Description : The most common packing used in industrial operations is __________ rings. (A) Raschig (B) Lessing (C) Cross-partition (D) Single spiral
Last Answer : (C) Cross-partition
Description : Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) (A) Increases pressure drop, increases surface area (B) Increases pressure drop, decreases ... (C) Decreases pressure drop, increases surface area (D) Decreases pressure drop, decreases surface area
Last Answer : (C) Decreases pressure drop, increases surface area
Description : For raschig rings, the sphericity is (A) 0.5 (B) 1 (C) < 1
Last Answer : (C) < 1
Description : Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? (A) Sphere (B) Cube (C) Cylinder (L/D = 1) (D) Raschig rings
Last Answer : (A) Sphere
Description : Diameter of raschig rings used in packed tower in industry is normally around __________ inches. (A) 2 (B) 8 (C) 12 (D) 18
Last Answer : (A) 2
Description : Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the ... the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow
Last Answer : (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow
Description : Berl saddle made of carbon cannot be used for (A) Alkalis (B) SO2 (C) H2SO4 (D) Oxidising atmosphere
Last Answer : (D) Oxidising atmosphere
Description : When a pall of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is - (1) below a certain minimum value irrespective of amour of water In ... amount of water in the pail (4) below a certain minimum value depending on amount of water in the pail
Last Answer : (2) above a certain minimum value irrespective of amount of water in the pail Explanation: When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when ... to the force of gravity g but also tries to move in a straight line due to its circular motion.
Description : If you had to choose between buying the DVD Rooster Cogburn with john Wayne and Katie Hep, and Mel Brooks' Blazing Saddles, which one would you pick?
Last Answer : I like both movies but will go with Rooster Cogburn. ;0
Description : How do you pick the right Horse saddles?
Last Answer : Choosing the right saddle can be a bit of a challenge dependingon the horse, your location and the type of saddle you wish touse.It is best to get a gullet measurement and find what sizesaddle ... store with knowledgeable employees or a saddler to helpyou find the best saddle for you and your horse.
Description : Monel alloy is (A) The costliest of all the alloys of nickel (B) Not suitable for making kitchen utensils (C) Used for making steam valves and turbine blades as it resists steam attack at high temperature (D) Not used in cast and wrought forms
Last Answer : (C) Used for making steam valves and turbine blades as it resists steam attack at high temperature
Description : Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition? (A) Electrolysis of water (B) Cryogenic removal of H2 from coke oven gas (C) Steam reforming of naphtha (D) Natural gas cracking
Last Answer : (A) Electrolysis of water
Description : Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis? (A) H2 separation from coke oven ga (B) Steam reforming of naphtha (C) Cracking of natural gas (D) Electrolysis of water
Last Answer : (D) Electrolysis of water
Description : Which of the following is the costliest material of construction used in pressure vessel construction? (A) Low alloy steel (B) Lead (C) Titanium (D) High alloy steel
Last Answer : (C) Titanium
Description : Which of the following is the costliest source of getting hydrogen on commercial scale for the manufacture of nitrogenous fertiliser? (A) Coal gasification (B) Steam reforming of naphtha (C) Electrolysis of water (D) Coke oven gas
Last Answer : (C) Electrolysis of water
Description : Sphericity of raschig ring (whose length and diameter are equal) is (A) > 1 (B) < 1 (C) 1 (D) 2
Last Answer : (C) 1
Description : Diameter to height ratio for a raschig ring is (A) 1 (B) 0.5 (C) 2 (D) 8
Last Answer : (A) 1
Description : Raschig ring made of porcelain cannot be used for treating concentrated (A) Hydrochloric acid (B) Nitric acid (C) Alkalis (D) Sulphuric acid
Last Answer : (C) Alkalis
Description : Ceramic materials are (A) Organic in nature (B) Stronger in compression than in tension (C) Always amorphous in nature (D) Always bad heat conductors
Last Answer : (B) Stronger in compression than in tension
Description : Ceramic materials (A) Are exemplified by clay and mica (B) Are poor electrical conductors due to lack of free electrons (C) Never exhibit polymorphism (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Ceramic materials fabrication cannot be done by (A) Welding (B) Slip casting (C) Extrusion (D) Plastic pressing
Last Answer : (A) Welding
Description : Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material? (A) Slag cement (B) Glasses (C) Porcelain/Potteries (D) Teflon
Last Answer : (D) Teflon
Description : Viscoelastic behaviour is observed in __________ materials. (A) Non-crystalline organic polymeric (B) Ceramic (C) All crystalline (D) All amorphous
Last Answer : Non-crystalline organic polymeric
Description : Are there packing crates made of indistructable materials?
Last Answer : There are other ways to ship fragile glass items. The company Bullseye Class Co. (.bullseyeglass.com)specializes in containers designed for the safe shipping of glass. You can also find plastic shipping crates at plasticshippingcrates.com.
Description : Which is the world's costliest car ? -Do You Know?
Last Answer : Bugatti La Voiture Noire Bugatti La Voiture Noire: $18.68 million or Rs 132 crore Bugatti takes home the trophy for the most expensive car in the world. Making its debut a year ago at the Geneva International Motor Show, the one-of-a-kind La Voiture Noire is priced at $18.68 million.
Description : Economic saving of time results by crashing (A) Cheapest critical activity (B) Cheapest noncritical activity (C) Costliest critical activity (D) Costliest noncritical activity
Last Answer : (A) Cheapest critical activity
Description : Which braking system on the locomotives is the costliest among the following? A) Vacuum braking on diesel locomotives B) Vacuum braking on steam locomotives C) Regenerative braking on electric locomotives D) All braking systems are equally costly
Last Answer : Which braking system on the locomotives is the costliest among the following? A) Vacuum braking on diesel locomotives B) Vacuum braking on steam locomotives C) Regenerative braking on electric locomotives D) All braking systems are equally costly
Description : Why is glazing used to make ceramic materials ?
Last Answer : A mixture of ceramic materials is molded into a specific molding of the crossing and after drying in hot air, it is burned and turned into perforated burnt ceramic material or biscuits. In this ... . into a thin glass material. Glazing closes the pores on the surface of the material biscuits.
Description : Cracking of ceramic articles can be controlled by non-clay materials like
Last Answer : flint/quartz.
Description : Give reason: Unglazed ceramic materials are used in water filters.
Last Answer : Unglazed ceramic materials use the small pores to filter dirt, debris and bacteria out of water.
Description : Ceramic materials possess which of the following properties? a) Brittle and low dielectric constant b) Rigid and low dielectric constant c) Brittle and high dielectric constant d) Rigid and high dielectric constant
Last Answer : c) Brittle and high dielectric constant
Description : Give properties and uses of ceramic materials in construction.
Last Answer : Properties: 1. It is hard. 2. It is bristle. 3. It is in the form of amorphous (non-crystalline) 4. The structure is glassy. 5. It is insulator thermally & electrically. 6. It is ... porcelain. 6. For making POP. 7. For making electric. 8. For Manufacturing of sanitary wares, pavers.
Description : Which of the following physical properties is TRUE of most dense ceramic materials? w) high tensile strength x) good ductility y) high compressive strength z) high electrical conductivity
Last Answer : ANSWER: Y -- HIGH COMPRESSIVE STRENGTH
Description : Write four properties of Ceramic Materials and give it’s applications in automobile industry.
Last Answer : Properties of Ceramic Material: i. Inorganic & non -metallic material. ii. Brittle material. iii. Insulation to flow of electric current iv. Withstand high temperature. v. Rock like appearance vi. Hardness ... mica etc. 7. In I.C. engines and turbines as armor plates. 8. In cutting tools
Description : Which of the following materials is recommended for finishing the slip rings after grinding or turning? A. grade 00 sandpaper B. canvas wiper C. crocus cloth D. smooth file
Last Answer : Answer: C
Description : What are the materials used to manufacture the brushes for slip rings of an induction motor?
Last Answer : A:The slip rings are made of brass and phosphor bronze. The brushes are made of metal graphite which is an alloy of copper and carbon.
Description : Practical method of improving string efficiency a) Increasing crass arms length b) Using different size of insulators c) Using different insulator materials d) Using of guard rings
Last Answer : Ans: Increasing crass arms length*
Description : Branched chain polymers compared to linear polymers have higher (A) Density (B) Tensile strength (C) Melting point (D) Degree of irregularity in atomic packing
Last Answer : (D) Degree of irregularity in atomic packing
Description : Thermocol (expanded polystyrene) is not used for (A) Low temperature thermal insulation as in refrigerator and air conditioners (B) Acoustic control and ceiling for building (C) High temperature thermal insulation in furnaces (D) Packing of delicate electronic gadgets
Last Answer : (C) High temperature thermal insulation in furnaces
Description : Tin in its pure form is used for making (A) Cans for food packing (B) Collapsible tubes for toilet preparations (C) Foil for wrapping cheese (D) All (A), (B) and (C)
Description : In SO3 absorber (Contact Process), packing material used is of (A) Cast iron (B) Chemical stoneware (C) Karbate (D) Mild steel
Last Answer : (B) Chemical stoneware
Description : In an absorber, HETP does not vary with the (A) Flow rate of liquid (B) Flow rate of gas (C) Type and size of packing (D) None of these
Last Answer : (D) None of these
Description : An ideal tower packing should not (A) Have low weight per unit volume (B) Have large surface area per unit volume (C) Have large free cross-section (D) Hold up large amount of liquid in the packing
Last Answer : (D) Hold up large amount of liquid in the packing
Description : Channelling in a packed tower results from the (A) High pressure drop (B) Maldistribution of liquid (C) Non-uniformity of packing (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Which of these columns incurs the lowest pressure drop? (A) Packed column (with stacked packing) (B) Packed column (with dumped packing) (C) Bubble plate column (D) Pulse column
Last Answer : (A) Packed column (with stacked packing)
Description : Stacked packing compared to dumped packing (A) Provides poorer contact between the fluids (B) Gives lower pressure drop (C) Both (A) and (B) (D) Gives higher pressure drop
Last Answer : (C) Both (A) and (B)
Description : In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter (A) > 4 :1 (B) < 8 : 1 (C) > 8:1 (D) < 6:1
Last Answer : (C) > 8:1
Description : Channelling is most severe (A) In towers packed with stacked packing (B) In towers packed randomly with crushed solids (C) In dumped packing of regular units
Last Answer : (A) In towers packed with stacked packing
Description : Pick out the wrong statement. (A) Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the ... of liquid, problem of channelling, loading & flooding is generally encountered in packed towers
Last Answer : (C) Diameter of randomly packed tower is normally more than 1.2 metres
Description : Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the ... C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these
Last Answer : (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments