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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 6051. |
Wet seiving is employed, when the product contains __________ materials. |
| A. | abrasive |
| B. | large quantity of very fine |
| C. | coarse |
| D. | non-sticky |
| Answer» C. coarse | |
| 6052. |
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms. |
| A. | 20 |
| B. | 12 |
| C. | 8 |
| D. | 2 |
| Answer» E. | |
| 6053. |
Which of the following may prove unsuitable for filtering volatile liquids ? |
| A. | Pressure filter |
| B. | Gravity filter |
| C. | Centrifugal filter |
| D. | Vacuum filter |
| Answer» E. | |
| 6054. |
__________ mean diameter of particles is given by |
| A. | Mass |
| B. | volume |
| C. | Arithmetic |
| D. | Volume surface |
| Answer» C. Arithmetic | |
| 6055. |
The filter medium resistance is controlled by |
| A. | pressure drop alone |
| B. | flow rate alone |
| C. | both pressure drop and flow rate |
| D. | cake thickness |
| Answer» D. cake thickness | |
| 6056. |
During size reduction by a jaw crusher, the energy consumed decreases with the |
| A. | decreasing size of product at constant size of feed. |
| B. | decreasing machine capacity. |
| C. | increasing size of feed at constant reduction ratio. |
| D. | none of these. |
| Answer» D. none of these. | |
| 6057. |
Which of the following can be most effectively used for clarification of lube oil and printing ink? |
| A. | Sparkler filter |
| B. | Precoat filter |
| C. | Disc-bowl centrifuge |
| D. | Sharpies supercentrifuge |
| Answer» E. | |
| 6058. |
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the |
| A. | separation of isotopes based on their density or molecular weights difference. |
| B. | concentration of rubber latex. |
| C. | separation of cream from milk. |
| D. | dewaxing of lubricating oil. |
| Answer» B. concentration of rubber latex. | |
| 6059. |
Kick's law relates to |
| A. | energy consumption |
| B. | final particle size |
| C. | feed size |
| D. | none of these |
| Answer» B. final particle size | |
| 6060. |
__________ mill is normally used for grinding of talc. |
| A. | Tube |
| B. | Compartment |
| C. | Ring-roll |
| D. | Pebble |
| Answer» D. Pebble | |
| 6061. |
__________ baffles are provided in ball mills. |
| A. | Horizontal |
| B. | No |
| C. | Only two |
| D. | None of these |
| Answer» B. No | |
| 6062. |
Mixer used for rubber compounding is |
| A. | mixer-extruder |
| B. | banbury internal mixer |
| C. | muller mixer |
| D. | pug mill |
| Answer» C. muller mixer | |
| 6063. |
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products. |
| A. | Buhrstone |
| B. | Roller |
| C. | Attrition |
| D. | Pebble |
| Answer» E. | |
| 6064. |
In case of a hammer crusher, the final product size depends on the |
| A. | feed rate. |
| B. | rotor speed. |
| C. | clearance between hammer & grinding plates. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 6065. |
Pine oil and cresylic acid are used as __________ in the froth floatation process. |
| A. | frother |
| B. | collector |
| C. | depressor |
| D. | conditioner |
| Answer» B. collector | |
| 6066. |
Grinding characteristic of a material is given by its |
| A. | HGI |
| B. | angle of repose |
| C. | shatter index |
| D. | abrasion index. |
| Answer» B. angle of repose | |
| 6067. |
Which of the following is not a non-metalliferous mineral? |
| A. | Calcite |
| B. | Fluorspar |
| C. | Quartz |
| D. | Cassiterrite |
| Answer» E. | |
| 6068. |
Wet grinding in a revolving mill __________ as compared to dry grinding. |
| A. | gives less wear on chamber walls |
| B. | requires more energy |
| C. | increases capacity |
| D. | complicates handling of the product |
| Answer» D. complicates handling of the product | |
| 6069. |
The grinding in a hammer crusher takes place due to the |
| A. | attrition |
| B. | impact |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 6070. |
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. |
| Answer» B. maximum porosity at the filter medium. | |
| 6071. |
Which of the following is not used as a filter medium in case of corrosive liquids ? |
| A. | Nylon |
| B. | Glass cloth |
| C. | Metal cloth of monel or stainless steel |
| D. | Cotton fabric |
| Answer» E. | |
| 6072. |
For raschig rings, the sphericity is |
| A. | 0.5 |
| B. | 1 |
| C. | <1 |
| D. | <span class="root">3</span> |
| Answer» D. <span class="root">3</span> | |
| 6073. |
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. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 5000 |
| Answer» D. 5000 | |
| 6074. |
__________ mills are termed as disintegrators. |
| A. | Cage |
| B. | Compartment |
| C. | Pebble |
| D. | All tumbling |
| Answer» B. Compartment | |
| 6075. |
Supporting legs of a plate and frame filter is normally made of |
| A. | stainless steel |
| B. | cast iron |
| C. | high speed steel |
| D. | wooden plank |
| Answer» C. high speed steel | |
| 6076. |
The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ) is given by |
| A. | <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/mechanical-operations/136-492-3.png"> | |
| 6077. |
Mixing of plastic solids is generally facilitated by |
| A. | dispersion |
| B. | mastication |
| C. | kneading |
| D. | none of these |
| Answer» D. none of these | |
| 6078. |
The mechanism of size reduction by a hammer mill is by impact and attrition between the |
| A. | grinding element & the housing. |
| B. | feed particles. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6079. |
Which of the following is not an industrial screening equipment ? |
| A. | Sharpies centrifuge |
| B. | Vibrating screen |
| C. | Grizzly |
| D. | Trommel |
| Answer» B. Vibrating screen | |
| 6080. |
Which of the following is not a wet classifier ? |
| A. | Sharpies supercentrifuge |
| B. | Hydrocyclones |
| C. | Dorr Oliver rake classifier |
| D. | None of these |
| Answer» E. | |
| 6081. |
A cottrel precipitator makes use of the __________ for dusty air cleaning. |
| A. | electric spark |
| B. | corrona discharge |
| C. | alternating current |
| D. | none of these. |
| Answer» C. alternating current | |
| 6082. |
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the |
| A. | linear speed of the basket is doubled. |
| B. | linear speed of the basket is halved. |
| C. | centrifugal force is doubled. |
| D. | capacity of centrifuge is increased. |
| Answer» D. capacity of centrifuge is increased. | |
| 6083. |
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is |
| A. | 1.5 |
| B. | 1 |
| C. | <span class="root">2</span> |
| D. | none of these |
| Answer» E. | |
| 6084. |
Compressibility co-efficient for an absolutely compressible cake is |
| A. | 0 |
| B. | 1 |
| C. | 0 to 1 |
| D. | |
| Answer» C. 0 to 1 | |
| 6085. |
In froth floatation, chemical agent added to cause air adherence is called |
| A. | collector |
| B. | frother |
| C. | modifier |
| D. | activator |
| Answer» B. frother | |
| 6086. |
Vertical transportation of materials can be done by a/an |
| A. | apron conveyor |
| B. | pneumatic conveyor |
| C. | bucket elevator |
| D. | both(b)&(c) |
| Answer» E. | |
| 6087. |
Sedimentation on commercial scale occurs in |
| A. | classifiers |
| B. | thickeners |
| C. | rotary drum filters |
| D. | cyclones |
| Answer» D. cyclones | |
| 6088. |
With increase in drum speed, in a rotary drum filter, the filtration rate |
| A. | increases |
| B. | increases linearly |
| C. | decreases |
| D. | is not affected |
| Answer» B. increases linearly | |
| 6089. |
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them. |
| A. | Jaw crusher, Ball mill, Fluid energy mill |
| B. | Ball mill, Jaw crusher, Fluid energy mill |
| C. | Fluid energy mill, Jaw crusher, Ball mill |
| D. | Fluid energy mill, Ball mill, Jaw crusher |
| Answer» B. Ball mill, Jaw crusher, Fluid energy mill | |
| 6090. |
200 mesh seive size corresponds to __________ microns. |
| A. | 24 |
| B. | 74 |
| C. | 154 |
| D. | 200 |
| Answer» C. 154 | |
| 6091. |
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls ? |
| A. | 16 |
| B. | 32 |
| C. | 40 |
| D. | 46 |
| Answer» C. 40 | |
| 6092. |
In a roll crusher, the specific power consumption and the production rate is affected by the |
| A. | reduction ratio. |
| B. | differential roll speed. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6093. |
Which of the following is not accomplished by agitation of liquids in agitators? |
| A. | Dispersing gas in liquid. |
| B. | Blending of immiscible liquids. |
| C. | Dispersing immiscible liquid in form of emulsion. |
| D. | Suspending solid particles. |
| Answer» C. Dispersing immiscible liquid in form of emulsion. | |
| 6094. |
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ? |
| A. | Check plates |
| B. | Jaw plates |
| C. | Toggles |
| D. | Crush shaft |
| Answer» C. Toggles | |
| 6095. |
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 m/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is |
| A. | 0.90 m/s |
| B. | 1 m/s |
| C. | 22.1 m/s |
| D. | 0.02 m/s |
| Answer» C. 22.1 m/s | |
| 6096. |
The specific surface of spherical particles is given by (where D and are diameter and density of particle). |
| A. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-134-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-134-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-134-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-134-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/mechanical-operations/106-134-2.png"> | |
| 6097. |
Filter medium resistance is important during the __________ of filtration. |
| A. | early stages. |
| B. | final stages. |
| C. | entire process. |
| D. | none of these. |
| Answer» B. final stages. | |
| 6098. |
Float and sink test determines the possibility of cleaning of coal by a process based on the |
| A. | gravity separation |
| B. | wettability |
| C. | particle shape |
| D. | none of these |
| Answer» B. wettability | |
| 6099. |
Colloidal mills are used for __________ grinding. |
| A. | coarse |
| B. | intermediate |
| C. | fine |
| D. | ultrafine |
| Answer» E. | |
| 6100. |
For classification of potable (drinking) water, we use a __________ filter. |
| A. | gravity sand |
| B. | plate and frame |
| C. | vacuum leaf |
| D. | rotary vacuum |
| Answer» B. plate and frame | |