Mechanical Operations Lab Manual Chemical Engineering MCQ - Set 03 - ObjectiveBooks

Mechanical Operations Lab Manual Chemical Engineering MCQ - Set 03

Practice Test: Question Set - 03

1. Sphericity of raschig ring (whose length and diameter are equal) is
    (A) > 1
    (B) < 1
    (C) 1
    (D) 2

2. For efficient grinding, ball mills must be operated
    (A) At a speed less than the critical speed
    (B) At a speed more than the critical speed
    (C) At a speed equal to the critical speed
    (D) With minimum possible small balls

3. Which of the following gives the crushing energy required to create new surface?
    (A) Taggarts rule
    (B) Fick's law
    (C) Rittinger's Law
    (D) None of these

4. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
    (A) Easier grindability
    (B) Poor grindability
    (C) High power consumption in grinding
    (D) None of these

5. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
    (A) Vacuum
    (B) Sand
    (C) Plate & frame
    (D) Rotary

6. Carbon black is pulverized in a
    (A) Hammer crusher
    (B) Ball mill
    (C) Roll crusher
    (D) Gyratory crusher

7. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
    (A) British standard screens
    (B) German standard screens (DIN 1171) etc
    (C) American standard screens (ASTM and Tyler standard screens)
    (D) All (a), (b) and (c)

8. Which of the following is a vacuum filter?
    (A) Filter press
    (B) Rotary disc filter
    (C) Batch basket centrifuge
    (D) Tank filter (Nutsche filter)

9. In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.
    (A) Secondary
    (B) Fine
    (C) Primary
    (D) Ultrafine

10. A fluid energy mill is used for
    (A) Cutting
    (B) Grinding
    (C) Ultra grinding
    (D) Crushing

11. __________ centrifuge is the most suitable for separation of non-friable crystals.
    (A) Tubular bowl
    (B) Disc-bowl
    (C) Perforated horizontal basket continuous
    (D) Suspended batch basket

12. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
    (A) Sand bed filter
    (B) Plate and frame filter press
    (C) Vacuum filter
    (D) Batch basket centrifuge

13. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
    (A) > 10
    (B) < 10
    (C) > 100
    (D) < 100

14. The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
    (A)  ΔP
    (B)  1/ ΔP
    (C)  √ΔP
    (D) Independent of ΔP

15. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
    (A) Thickener
    (B) Classifier
    (C) Strainer
    (D) Clarifier

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