : A tube mill as compared to a ball mill (A) Employs smaller balls (B) Gives finer size reduction but consumes more power (C) Has larger length/diameter ratio (>2 as compared to 1 for ball mill) (D) All (A), (B) and (C)
Description : For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a (A) Buhrstone mill (B) Ball mill (C) Crushing rolls (D) Hammer mill
Last Answer : (A) Buhrstone mill
Description : Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the (A) Blake jaw crusher (B) Cage mill (C) Stamp mill (D) Bradford's breaker
Last Answer : (B) Cage mill
Description : Which of the following is not a revolving/tumbling mill used for size reduction? (A) Compartment mill (B) Pebble mill (C) Cage mill (D) Rod mill
Last Answer : (C) Cage mill
Description : Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill. (A) Cage (B) Hammer (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : The weakest interparticle forces are present in :
Last Answer : The weakest interparticle forces are present in : A. thermosetting polymers B. themoplastic polymers C. fibres D. elastomers
Description : Los Angeles testing machine is used to conduct (A) Abrasion test (B) Impact test (C) Attrition test (D) Crushing strength test
Last Answer : Answer: Option A
Description : The clearance volume of the air compressor is kept minimum because A. It allows maximum compression to be achieved B. It greatly affects volumetric efficiency C. It results in minimum work D. It permits isothermal compression
Last Answer : ANSWER : B
Description : Size reduction does not occur due to compression in case of (A) Rod mills (B) Gyratory crushers (C) Jaw crushers (D) Smooth roll crushers
Last Answer : (A) Rod mills
Description : Which of the following terminology is not used for size reduction of materials to fine sizes or powders? (A) Comminution (B) Dispersion (C) Pulverisation (D) Compression
Last Answer : (D) Compression
Description : Which of the following is not an ultrafine grinder (colloid mill)? (A) Micronizers (B) Agitated mills and fluid energy mills (C) Toothed roll crusher (D) Hammer mills with internal classification
Last Answer : (C) Toothed roll crusher
Description : Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher? (A) Rod mill (B) Fluid energy mill (C) Gyratory crusher (D) Ball mill
Last Answer : (C) Gyratory crusher
Description : Energy requirement (per unit mass of material crushed/ground) is highest for (A) Jaw crusher (B) Rod mill (C) Ball mill (D) Fluid energy mil
Last Answer : (D) Fluid energy mil
Description : To get ultrafine particles, the equipment used is a (A) Ball mill (B) Rod mill (C) Hammer crusher (D) Fluid energy mill
Last Answer : (D) Fluid energy mill
Description : Fluid energy mill comes in the category of (A) Grinder (B) Crusher (C) Cutter (D) Ultrafine grinder
Last Answer : (D) Ultrafine grinder
Description : Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by (A) Keeping the heat transfer surface clean (B) Enhancing the fluid pumping rate (C) Increasing the tube length (D) None of these
Last Answer : (A) Keeping the heat transfer surface clean
Description : Highest cutting speed is achieved by the __________ tool material. (A) High speed steel (B) Carbide (C) Cast alloy (D) Plain carbon steel
Last Answer : (B) Carbide
Description : Processing of a data file to reduce its size for storage on disk is termed : (1) Amplification (2) Reduction (3) Compression (4) Rarefaction
Last Answer : Compression
Description : __________ balls capable of grinding the feed in a ball mill gives the maximum efficiency. (A) Cast iron (B) Minimum size (C) Maximum size (D) Elliptical
Last Answer : (B) Minimum size
Description : Which of the following factors can affect the shape and size of the pulp canal: A. Chemical irritation and caries B. Trauma and function C. Attrition, wear and aging of the patient D. All of the above
Last Answer : D. All of the above
Description : Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill. (A) Impact (B) Roll (C) Vibratory (D) None of these
Last Answer : (A) Impact
Description : Mixing of light fine powder such as insecticides is done by (A) Banbury mixer (B) Pug mill (C) Impact wheels (D) Kneader
Last Answer : (C) Impact wheels
Description : Explain principle and working of fluid energy mill with a diagram.
Last Answer : Principle It works on the principle of impact and attrition. Working: The air or inert gas is introduced with a very high pressure through nozzles. Solids are introduced into air stream through inlet. ... 100 mesh and then passed through fluid energy mill. Diagram of fluid energy mill :