Mechanical Operations MCQ Questions and answers

A

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Q. ______ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.

(A) Tumbler
(B) Banbury
(C) Muller
(D) Ribbon blender

A

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Q. 200 mesh screen means 200 openings per

(A) cm²
(B) cm
(C) inch
(D) inch²

A

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Q. 200 mesh sieve size corresponds to _________ microns.

(A) 24
(B) 74
(C) 154
(D) 200

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Q. 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

A

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Q. A _________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

(A) Compartment
(B) Tube
(C) Rod
(D) Pebble

A

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Q. A _________ mixer resembles a ball mill without balls.

(A) Banbury
(B) Pug mill
(C) Tumbling
(D) Pan

A

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Q. A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

(A) 0.90 μm/s
(B) 1 μm/s
(C) 22.1 μm/s
(D) 0.02 μm/s

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Q. A belt conveyor used for the transportation of materials can

(A) Run upto 1 km
(B) Travel at a speed upto 300 metres/minute
(C) Handle materials upto 5000 tons/hr
(D) All (A), (B) and (C)

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Q. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

(A) ½w² . R² . ρL
(B) ½w² . δ² . ρL
(C) ½w² . δρL (2R + δ)
(D) ½w² . R . ρL(R + 2δ)

A

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Q. A compressible cake has the

(A) Maximum porosity at the upstream side
(B) Maximum porosity at the filter medium
(C) Same porosity throughout the cake thickness
(D) None of these

Mechanical Operations MCQs with answers Page - 3

Q. ______ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.

Q. 200 mesh screen means 200 openings per

Q. 200 mesh sieve size corresponds to _________ microns.

Q. A _________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

Q. A _________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

Q. A _________ mixer resembles a ball mill without balls.

Q. A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

Q. A belt conveyor used for the transportation of materials can

Q. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

Q. A compressible cake has the

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