chemical engineering mechanical operations MCQs – Page 5

Practise multiple-choice questions from chemical engineering mechanical operations for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs
81. Dispersion of a gas through liquid is done by using a__________________?
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A. Kneader

B. None of these

C. Sparger

D. Masticator

82. For coarse reduction of hard solids, use ____________________?
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A. Impact

B. Attrition

C. Cutting

D. Compression
83. Screen capacity is expressed in terms of____________________?
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A. tons/hr

B. tons/ft2

C. Both A. & B.

D. tons/hr-ft2
84. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
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A. Differential wettability

B. Density separation

C. Volatile matter content

D. Size

85. Tabular bowl centrifuges as compared to disk bowl centrifuges___________________?
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A. Cant be used for separation of fine suspended solids from a liquid

B. Cant be operated under pressure/vacuum

C. Employ bowl of larger diameter

D. Operate at higher speed
86. The capacity of a gyratory crusher is ______________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.?
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A. 5 times

B. Same as

C. 2.5 times

D. 10 times

87. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?
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A. Compressible cake and turbulent

B. Incompressible cake and laminar

C. Incompressible cake and turbulent

D. Compressible cakes and laminar

88. Rittingers crushing law states that_____________________?
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A. Work required in crushing is proportional to the new surface created

B. face to volume ratio of the product

C. For a given machine and feed, crushing efficiency is dependent on the size of the feed &

D. Work required to form a particle of any size is proportional to the square of the surface to

E. Work required to form a particle of a particular size is proportional to the square root of the

F. duct

89. _______________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution?
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A. Tumbler

B. Banbury

C. Muller

D. Ribbon blender

90. The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is_______________?
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A. 1.5

B. 2

C. ?2

D. ?3

91. Which of the following may prove unsuitable for filtering volatile liquids ?
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A. Gravity filter

B. Centrifugal filter

C. Pressure filter

D. Vacuum filter
92. Shell and leaf filter as compared to plate and frame filter _____________________?
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A. Entails less labor cost

B. All A., B. & C.

C. Provides more effective washing

D. Facilitates filtration under higher pressure

93. Ultra centrifuges are used for the separation of _____________ solid particles?
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A. Fine

B. Colloidal

C. Coarse

D. Dissolved

94. Ribbon blenders are exclusively meant for __________________?
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A. Continuous mixing

B. Blending miscible liquids

C. Bath mixing

D. Non-flowing powder and thin pastes
95. The critical speed of a trommel (N) is related to its dia D. as _____________________?
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A. N ? ?D

B. N ? 1/D

C. N ? 1/?D

D. N ? D

96. Dry powdery solid materials are transported by a ______________ conveyor?
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A. Belt

B. Screw

C. Bucket

D. None of these

97. Percentage of drum submerged in the slurry in case of rotary drum filter is ________________?
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A. 25

B. 85

C. 30

D. 3

98. With increase in drum speed, in a rotary drum filter, the filtration rate_______________?
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A. Is not affected

B. Increases

C. Decreases

D. Increases linearly

99. Which of the following comes in the category of primary crusher for hard and tough stone ?
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A. Cone crusher

B. None of these

C. Jaw crusher

D. Gyratory crusher

100. Which one is a filter aid ?
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A. Calcined lime

B. None of these

C. Canvas fabric

D. Diatomaceous earth