Most Latest Mechanical Operations MCQs – Updated Chemical Engineering MCQs
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Latest Chemical Engineering MCQs
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Latest Mechanical Operations Mcqs
The most occurred mcqs of Mechanical Operations in past papers. Past papers of Mechanical Operations Mcqs. Past papers of Mechanical Operations Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Mechanical Operations Mcqs. The Important series of Mechanical Operations Mcqs are given below:
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
A. 0.50
B. 0.68
C. 0.58
D. 0.62
____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
A. Screw
B. Belt
C. Bucket
D. Apron
____________ mills fall in the category of tumbling mills ?
A. Rod and tube
B. Ball and pebble
C. Compartment
D. All A., B. & C.
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?
A. 50
B. 0.30
C. 0.007
D. 0.014
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?
A. 50
B. 5
C. 500
D. 5000
Which of the following is not categorised as a “mechanical operation”?
A. Filtration
B. Agitation
C. Size enlargement
D. Humidification
Grinding characteristic of a material is given by its___________________?
A. HGI
B. Shatter index
C. Angle of repose
D. Abrasion index
Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?
A. Rubber
B. Asbestos
C. Non-metallic ores
D. Limestone
Gravity settling process is not involved in the working of a________________?
A. Hydrocyclone
B. Dorr-thickener
C. Classifier
D. Sedimentation tank
With increase in drum speed, in a rotary drum filter, the filtration rate_______________?
A. Increases
B. Decreases
C. Increases linearly
D. Is not affected
Mixing of plastic solids is generally facilitated by___________________?
A. Mastication
B. Dispersion
C. Kneading
D. None of these
The main size reduction operation in ultrafine grinders is_____________?
A. Compression
B. Attrition
C. Cutting
D. Impact
Which of the following is not used as a filter medium in case of corrosive liquids?
A. Glass cloth
B. Nylon
C. Metal cloth of monel or stainless steel
D. Cotton fabric
Which of the following is a pressure filter ?
A. Rotary drum filter
B. Plate and flame filter
C. Leaf filter (Moore filter)
D. Sand filter
Mechanical Operations Mcqs
200 mesh sieve size corresponds to _____________ microns?
A. 154
B. 74
C. 24
D. 200
Which of the following mineral dressing operations is termed as ‘comminution’?
A. Panning
B. Tabling
C. Spiralling
D. None of these
Which of the following is not an industrial screening equipment ?
A. Sharpies centrifuge
B. Grizzly
C. Vibrating screen
D. Trommel
Highly viscous liquids & pastes are agitated by________________?
A. Turbine agitators
B. Propellers
C. Multiple blade paddles
D. None of these
Supporting legs of a plate and frame filter is normally made of________________?
A. High speed steel
B. Cast iron
C. Stainless steel
D. Wooden plank
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A. 40°
B. 32°
C. 16°
D. 46°
Size reduction of _____________ is accomplished in steam heated rollers and roll crushers?
A. Gums
B. Resins
C. Hard rubber
D. Waxes
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the_________________?
A. Linear speed of the basket is halved
B. Linear speed of the basket is doubled
C. Centrifugal force is doubled
D. Capacity of centrifuge is increased
Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is_____________________?
A. 0.1 to 0.3
B. 0.01 to 0.1
C. 0.2 to 0.8
D. 0.2 to 0.4
Tabular bowl centrifuges as compared to disk bowl centrifuges___________________?
A. Operate at higher speed
B. Can’t be operated under pressure/vacuum
C. Employ bowl of larger diameter
D. Can’t be used for separation of fine suspended solids from a liquid
_____________ Centrifuge is normally used in sugar mills?
A. Disc-bowl
B. Tubular bowl
C. Suspended batch basket
D. Perforated horizontal basket continuous
Vertical transportation of materials can be done by a/an_______________?
A. Apron conveyor
B. Bucket elevator
C. Pneumatic conveyor
D. Both B. & C.
The capacity of a pneumatic conveying system depends upon the ______________________?
A. Pressure of the conveying air
B. Bulk density of materials
C. Diameter of the conveying line
D. All A., B. and C.
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?
A. Toggles
B. Jaw plates
C. Check plates
D. Crush shaft
The term ‘angle of nip’ is concerned with the operation of the ____________ crushers?
A. Gyratory
B. Roll
C. Jaw
D. None of these
Fuels And Combustion Mcqs
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
A. Rittinger’s law
B. Bond’s law
C. Kick’s law
D. None of these
_____________ mills are termed as disintegrators?
A. Cage
B. Pebble
C. Compartment
D. All tumbling
Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?
A. 0.2 to 0.8
B. 50 to 100
C. 5 to 25
D. 100 to 250
The speed of a rotary drum vacuum filter may be about _____________ rpm?
A. 1
B. 100
C. 50
D. 500
______________ is used for producing a thick suspension from a thin slurry?
A. Rotary drum vacuum filter
B. Cartridge filter
C. Pressure filter thickener
D. Plate and frame filter press
The study on washability of coal is done by using the _____________ technique?
A. Elutriation
B. Tabling
C. Heavy media separation
D. None of these
In the cyclone separator used for separation of dust from dust laden gas, the gas ?
A. Enters the cyclone from the top
B. Develops a helical motion inside the chamber
C. Is admitted tangentially at high velocity
D. Both B. and C.
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
A. Parabola
B. Hyperbola
C. Straight line
D. Exponential curve
Colloidal mills are used for ______________ grinding?
A. Intermediate
B. Coarse
C. Fine
D. Ultrafine
The unit of specific cake resistance is______________________?
A. gm/cm2
B. cm/gm2
C. cm/gm
D. gm/gm
Weber number is significant and is concerned with the_________________?
A. Liquid-liquid mixing
B. Solid-liquid mixing
C. Dispersion of liquid in liquid
D. Suspension of solid in liquid
Horsepower required for a roll crusher is directly proportional to its__________________?
A. Capacity
B. Reduction ratio
C. Both A. & B.
D. Neither A. nor B.
______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)?
A. Arithmetic
B. Volume
C. Mass
D. Volume surface
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_________________?
A. Type of crushing machine
B. Feed material
C. Both A. & B.
D. Neither A. nor B.
What is the selectivity index, if the grade of tailings & concentrate is the same ?
A. ∞
B. 0
C. 1
D. 0.5
Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?
A. Apron
B. Screw
C. Belt
D. Flight
Moisture can be removed from lubricating oil using_________________?
A. Tubular centrifuge
B. Sparkler filter
C. Clarifier
D. Vacuum leaf filter
Cartridge filters are termed as ‘edge’ filters, because of the fact that the_________________?
A. Solids are not deposited at the edge of the disk
B. Disks have very sharp edge
C. Bulk of the solids are removed at the periphery of the disks
D. None of these
Fick’s law relates to_________________?
A. Energy consumption
B. Feed size
C. Final particle size
D. None of these
Mass Transfer Mcqs
Production rate _____________ with increased fineness, with a given energy input to the size reduction machine?
A. Decreases
B. Remains unchanged
C. Increases
D. May increase or decrease; depends on the machine
The material is crushed in a gyratory crusher by the action of__________________?
A. Attrition
B. Compression
C. Impact
D. Cutting
Trommels employ _____________ for screening of materials?
A. Woven wire screen
B. Fibrous cloth
C. Punched plate
D. None of these
For classification of potable (drinking) water, we use a _______________ filter?
A. Gravity sand
B. Vacuum leaf
C. Plate and frame
D. Rotary vacuum
The value of ‘angle of nip’ is generally about__________________?
A. 52°
B. 32°
C. 16°
D. 64°
In a roll crusher, the specific power consumption and the production rate is affected by the_________________?
A. Differential roll speed
B. Reduction ratio
C. Both A. and B.
D. Neither A. nor B.
Filter aid is used to____________________?
A. Decrease the pressure drop
B. Increase the rate of filtration
C. Increase the porosity of the cake
D. Act as a support base for the septum
Sedimentation on commercial scale occurs in____________________?
A. Thickeners
B. Classifiers
C. Rotary drum filters
D. Cyclones
Diatomaceous earth is a/an_________________?
A. Filter medium
B. Filter aid
C. Explosive
D. Catalyst
Filter medium resistance is important during the ______________ of filtration?
A. Early stages
B. Entire process
C. Final stages
D. None of these
A compressible cake has the_________________?
A. Maximum porosity at the upstream side
B. Same porosity throughout the cake thickness
C. Maximum porosity at the filter medium
D. None of these
Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
A. Impact
B. Vibratory
C. Roll
D. None of these
Filter medium resistance is that offered by the__________________?
A. Embedded particles in the septum
B. Filter cloth
C. Filter cloth and the embedded particle collectively
D. None of these
Pick out the wrong statement ?
A. The angle of nip (2α) is the angle between roll faces at the level where they will just take hold of a particle and draw it in the crushing zone
B. Gape is the greatest distance between the crushing surfaces or the jaws
C. Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing
D. Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the product
Energy consumption in a crusher decreases with increase in the________________________?
A. Capacity of the crushing machine
B. Size of the product (at constant feed size)
C. Size of feed (at constant reduction ratio)
D. All A., B. & C.
Mixing of light fine powder such as insecticides is done by____________________?
A. Pug mill
B. Banbury mixer
C. Impact wheels
D. Kneader
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?
A. 12
B. 20
C. 8
D. 2
A widely used size reduction equipment for ______________ is Bradford breaker?
A. Iron core
B. Coal
C. Talc
D. Wheat
Fluid medium used in the classification technique of mineral beneficiation is_________________?
A. Water
B. Air
C. Either A. or B.
D. Neither A. nor B.
Which of the following is not a non-metalliferous mineral ?
A. Fluorspar
B. Calcite
C. Quartz
D. Cassiterite
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.) ?
A. 1/D
B. D
C. D2.5
D. 1/D2.5
Helical screw agitator is used for________________?
A. Mixing highly viscous pastes
B. Mixing liquids at very high temperature (> 250 °C)
C. Blending immiscible liquids
D. None of these