Lakshya Education MCQs

Question: Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
Options:
A.Check plates
B.Jaw plates
C.Toggles
D.Crush shaft
Answer: Option B

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More Questions on This Topic :

Question 1. Which of the following mechanical conveyors does not come under the division 'carriers'?
  1.    Belt conveyor
  2.    Bucket elevator
  3.    Screw conveyor
  4.    Apron conveyor
Answer: Option C
Question 2. Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?
  1.    Ribbon conveyor
  2.    Flight conveyor
  3.    Bucket elevators
  4.    Drag conveyor
Answer: Option C
Question 3. In case of a revolving mill, wet grinding compared to dry grinding
  1.    Requires more energy
  2.    Has less capacity
  3.    Complicates handling & classification of the product
  4.    None of these
Answer: Option D
Question 4. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called
  1.    Classification
  2.    Sedimentation
  3.    Clarification
  4.    Decantation
Answer: Option B
Question 5. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
  1.    Feed material
  2.    Type of crushing machine
  3.    Both A & B
  4.    Neither A nor B
Answer: Option C
Question 6. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.
  1.    Po ∝ Re-1.0
  2.    Po ∝ Re0.0
  3.    Po ∝ Re0.5
  4.    Po ∝ Re1.0
Answer: Option B

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