MCQOPTIONS
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MCQOPTIONS
This section includes 362 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Ultra centrifuges are used for the separation of _____________ solid particles? |
| A. | Coarse |
| B. | Fine |
| C. | Colloidal |
| D. | Dissolved |
| Answer» D. Dissolved | |
| 52. |
Two particles are called to be equal settling, if they are having the same ? |
| A. | Size |
| B. | Specific gravity |
| C. | Terminal velocities in the same fluid & in the same field of force |
| D. | None of these |
| Answer» D. None of these | |
| 53. |
Tube mill compared to ball mill_______________________? |
| A. | Produces finer products |
| B. | Is long in comparison with its diameter |
| C. | Uses smaller balls |
| D. | All A., B. & C. |
| Answer» E. | |
| 54. |
Trommels are revolving screens which normally operate in the range of _______________ rpm? |
| A. | 1 – 2 |
| B. | 15 – 20 |
| C. | 40 – 50 |
| D. | 60 – 75 |
| Answer» C. 40 – 50 | |
| 55. |
Trommels separate a mixture of particles depending on their_____________________? |
| A. | Size |
| B. | Density |
| C. | Wettability |
| D. | Electrical & magnetic properties |
| Answer» B. Density | |
| 56. |
Trommels employ _____________ for screening of materials? |
| A. | Fibrous cloth |
| B. | Woven wire screen |
| C. | Punched plate |
| D. | None of these |
| Answer» D. None of these | |
| 57. |
Traces of liquid tar fog present in coke oven gas is separated using____________________? |
| A. | Electrostatic precipitator |
| B. | Cyclone separator |
| C. | Strainer |
| D. | None of these |
| Answer» B. Cyclone separator | |
| 58. |
Toothed roll crushers achieve size reduction by___________________? |
| A. | Tearing (shear) and compression |
| B. | Impact and attrition |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 59. |
To remove very small amount of tiny solid impurities from liquid, we use a_____________________? |
| A. | Pressure filter |
| B. | Vacuum filter |
| C. | Centrifugal filter |
| D. | Coagulant |
| Answer» E. | |
| 60. |
To remove dirt from the flowing fluid, we use a ____________________? |
| A. | Coagulant |
| B. | Gravity settler |
| C. | Strains |
| D. | Clarifier |
| Answer» D. Clarifier | |
| 61. |
To produce talcum powder, use_____________________? |
| A. | Ball mill |
| B. | Hammer mill |
| C. | Jet mill |
| D. | Pin mill |
| Answer» B. Hammer mill | |
| 62. |
To get ultrafine particles, the equipment used is a _________________? |
| A. | Ball mill |
| B. | Rod mill |
| C. | Hammer crusher |
| D. | Fluid energy mill |
| Answer» E. | |
| 63. |
To get a fine talc powder from its granules, the equipment used is____________________? |
| A. | Roller crusher |
| B. | Ball mill |
| C. | Jaw crusher |
| D. | Gyratory crusher |
| Answer» C. Jaw crusher | |
| 64. |
There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores? |
| A. | Classification |
| B. | Tabling |
| C. | Jigging |
| D. | Froth floatation |
| Answer» E. | |
| 65. |
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ? |
| A. | 3.6 V.W.Dr.ρ |
| B. | 3.6 V.W. ρ |
| C. | 3.6 W.Dr.ρ |
| D. | 3.6 V.W.Dr/ρ |
| Answer» B. 3.6 V.W. ρ | |
| 66. |
The work index in Bond’s law for crushing of solids has the following dimensions__________________? |
| A. | No units (dimensionless) |
| B. | kWh/ton |
| C. | kW/ton |
| D. | kWh.m1/2/ton |
| Answer» C. kW/ton | |
| 67. |
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be_________________? |
| A. | 0.5 Wi |
| B. | Wi |
| C. | 1.34 Wi |
| D. | 3.34 Wi |
| Answer» D. 3.34 Wi | |
| 68. |
The value of ‘angle of nip’ is generally about__________________? |
| A. | 16° |
| B. | 32° |
| C. | 52° |
| D. | 64° |
| Answer» C. 52° | |
| 69. |
The unit of specific cake resistance is______________________? |
| A. | gm/cm2 |
| B. | cm/gm |
| C. | cm/gm2 |
| D. | gm/gm |
| Answer» B. cm/gm | |
| 70. |
The unit of filter medium resistance is________________? |
| A. | cm-1 |
| B. | gm/cm-1 |
| C. | cm/gm-1 |
| D. | gm-1 |
| Answer» B. gm/cm-1 | |
| 71. |
The term ‘angle of nip’ is concerned with the operation of the ____________ crushers? |
| A. | Jaw |
| B. | Roll |
| C. | Gyratory |
| D. | None of these |
| Answer» C. Gyratory | |
| 72. |
The study on washability of coal is done by using the _____________ technique? |
| A. | Tabling |
| B. | Elutriation |
| C. | Heavy media separation |
| D. | None of these |
| Answer» D. None of these | |
| 73. |
The sphericity of a solid particle of cubical shape is ___________________? |
| A. | π |
| B. | (π/6)1/3 |
| C. | (π/6)1/2 |
| D. | π/3 |
| Answer» C. (π/6)1/2 | |
| 74. |
The sphericity of a cylinder of 1 mm diameter and length 3 mm is_________________? |
| A. | 0.9 |
| B. | 0.78 |
| C. | 0.6 |
| D. | 0.5 |
| Answer» B. 0.78 | |
| 75. |
The speed of a rotary drum vacuum filter may be about _____________ rpm? |
| A. | 1 |
| B. | 50 |
| C. | 100 |
| D. | 500 |
| Answer» B. 50 | |
| 76. |
The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)? |
| A. | D2 |
| B. | Dp |
| C. | 1/Dp |
| D. | 1/D2p |
| Answer» D. 1/D2p | |
| 77. |
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ? |
| A. | 6/D.ρ |
| B. | 2/D.ρ |
| C. | 4/D.ρ |
| D. | 12/D.ρ |
| Answer» B. 2/D.ρ | |
| 78. |
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 |
| Answer» E. | |
| 79. |
The specific cake resistance for compressible sludges is a function of the pressure drop__________________? |
| A. | Over cake |
| B. | Over medium |
| C. | Overall |
| D. | None of these |
| Answer» B. Over medium | |
| 80. |
The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size)? |
| A. | c/s |
| B. | s/c |
| C. | s . c |
| D. | 1/s . c |
| Answer» B. s/c | |
| 81. |
The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ? |
| A. | Df/Dp |
| B. | Dp/Df |
| C. | Df – Dp |
| D. | None of these |
| Answer» B. Dp/Df | |
| 82. |
The reduction ratio for fine grinders is_____________? |
| A. | 5-10 |
| B. | 10-20 |
| C. | 20-40 |
| D. | As high as 100 |
| Answer» E. | |
| 83. |
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. | √2 |
| D. | None of these |
| Answer» E. | |
| 84. |
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is_______________? |
| A. | 2 |
| B. | √2 |
| C. | 1.5 |
| D. | √3 |
| Answer» C. 1.5 | |
| 85. |
The process opposite to ‘dispersion’ is termed as the___________________? |
| A. | Flocculation |
| B. | Sedimentation |
| C. | Filtration |
| D. | None of these |
| Answer» B. Sedimentation | |
| 86. |
The process by which fine solids is removed from liquids is termed as _____________________? |
| A. | Decantation |
| B. | Flocculation |
| C. | Sedimentation |
| D. | Classification |
| Answer» D. Classification | |
| 87. |
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________? |
| A. | N° |
| B. | N1 |
| C. | N2 |
| D. | N3 |
| Answer» D. N3 | |
| 88. |
The porosity of a compressible cake is _____________________? |
| A. | Minimum at the filter medium |
| B. | Minimum at the upstream face |
| C. | Maximum at the filter medium |
| D. | Same throughout the thickness of cake |
| Answer» B. Minimum at the upstream face | |
| 89. |
The optimum moisture content in solids to be crushed/ground ranges from _______________ percent? |
| A. | 3 to 4 |
| B. | 8 to 10 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» B. 8 to 10 | |
| 90. |
The operating speed of a ball mill should be ______________ the critical speed? |
| A. | Less than |
| B. | Much more than |
| C. | At least equal to |
| D. | Slightly more than |
| Answer» B. Much more than | |
| 91. |
The opening of a 200 mesh screen (Taylor series) is__________________? |
| A. | 0.0074 cm |
| B. | 0.0074 mm |
| C. | 0.0047 cm |
| D. | 74 milli-microns |
| Answer» B. 0.0074 mm | |
| 92. |
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 |
| Answer» C. Plate & frame | |
| 93. |
The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a __________________? |
| A. | Boundary mixer |
| B. | Propeller agitator |
| C. | Sharpies centrifuge |
| D. | None of these |
| Answer» B. Propeller agitator | |
| 94. |
The most suitable equipment for the transportation of 200 mesh size particles is a _______________? |
| A. | Bucket elevator |
| B. | Pneumatic conveyor |
| C. | Screw conveyor |
| D. | Belt conveyor |
| Answer» C. Screw conveyor | |
| 95. |
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________? |
| A. | Bag filter |
| B. | Electrostatic precipitator |
| C. | Cyclone separator |
| D. | Wet scrubber |
| Answer» C. Cyclone separator | |
| 96. |
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the__________________? |
| A. | Venturi atomiser |
| B. | Gravity settling chamber |
| C. | Electro-static precipitator |
| D. | Cyclone separator |
| Answer» D. Cyclone separator | |
| 97. |
The most common filter aid is_________________? |
| A. | Diatomaceous earth |
| B. | Calcium silicate |
| C. | Sodium carbonate |
| D. | Silica gel |
| Answer» B. Calcium silicate | |
| 98. |
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. | |
| 99. |
The maximum slope of a belt conveyor can be_____________________? |
| A. | 15° |
| B. | 30° |
| C. | 45° |
| D. | 60° |
| Answer» C. 45° | |
| 100. |
The material is crushed in a gyratory crusher by the action of__________________? |
| A. | Impact |
| B. | Compression |
| C. | Attrition |
| D. | Cutting |
| Answer» C. Attrition | |