Description : Advantages of fluidised bed combustion are (A) Reduced NOx formation in flue gas (B) Lower furnace operating temperature (C) High heat transfer rate (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these
Last Answer : (D) None of these
Description : In Drum type Boiler Feed water flow control by Three element controller a. Drum level b. Steam Flow c. Feed water flow d. All of above
Last Answer : Ans:- d. All of above
Description : Explain the working of La-mont boiler
Last Answer : La-mont boiler: Working: The La-mont boiler consists Boiler shell, combustion chamber, evaporator, economizer, circulating pump, super heater, and steam drum. This is modern high ... drawn through the super heater. The superheated steam so obtained is then supplied to the prime mover.
Description : Draw neat and labeled sketch of three pass packages type boiler.
Last Answer : Each set of tubes that hot combustion flue gas travels through before making a turn within the boiler, is considered a "pass." A 3-pass fire tube boiler design consists of three sets of ... design that allows more heat transfer time to deliver the same or higher efficiency rating.
Description : The advantage of firing pulverised coal in the furnace lies in the fact, that it (A) Permits the use of high ash content coal (B) Permits the use of low fusion point ash coal (C) Accelerates the burning rate and economises on fuel combustion (D) All (A), (B) and (C)
Last Answer : (C) Accelerates the burning rate and economises on fuel combustion
Description : Because less coal is consumed in this system, emissions of ______ and particulate and solid waste by products are reduced. a. Sulphur dioxide (SO2) b. Nitrogen oxide (NOx) c. Carbon dioxide (CO2) d. All of the above.
Last Answer : d. All of the above.
Description : Draw P-V and T-S diagram of dual combustion cycle.
Last Answer : Dual combustion cycle: 1-2 Isentropic compression of air 2-3 the combustion of fuel at constant volume. 3-4 the combustion of fuel at constant pressure 4-5 Isentropic expansion during which work is done by the system. 5-1 Heat rejection at constant volume.
Description : Explain combustion chemistry of carbon, hydrogen and methane.
Last Answer : Combustion chemistry of carbon, methane and hydrogen: i) Carbon: Burning of carbon to carbon dioxide ( complete combustion ) That means 1 kg of carbon needs 2.67 kg oxygen and produces 3.67 ... equitation 1 kg of hydrogen combines with 8 kg of oxygen to produce 9 kg of steam.
Description : Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly ash discharge from the stack (C) Higher power consumption in its transportation (D) Erosion of induced draft fan blades
Last Answer : (A) Ash disposal problem
Description : Which of the following fuels is generally not used in thermal power plant boiler firing? (A) Furnace oil, light diesel oil and tar/PCM (B) Pulverised coking coal (C) Coal middling from washeries (D) B.F. gas, coke oven gas and L.D. converter gas
Last Answer : (B) Pulverised coking coal
Description : Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly-ash discharge from the stack (C) High power consumption in its transportation (D) Erosion of induced draft fan blades
Description : Pulverised coal used in boiler firing need not have (A) Less moisture content (B) High fusion point of its ash (C) High bulk density (D) Lower ash conten
Last Answer : (B) High fusion point of its ash
Description : How can noise be reduced?
Last Answer : In order to be able to reduce disturbing noise levels, it is very important to identify two key elements. The first element is the source of the noise. The second is the frequency of the noise. Typically a vibration mount designed in accordance with vibration.
Description : The growth of SSI up to____: a. 100 device on a chip b. 200 device on a chip c. 300 device on a chip d. 400 device on a chip
Last Answer : a. 100 device on a chip
Description : The function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil
Last Answer : (A) Feedwater
Description : Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the (A) Physical nature, ash content and fineness of the coal (B) Amount of excess air supplied and load on the boiler (C) Type of burner and combustion chamber (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of (A) Transportation of coal (B) Drying of coal (C) Combustion of coal by supplying it around the burner (D) Preheating the primary air
Last Answer : (C) Combustion of coal by supplying it around the burner
Description : Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the (A) ... chamber (B) Risk of explosion (C) Chances of clinker formation (D) Incomplete combustion of coal
Last Answer : (B) Risk of explosion
Description : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Description : Use of pulverised coal in boiler furnace provides (A) High calorific value (B) Better combustion (C) Smokeless burning (D) Less erosion on furnace walls
Last Answer : (B) Better combustion
Description : Coal is pulverised before burning in large capacity boiler furnaces mainly to (A) Ensure its complete combustion (B) Facilitate easy ash removal (C) Enhance its calorific value (D) Provide trouble free operation
Last Answer : (A) Ensure its complete combustion
Description : Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above
Last Answer : 4. All of above
Description : Which of the following is the combustion accessory of a boiler? • Fuel oil system • Gas system • Coal system • All of the above
Last Answer : • All of the above
Description : (3) Oxides of nitrogen and sulphur Explanation: Acid rain is caused by emissions of oxides of Sulfur and Nitrogen (Sulfur Dioxide and Nitrogen Oxide), which react with the water molecules in the ... The emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) result from fossil fuel combustion.
Last Answer : (3) live wire and the neutral wire Explanation: Three wires enter most homes from the power pole-two "hot" wires and a third "neutral" wire. Each hot wire provides 120- volt current for ... the main switch is put off because the electric circuit (the path where the electricity travels) gets opened.
Description : Illustrate with neat sketch the process to control production of NOx in combustion chamber.
Last Answer : Method to control NOx: The EGR system is used to reduce the amount of NOx in the exhaust. NOx production increases as the temperature inside the combustion chamber rises due to acceleration or heavy engine loads, ... (less than 10% of total) to be supplied into the incoming air: fuel mixture.
Description : Fluther engineers, can you reproduce the technology in an food assembly line?
Last Answer : answer:If the world collapses there will be bigger problems than restoring food processing and packaging on assembly lines. One of the bigger problems will be finding people willing to raise food crops ... not going to be one of the first industries to re-emerge from a collapse of civilization.
Description : What is the best university to approach with a reasearch idea involving theoretical solar technology?
Last Answer : M.I.T.?
Description : The major limitation of metallic recuperated is ------- a) Limitation of handling COx, NOx etc. b) Limitation of reduced life for handling temperature more than 1000 oC c) Manufacturing difficulty of the required design d) None of the above
Last Answer : Limitation of reduced life for handling temperature more than 1000 oC
Description : In a coal fired power plant electrostatic precipitators are installed to control emission of (a) NOX (b) SPM (c) CO (d) SO2
Last Answer : (b) SPM
Description : The advantages of firing pulverised coal in the furnace lies in the fact that, it (A) Permits the use of high ash content coal (B) Permits the use of low fusion point ash coal (C) Accelerates the burning rate and economises on fuel consumption (D) All (A), (B) and (C)
Last Answer : (C) Accelerates the burning rate and economises on fuel consumption
Description : Why boiler is purged everytime before starting firing of fuel ?
Last Answer : Purging ensures that any unburnt fuel in furnace is removed, otherwise it may lead to explosion.
Description : In the autonomic regulation of blood pressure (a) Cardiac output is maintained constant at the expense of other hemodynamic variables (b) Elevation of blood pressure results in elevated ... the sensitivity of the sensory baroreceptor nerve endings might cause an increase in sympathetic discharge
Last Answer : Ans: D
Description : Please ripley me due to emergency
Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.
Description : Is not asked
Last Answer : In manual feed turning, the operator manually controls the feed rate of the cutting tool by turning a handwheel or other manual feed mechanism. This allows the operator to adjust the feed rate ... hand, is generally faster and more consistent, but it requires more complex equipment and programming.
Description : Can a Schizophrenic study Engineering?
Last Answer : You can ask the university’s disability counselor. You might get an accommodation as a special student or take fewer classes, and go part time. Congratulations on improving your situation.
Description : Mechanical engineers: how should one think about using an electric motor actuator vs a hydraulic actuator powered by an electric pump?
Last Answer : Too much wear on gears (and they would have to be huge), much more power advantage with hydraulics. Less parts. And more cost effective. And take up less space.
Description : How long is the longest rope ever manufactured?
Description : Is it clear what a flying car is from the images in the following page?
Last Answer : Yeah. Why? And, I don’t know. If you’ve seen the ‘Blade Runner’, and some other science fictions series and films, it just looks neat. But I doubt we’ll have much of those things until the relatively distant future… if then.
Description : Does anyone have advice about building a new pole barn on my property?
Last Answer : So you intend to keep the current concrete floor?
Description : Do the new digital thermometers stay in your mouth when you use them?
Last Answer : They pop out of my mouth too. Yes, they need redesigned. I went back to the old fashion thermometers with mercury.
Description : Which College is best for Marine Engineering?
Last Answer : The Merchant Marine Academy
Description : Why is engineering so hard to get into?
Last Answer : Because even top students flunk out. If you don’t have “the knack” and good academic discipline then understanding the core curriculum simply will not happen. It’s no picnic, it’s more like the revenant.
Description : Where do you find buildings that are both earthquake proof as well as flood proof?
Last Answer : California.
Description : What is computer engineering like when compared to working at McDonalds?
Last Answer : answer:McDonalds you just take shit from your boss, and from customers while working a shit wage. My buddy describes his engineering job like hanging out in the college library working out a problem. ... those who feel their skills makes them a better human being/deserving of a higher wage.
Description : What types of non-physics/math based engineers are there?
Last Answer : Choo-choo train. You get to choose your scale rather than your degree.
Description : How can I introduce teaching code to my soon to be 2 year old son?
Last Answer : Building with blocks, making mud pies, playing with Thomas the Tank Engine and making the tracks fit. Don’t worry about specific skill preparation; all creative play is good. Your son might decide he wants to be a ballerina!
Description : What is the max square feet or cubic feet for residential air conditioners?
Last Answer : JLeslie This Link seems to keep is simple and I like that it is tabled by temp zones.
Description : What calculator do engineers use?
Last Answer : pen and paper, yeaaaaaah