MCQOPTIONS
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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.
| 6001. |
A hardened steel essentially contains |
| A. | sorbite |
| B. | troostite |
| C. | martensite |
| D. | none of these |
| Answer» D. none of these | |
| 6002. |
The range of Mho's scale of hardness is from |
| A. | l to l5 |
| B. | l to 8 |
| C. | l to10 |
| D. | 0 to 10 |
| Answer» D. 0 to 10 | |
| 6003. |
Which of the following pairs of elements may form an alloy ? |
| A. | Iron & carbon |
| B. | Iron & mercury |
| C. | Platinum & mercury |
| D. | None of these |
| Answer» B. Iron & mercury | |
| 6004. |
SO3 is absorbed using H2SO4 in a |
| A. | cast iron packed tower. |
| B. | stainless steel plate tower. |
| C. | packed steel tower lined with acid proof bricks. |
| D. | none of these. |
| Answer» D. none of these. | |
| 6005. |
Carbon percentage in medium carbon steel is around |
| A. | 0.1 to 0.35 |
| B. | 0.35 to 0.5 |
| C. | 0.8 to 1.4 |
| D. | 1 to 1. 5 |
| Answer» C. 0.8 to 1.4 | |
| 6006. |
The preferred material of construction for storage tanks for 98% sulphuric acid is |
| A. | aluminium |
| B. | lead |
| C. | stainless steel 316 |
| D. | mild steel |
| Answer» C. stainless steel 316 | |
| 6007. |
The filtrate flow rate in constant pressure filtration |
| A. | continuously increases. |
| B. | continuously decreases. |
| C. | remains constant throughout. |
| D. | may increase or decrease ; depends on the pressure. |
| Answer» C. remains constant throughout. | |
| 6008. |
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of |
| A. | electromagnets |
| B. | cams or eccentric shafts |
| C. | unblanced fly wheels |
| D. | either (a), (b) or (c). |
| Answer» E. | |
| 6009. |
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow. |
| A. | plug |
| B. | turbulent |
| C. | laminar |
| D. | none of these |
| Answer» D. none of these | |
| 6010. |
Which of the following is a batch sedimentation equipment ? |
| A. | Dust catcher |
| B. | Filter thickener |
| C. | Dry cyclone separator |
| D. | Rotary sprayer scrubber. |
| Answer» C. Dry cyclone separator | |
| 6011. |
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 | |
| 6012. |
Which of the following is not used as filter aid? |
| A. | Asbestos |
| B. | Diatomaceous earth |
| C. | Purified wood cellulose |
| D. | Rice husk |
| Answer» E. | |
| 6013. |
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 | |
| 6014. |
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced. |
| A. | concentrate |
| B. | tailing |
| C. | middling |
| D. | none of these. |
| Answer» D. none of these. | |
| 6015. |
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ? |
| A. | Wet grinding in low viscous suspension. |
| B. | Wet grinding in high viscous suspension. |
| C. | Dry grinding of large particles (upto 1.25 cms). |
| D. | Dry grindng of large particles in un-baffed mills. |
| Answer» E. | |
| 6016. |
Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface. |
| A. | plane |
| B. | curved |
| C. | ribbed |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 6017. |
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 | |
| 6018. |
A filter press is |
| A. | a batch filter. |
| B. | not suitable, if the liquid is the main product. |
| C. | having prohibitively high maintenance cost. |
| D. | not suitable for wide range of materials under varying operating conditions of cake thickness and pressure. |
| Answer» B. not suitable, if the liquid is the main product. | |
| 6019. |
Xanthates are used in the froth floatation process as a/an |
| A. | conditioner |
| B. | frother |
| C. | collector |
| D. | activator |
| Answer» D. activator | |
| 6020. |
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is |
| A. | 2 |
| B. | <span class="root">2 </span> |
| C. | 1.5 |
| D. | <span class="root">3 </span> |
| Answer» C. 1.5 | |
| 6021. |
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. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-135-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-135-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-135-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/mechanical-operations/106-135-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/mechanical-operations/106-135-2.png"> | |
| 6022. |
Babbit metals used for making bearings are |
| A. | tin or lead based alloys. |
| B. | short of antifrictional properties. |
| C. | having homogenous microstructure. |
| D. | yellow metals. |
| Answer» B. short of antifrictional properties. | |
| 6023. |
Pipes for bi-cycle frames are made of __________ steel. |
| A. | hot rolled |
| B. | chrome carbon |
| C. | cold rolled |
| D. | stainless |
| Answer» D. stainless | |
| 6024. |
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40 C ? |
| A. | Silicone rubber, teflon, procelain and wood. |
| B. | Nickel, monel, stainless steel and graphite. |
| C. | Aluminium, copper, high silicon iron. |
| D. | Brass, cast iron, mild steel and tin. |
| Answer» E. | |
| 6025. |
Interchain forces are the weakest in case of |
| A. | plastics |
| B. | fibres |
| C. | elastomers |
| D. | both rubber & elastomers |
| Answer» E. | |
| 6026. |
__________ possesses viscoelastic properties. |
| A. | Cork |
| B. | Glass |
| C. | Graphite |
| D. | Rubber |
| Answer» E. | |
| 6027. |
Sphericity of raschig ring (whose length and diameter are equal) is |
| A. | >1 |
| B. | <1 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 6028. |
Mixing mechanism employed in a pan mixer is by |
| A. | mulling |
| B. | kneading |
| C. | dispersion |
| D. | none of these |
| Answer» B. kneading | |
| 6029. |
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. | |
| 6030. |
Which of the following screens has the maximum capacity ? |
| A. | Grizzlies |
| B. | Trommels |
| C. | Shaking screen |
| D. | Vibrating screen |
| Answer» E. | |
| 6031. |
Stamp mills are generally used for crushing |
| A. | iron ores |
| B. | gold ores |
| C. | talc |
| D. | diamond |
| Answer» C. talc | |
| 6032. |
Screen efficiency is |
| A. | recovery/rejection |
| B. | recovery |
| C. | rejection |
| D. | none of these |
| Answer» E. | |
| 6033. |
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a |
| A. | Buhrstone mill |
| B. | ball mill |
| C. | crushing rolls |
| D. | hammer mill |
| Answer» B. ball mill | |
| 6034. |
Handling of ashes and similar materials can be done best by a __________ conveyor. |
| A. | flight |
| B. | drag or slat |
| C. | belt |
| D. | ribbon. |
| Answer» C. belt | |
| 6035. |
Which of the following must be stored in silos and not in open yard ? |
| A. | Coke breeze |
| B. | High V.M. bituminous coal |
| C. | Sand |
| D. | None of these |
| Answer» C. Sand | |
| 6036. |
Separation of solid particles based on their densities is called |
| A. | sizing |
| B. | sorting |
| C. | clarification |
| D. | dispersion |
| Answer» C. clarification | |
| 6037. |
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? |
| A. | Cresylic acid |
| B. | Copper sulphate |
| C. | Calcium carbonate |
| D. | Sodium carbonate |
| Answer» C. Calcium carbonate | |
| 6038. |
Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size. |
| A. | 0.2 to 0.8 |
| B. | 5 to 25 |
| C. | 50 to 100 |
| D. | 100 to 250 |
| Answer» B. 5 to 25 | |
| 6039. |
Cumulative analysis for determining surface is more precise than differential analysis, because of the |
| A. | assumption that all particles in a single fraction are equal in size. |
| B. | fact that screening is more effective. |
| C. | assumption that all particles in a single fraction are equal in size, is not needed. |
| D. | none of these. |
| Answer» D. none of these. | |
| 6040. |
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. | |
| 6041. |
Screw conveyors are |
| A. | run at very high rpm. |
| B. | suitable for sticky materials. |
| C. | suitable for highly abrasive materials. |
| D. | all (a), (b) and (c) |
| Answer» C. suitable for highly abrasive materials. | |
| 6042. |
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. | |
| 6043. |
The energy consumed by a ball mill depends on |
| A. | its speed. |
| B. | its ball load. |
| C. | the density of the material being ground. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 6044. |
Energy consumption in a crusher decreases with increase in the |
| A. | size of the product (at constant feed size). |
| B. | capacity of the crushing machine. |
| C. | size of feed (at constant reduction ratio). |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 6045. |
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 | |
| 6046. |
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 | |
| 6047. |
Cake resistance is |
| A. | important in the beginning of filtration. |
| B. | decreased with the time of filtration. |
| C. | independent of pressure drop. |
| D. | none of these. |
| Answer» E. | |
| 6048. |
In paint industries, blending of light paste is done by using a |
| A. | masticator |
| B. | charge can mixer |
| C. | kneader |
| D. | none of these |
| Answer» C. kneader | |
| 6049. |
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. | 0.58 |
| C. | 0.68 |
| D. | 0.62 |
| Answer» B. 0.58 | |
| 6050. |
__________ is used for producing a thick suspension from a thin slurry. |
| A. | Cartridge filter |
| B. | Rotary drum vacuum filter |
| C. | Pressure filter thickener |
| D. | Plate and frame filter press |
| Answer» D. Plate and frame filter press | |