Mechanical Operations(Engineering > Chemical Engineering ) Questions and Answers

Question 1. The grinding in a hammer crusher takes place due to the
  1.    Attrition
  2.    Impact
  3.    Both A & B
  4.    Neither A nor B
Explanation:-
Answer: Option C. -> Both A & B
Question 2. Reduction ratio of crushers is the
  1.    Ratio of feed opening to discharge opening
  2.    Ratio of discharge opening to feed opening
  3.    Determining factor for minimum dia of the feed and the product
  4.    None of these
Explanation:-
Answer: Option A. -> Ratio of feed opening to discharge opening
Question 3. Additives used for promoting the floccula-tion of particles is a/an
  1.    Electrolyte
  2.    Surface active agent
  3.    Both A & B
  4.    Neither A nor B
Explanation:-
Answer: Option C. -> Both A & B
Question 4. Separation of solid particles based on their densities is called
  1.    Sizing
  2.    Sorting
  3.    Clarification
  4.    Dispersion
Explanation:-
Answer: Option B. -> Sorting
Question 5. The sphericity of a solid particle of cubical shape is
  1.    π
  2.    (π/6)1/3
  3.    (π/6)1/2
  4.    π/3
Explanation:-
Answer: Option B. -> (π/6)1/3
Question 6. For separation of sugar solution from settled out mud, we use a __________ filter.
  1.    Sparkler
  2.    Plate and frame
  3.    Centrifugal
  4.    Rotary drum vaccum
Explanation:-
Answer: Option C. -> Centrifugal
Question 7. Energy consumption in a crusher decreases with increase in the
  1.    Size of the product (at constant feed size)
  2.    Capacity of the crushing machine
  3.    Size of feed (at constant reduction ratio)
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 8. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
  1.    D
  2.    √d
  3.    D²
  4.    1/d
Explanation:-
Answer: Option C. -> D²
Question 9. Ribbon blenders are exclusively meant for
  1.    Blending miscible liquids
  2.    Non-flowing powder and thin pastes
  3.    Bath mixing
  4.    Continuous mixing
Explanation:-
Answer: Option B. -> Non-flowing powder and thin pastes
Question 10. Diatomaceous earth is a/an
  1.    Explosive
  2.    Filter aid
  3.    Filter medium
  4.    Catalyst
Explanation:-
Answer: Option B. -> Filter aid
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