MCQOPTIONS
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MCQOPTIONS
This section includes 398 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
*/*_Shape factor for a cylinder whose length equals its diameter is? |
| A. | 1.5 |
| B. | 0.5 |
| C. | 1.0 |
| D. | 2.0 |
| Answer» B. 0.5 | |
| 102. |
*/*___________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.? |
| A. | Cast iron |
| B. | Minimum size |
| C. | Maximum size |
| D. | Elliptical |
| Answer» C. Maximum size | |
| 103. |
*/*_During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration? |
| A. | At time zero |
| B. | At the end of filtration |
| C. | When half the filtrate has been obtained |
| D. | At the end of filtration, but decreases with time subsequently |
| Answer» C. When half the filtrate has been obtained | |
| 104. |
*/*_In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).? |
| A. | Weber |
| B. | Peclet |
| C. | Brinkman |
| D. | Schmidt |
| Answer» C. Brinkman | |
| 105. |
*/*_In case of a hammer crusher, the? |
| A. | Feed may be highly abrasive (Moh's scale >5) |
| B. | Minimum product size is 3 mm |
| C. | Maximum feed size may be 50 mm |
| D. | Rotor shaft carrying hammers can be vertical or horizontal |
| Answer» E. | |
| 106. |
*/*_Dust laden air can be purified using a? |
| A. | Cyclone separator |
| B. | Bag filter |
| C. | Gravity settler |
| D. | Tubular centrifuge |
| Answer» B. Bag filter | |
| 107. |
*/*_Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.? |
| A. | Kozney-Karman |
| B. | Hagen-Poiseulle's |
| C. | Fanning's |
| D. | Kremser |
| Answer» B. Hagen-Poiseulle's | |
| 108. |
*/*_Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a? |
| A. | Disc bowl centrifuge |
| B. | Sharpies supercentrifuge |
| C. | Batch basket centrifuge |
| D. | Sparkler filter |
| Answer» B. Sharpies supercentrifuge | |
| 109. |
*/*_Which of the following is not an industrial screening equipment?? |
| A. | Sharpies centrifuge |
| B. | Vibrating screen |
| C. | Grizzly |
| D. | Trommel |
| Answer» B. Vibrating screen | |
| 110. |
*/*_Diatomaceous earth is a/an? |
| A. | Explosive |
| B. | Filter aid |
| C. | Filter medium |
| D. | Catalyst |
| Answer» C. Filter medium | |
| 111. |
*/*_Grindability of a material does not depend upon its? |
| A. | Elasticity |
| B. | Hardness |
| C. | Toughness |
| D. | Size |
| Answer» E. | |
| 112. |
*/*_For the transportation of ultrafine particles, the equipment used is a........conveyor.? |
| A. | Belt |
| B. | Pneumatic |
| C. | Screw |
| D. | None of these |
| Answer» C. Screw | |
| 113. |
*/*_Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.? |
| A. | Flight |
| B. | Slat or drag |
| C. | Ribbon |
| D. | Screw |
| Answer» E. | |
| 114. |
*/*_Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)? |
| A. | S |
| B. | 1/R |
| C. | 1/μ |
| D. | All of the above |
| Answer» E. | |
| 115. |
*/*_Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.? |
| A. | Constant rate |
| B. | Varying pressure |
| C. | Varying rate |
| D. | Constant pressure |
| Answer» B. Varying pressure | |
| 116. |
*/*___________ is the most suitable for compounding rubber and plastic solids.? |
| A. | Banbery mixer |
| B. | Pan mixer |
| C. | Pug mill |
| D. | Charge can mixer |
| Answer» B. Pan mixer | |
| 117. |
*/*_Vacuum filter is most suitable for the? |
| A. | Removal of fines from liquid |
| B. | Liquids having high vapour pressure |
| C. | Liquids of very high viscosity |
| D. | None of these |
| Answer» E. | |
| 118. |
*/*_Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).? |
| A. | 6.V/D.S |
| B. | V/6D.S |
| C. | D.S/V |
| D. | V/D.S |
| Answer» B. V/6D.S | |
| 119. |
*/*_Addition of filter aid to the slurry before filtration is done to ...... of the cake.? |
| A. | Increase the porosity |
| B. | Increase the compressibility co-efficient |
| C. | Decrease the porosity |
| D. | Decrease the compressibility co-efficient |
| Answer» B. Increase the compressibility co-efficient | |
| 120. |
*/*_Raw materials are charged in the iron blast furnace using? |
| A. | Bucket elevator |
| B. | Skip hoist |
| C. | Screw conveyor |
| D. | None of these |
| Answer» C. Screw conveyor | |
| 121. |
*/*_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 | |
| 122. |
*/*_Gelatinous solid (which plug the septum) can be filtered by a __________ filter.? |
| A. | Sparkler |
| B. | Plate and frame |
| C. | Vacuum leaf |
| D. | Precoat |
| Answer» E. | |
| 123. |
*/*___________ 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. | |
| 124. |
*/*___________ mill is normally used for grinding of talc.? |
| A. | Tube |
| B. | Compartment |
| C. | Ring-roll |
| D. | Pebble |
| Answer» D. Pebble | |
| 125. |
*/*_Sphericity of pulverised coal is? |
| A. | 1 |
| B. | <1 |
| C. | >1 |
| D. | ‚à û |
| Answer» C. >1 | |
| 126. |
*/*_Which of the following terminology is not used for size reduction of materials to fine sizes or powders?? |
| A. | Comminution |
| B. | Dispersion |
| C. | Pulverisation |
| D. | Compression |
| Answer» E. | |
| 127. |
*/*_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. | Feed material |
| B. | Type of crushing machine |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 128. |
*/*_Angle of nip of the crushing rolls does not depend upon the? |
| A. | Diameter of the rolls |
| B. | Speed of the rolls |
| C. | Product size |
| D. | Feed size |
| Answer» C. Product size | |
| 129. |
*/*_The capacity of a pneumatic conveying system depends upon the? |
| A. | Bulk density of materials |
| B. | Pressure of the conveying air |
| C. | Diameter of the conveying line |
| D. | All of the above |
| Answer» E. | |
| 130. |
*/*_Separation of solid particles based on their densities is called? |
| A. | Sizing |
| B. | Sorting |
| C. | Clarification |
| D. | Dispersion |
| Answer» C. Clarification | |
| 131. |
*/*_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 | |
| 132. |
*/*_Which of the following is not categorised as a "mechanical operation"?? |
| A. | Agitation |
| B. | Filtration |
| C. | Size enlargement |
| D. | Humidification |
| Answer» E. | |
| 133. |
*/*_If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the? |
| A. | Sedimentation |
| B. | Flocculation |
| C. | Dispersion |
| D. | Centrifugation |
| Answer» E. | |
| 134. |
*/*_Pick out the wrong statement pertaining to the roll crushers.? |
| A. | Maximum feed size determines the required roll diameter |
| B. | For hard material's crushing, the reduction ratio should not exceed 4 |
| C. | Both the rolls run necessarily at the same speed |
| D. | Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced |
| Answer» D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced | |
| 135. |
*/*_Limestone is normally crushed in a? |
| A. | Roll crusher |
| B. | Hammer crusher |
| C. | Ball mill |
| D. | Tube mill |
| Answer» C. Ball mill | |
| 136. |
*/*_Gravity stamp mill is meant for the __________ crushing.? |
| A. | Primary |
| B. | Intermediate |
| C. | Fine |
| D. | Ultrafine |
| Answer» D. Ultrafine | |
| 137. |
*/*_Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.? |
| A. | Blake jaw |
| B. | Toothed roll |
| C. | Gyratory |
| D. | None of these |
| Answer» C. Gyratory | |
| 138. |
*/*_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 | |
| 139. |
*/*_Screw conveyors are? |
| A. | Run at very high rpm |
| B. | Suitable for sticky materials |
| C. | Suitable for highly abrasive materials |
| D. | All of the above |
| Answer» C. Suitable for highly abrasive materials | |
| 140. |
*/*_Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.? |
| A. | Apron |
| B. | Belt |
| C. | Screw |
| D. | Flight |
| Answer» B. Belt | |
| 141. |
*/*_If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by? |
| A. | Φs = 6 Vp/dp sp |
| B. | Φs = Vp/dp sp |
| C. | Φs = 6 dp Sp/Vp |
| D. | Φs = dp Sp/Vp |
| Answer» B. ≈í¬∂s = Vp/dp sp | |
| 142. |
*/*_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 | |
| 143. |
*/*_The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is? |
| A. | 6.35 kWh/ton |
| B. | 9.0 kWh/ton |
| C. | 18 kWh/ton |
| D. | 25.4 kWh/ton |
| Answer» D. 25.4 kWh/ton | |
| 144. |
*/*_In case of grinding in a ball mill? |
| A. | Wet grinding achieves a finer product size than dry grinding |
| B. | Its capacity decreases with increasing fineness of the products |
| C. | Grinding cost and power requirement increases with increasing fineness of the products |
| D. | All of the above |
| Answer» E. | |
| 145. |
*/*_Carbon black is pulverised in a? |
| A. | Hammer crusher |
| B. | Ball mill |
| C. | Roll crusher |
| D. | Gyratory crusher |
| Answer» C. Roll crusher | |
| 146. |
*/*_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 | |
| 147. |
*/*_Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.? |
| A. | Jaw crusher |
| B. | Hammer crusher |
| C. | Ball mill |
| D. | Tube mill |
| Answer» C. Ball mill | |
| 148. |
*/*_Chance process is used for the? |
| A. | Cleaning of coal |
| B. | Concentration of iron ore |
| C. | Concentration of pyrites |
| D. | Water treatment |
| Answer» B. Concentration of iron ore | |
| 149. |
*/*_Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?? |
| A. | Parabola |
| B. | Straight line |
| C. | Hyperbola |
| D. | Exponential curve |
| Answer» B. Straight line | |
| 150. |
*/*_Energy requirement (per unit mass of material crushed/ground) is highest for? |
| A. | Jaw crusher |
| B. | Rod mill |
| C. | Ball mill |
| D. | Fluid energy mill |
| Answer» E. | |