Hello students welcome to msbte news in this article we have provided 22313 Mechanical Operations Mcq Questions and Answer. This Mechanical Operations Multiple Choice Questions is ideal for Students who are in Second Year of Diploma in Chemical Engineering courses. By referring Mechanical Operations Mcq Pdf for Diploma you will get to know about the paper pattern of Msbte Mcq Winter 2021 exams.
with this Mcq on Mechanical Operations 2nd year students can practice for their upcoming Winter 2021 exams. In this Mechanical Operations Mcq Questions we have selected 30 important questions from previous year papers. you can also download Mechanical Operations Pdf below we have given a download link.
Table of Contents
22313 Mechanical Operations Mcq Questions and Answer
1. Angle of nip of the crushing rolls does not depend upon the
(A) Diameter of the rolls
(B) Speed of the rolls
(C) Product size
(D) Feed size
Correct!
Wrong!
2. Reciprocal of sphericity is termed as the
(A) Specific surface ratio
(B) Shape factor
(C) Sauter diameter
(D) Surface area per unit mass
Correct!
Wrong!
3. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
(A) Compartment mill
(B) Rod mill
(C) Pebble mill
(D) Tube mill
Correct!
Wrong!
4. As particle size is reduced
(A) Screening becomes progressively more difficult
(B) Screening becomes progressively easier
(C) Capacity and effectiveness of the screen is increased
(D) None of these
Correct!
Wrong!
5. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
(A) Kozeny-Carman
(B) Hagen-Poiseuille’s
(C) Fanning’s
(D) Kremser
Correct!
Wrong!
6. 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
Correct!
Wrong!
7. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance).
(A) √μ
(B) 1/√μ
(C) 1/μ
(D) 1/μ2
Correct!
Wrong!
8. Size measurement of ultrafine particles can be best expressed in terms of
(A) Centimeter
(B) Screen size
(C) Micron
(D) Surface area per unit mass
Correct!
Wrong!
9. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise)?
(A) Propeller
(B) Helical screw
(C) Flat blade turbine
(D) Curved blade turbine
Correct!
Wrong!
10. Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the
(A) State or manner of application of the crushing force
(B) Ultimate strength of the material
(C) Elastic constant of the material
(D) All (A), (B) and (C)
Correct!
Wrong!
11. The specific surface of spherical particles is proportional to (where, Dp = diameter of particle).
(A) D2p
(B) Dp
(C) 1/Dp
(D) 1/D2p
Correct!
Wrong!
12. During filtration operation, the filtrate encounters the resistance of the
(A) Filter medium
(B) Cake
(C) Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium
(D) All (A), (B) and (C)
Correct!
Wrong!
13. Separation of materials of the same density based on their sizes by using then-different rates of flow is called
(A) Sorting
(B) Sizing
(C) Flocculation
(D) Elutriation
Correct!
Wrong!
14. __________ is the most suitable for compounding rubber and plastic solids.
(A) Banbury mixer
(B) Pan mixer
(C) Pug mill
(D) Charge can mixer
Correct!
Wrong!
15. Pick out the wrong statement:
(A) Magnetic separation method can be employed to treat both dry & wet ores
(B) Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size
(C) Gyratory crusher is used for coarse crushing
(D) Screens are of stationary, moving and vibratory types
Correct!
Wrong!
16. What is the reduction ratio in a fine crushing operation having following feed and product sizes?Â
(A) 0.5
(B) 2
(C) 5
(D) 10
Correct!
Wrong!
17. Dust collection efficiency of electrostatic precipitators can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
(A) 200°C and 5 atm
(B) 1000°C and 10 atm
(C) 500°C and 50 atm
(D) 1000°C and 500 atm
Correct!
Wrong!
18. For a sphere falling in the constant drag coefficient regime, its terminal velocity depends on its diameter (D) as
(A) d
(B) √d
(C) d2
(D) 1/d
Correct!
Wrong!
19. Energy consumed for crushing one ton of material ranges from __________ kWh.
(A) 0.01 to 0.1
(B) 0.5 to 1.5
(C) 2 to 3.5
(D) 4 to 5
Correct!
Wrong!
20. Pick out the wrong statement.
(A) For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant
(B) Cake resistance is independent of the pressure drop
(C) Crushing of explosive materials are done by employing dry-grinding
(D) Gyratory crusher is a coarse crusher
Correct!
Wrong!
21. Sphericity of raschig ring (whose length and diameter are equal) is
(A) > 1
(B) < 1
(C) 1
(D) 2
Correct!
Wrong!
22. 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
Correct!
Wrong!
23. Which of the following gives the crushing energy required to create a new surface ?
(A) Taggarts rule
(B) Fick’s law
(C) Rittinger’s Law
(D) None of these
Correct!
Wrong!
24. 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
Correct!
Wrong!
25. The most suitable filter for the removal of very small amounts of precipitate from very large volumes of water is the __________ filter.
(A) Vacuum
(B) Sand
(C) Plate & frame
(D) Rotary
Correct!
Wrong!
26. Carbon black is pulverized in a
(A) Hammer crusher
(B) Ball mill
(C) Roll crusher
(D) Gyratory crusher
Correct!
Wrong!
27. 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 a 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)
Correct!
Wrong!
28. Which of the following is a vacuum filter?
(A) Filter press
(B) Rotary disc filter
(C) Batch basket centrifuge
(D) Tank filter (Nutsche filter)
Correct!
Wrong!
29. 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.
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