Description : Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens. (A) Jaw crusher (B) Hammer crusher (C) Ball mill (D) Tube mil
Last Answer : (B) Hammer crusher
Description : Cement clinker is reduced to fine size by a (A) Roll crusher (B) Ball mill (C) Tube mill (D) Hammer mill
Last Answer : (C) Tube mill
Description : Coal is finally pulverised to 200 mesh size for burning in boilers by a (A) Hammer crusher (B) Ball mill (C) Roll crusher (D) Gyratory crusher
Last Answer : (B) Ball mill
Description : Carbon black is pulverised in a (A) Hammer crusher (B) Ball mill (C) Roll crusher (D) Gyratory crusher
Description : Fibrous material is broken by a (A) Roll-crusher (B) Squirrel-cage disintegrator (C) Ball mill (D) Tube mill
Last Answer : (B) Squirrel-cage disintegrator
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 : 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 : Which of the following is a coarse crusher? (A) Smooth roll crusher (B) Toothed roll crusher (C) Gyratory crusher (D) Tube mill
Last Answer : (C) Gyratory crusher
Description : For the preliminary breaking of hard rock, we use a (A) Gyratory crusher (B) Ball mill (C) Tube mill (D) Squirrel-cage disintegrator
Last Answer : (A) Gyratory crusher
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 : Pick out the correct statement: (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products (B) The operating cost of ... upon the specific gravity of the minerals (D) Asphalt is best crushed using toothed roll crusher
Last Answer : (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products
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 : 3. __________ mill is normally used for grinding of talc. (A) Tube (B) Compartment (C) Ring-roll (D) Pebble
Last Answer : (A) Tube
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
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 : 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 : To get a fine talc powder from its granules, the equipment used is (A) Roller crusher (B) Ball mill (C) Jaw crusher (D) Gyratory crusher
Description : Draw symbol of (i) Tray Dryer (ii) Plate column (iii) Packed column (iv) Jaw crusher (v) Strirrer (vi) Ball mill.
Last Answer : i)Tray dryer: ii)Plate column: iii)Packed column: iv) Jaw crusher: v) Stirrer: vi) Ball mill
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 : . To produce talcum powder, use (A) Ball mill (B) Hammer mill (C) Jet mill (D) Pin mill
Last Answer : (A) Ball mill
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 : 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 (A) 0.00184 (B) 0.0184 (C) 0.184 (D) 1.84
Last Answer : (B) 0.0184
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
Last Answer : (C) Both (A) & (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)
Last Answer : (D) All (A), (B) and (C)
Description : In case of a hammer crusher, the final product size depends on the (A) Feed rate (B) Rotor speed (C) Clearance between hammer & grinding plates (D) All (A), (B) and (C
Last Answer : (D) All (A), (B) and (C
Description : . In case of a hammer crusher, the (A) Feed may be highly abrasive (Moh's scale >5) (B) Minimum product size is 3 mm (C) Maximum feed size may be 50 mm (D) Rotor shaft carrying hammers can be vertical or horizontal
Last Answer : (D) Rotor shaft carrying hammers can be vertical or horizontal
Description : Ball mills and tube mills with flint or porcelain balls are used for size reduction of (A) Asbestos (B) Rubber (C) Non-metallic ores (D) Limestone
Last Answer : (C) Non-metallic ores
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 : Fluid energy mill comes in the category of (A) Grinder (B) Crusher (C) Cutter (D) Ultrafine grinder
Last Answer : (D) Ultrafine grinder
Description : A pebble mill (A) Is a ball mill (B) Employs flints or ceramic pebbles as the grinding medium (C) Is a tube mill lined with ceramic or other non-metallic liner (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
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 : Tube mill compared to ball mill (A) Produces finer products (B) Is long in comparison with its diameter (C) Uses smaller balls (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : The main differentiation factor between tube mill and ball mill is the (A) Length to diameter ratio (B) Size of the grinding media (C) Final product size (D) Operating speed
Last Answer : (A) Length to diameter ratio
Description : A tube mill compared to a ball mill (A) Has a higher length/diameter ratio (B) Produces a coarser product (C) Has a higher diameter/length ratio (D) Uses much larger balls
Last Answer : (A) Has a higher length/diameter ratio
Description : . Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct? (A) μ > tan α (B) μ ≥ tan α (C) μ > tan 2α (D) μ ≤ tan α
Last Answer : (B) μ ≥ tan α
Description : Horsepower required for a roll crusher is directly proportional to its (A) Reduction ratio (B) Capacity (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : In a roll crusher, the specific power consumption and the production rate is affected by the (A) Reduction ratio (B) Differential roll speed (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : In a roll crusher, both the rolls (A) Have the same diameter (B) Are rotated towards each other (C) Run either at the same or different speeds (D) All (A), (B) and (C
Description : Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively). (A) cos α = (dr + dp)/(dr + df) (B) cos α = (dr + df)/(dr + dp) (C) tan α = (dr + dp)/(dr + df) (D) sin α = (dr + dp)/(dr + df)
Last Answer : (A) cos α = (dr + dp)/(dr + df)
Description : Which is a secondary crusher for a hard & tough stone? (A) Jaw crusher (B) Cone crusher (C) Impact crusher (D) Toothed roll crushe
Last Answer : (B) Cone crusher
Description : Which of the following is used for primary crushing of very hard lumpy materials? (A) Toothed roll crusher (B) Gyratory crusher
Last Answer : (B) Gyratory crusher
Description : Which of the following is a fine crusher? (A) Blake jaw crusher (B) Gyratory crusher (C) Toothed roll crusher (D) Dodge jaw crusher
Description : Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher. (A) Blake jaw (B) Toothed roll (C) Gyratory (D) None of these
Last Answer : (B) Toothed roll
Description : Which of the following achieves the least reduction ratio for a given feed size? (A) Jaw crusher (B) Roll crusher (C) Cone crusher (D) Gyratory crusher
Last Answer : (B) Roll crusher
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)
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 : Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a (A) Pug mill (B) Mixer-extruder (C) Banbury mixer (D) Muller mixer
Last Answer : (A) Pug mill
Description : The two types of cylinders used on power wheat threshers are 1. Serrated disc and rasp bar 2. Spike tooth and wire loop type 3. Spike tooth and hammer mill 4. hammer mill and flails
Last Answer : ans 3
Description : This type threasher consist of spike tooth cylinder, woven wire mesh concave and upper casing provide with helical louvers. a. Hammer mill c. Dummy d. None of above
Last Answer : Ans- b. Axial flow