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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

201.

Which calorific value is same as the thermodynamic heat of combustion?(a) Net calorific value(b) Flash point value(c) Gross calorific value(d) Fire point valueThe question was asked by my school principal while I was bunking the class.I'd like to ask this question from Calorific Value of Fuels in section Steam Power Plant of Energy Engineering

Answer»

Right choice is (d) Fire point value

Easy explanation: Gross calorific value is as same as the thermodynamic heat of COMBUSTION SINCE the enthalpy change for the reaction assumes a common temperature of the compounds before and after combustion, in which case the WATER PRODUCED by combustion is condensed to a liquid, HENCE yielding its latent heat of vaporization.

202.

Which gas has the highest calorific value among given option?(a) Oxygen(b) Helium(c) Hydrogen(d) NitrogenThe question was asked in my homework.I want to ask this question from Calorific Value of Fuels topic in division Steam Power Plant of Energy Engineering

Answer»

The correct choice is (C) HYDROGEN

For explanation I would say: Hydrogen gas has the highest calorific value of 150KJ/g among all. So, hydrogen gas is CONSIDERED is considered to be an extremely good fuel. However, hydrogen gas is not used as a fuel in homes and INDUSTRIES. Reason is hydrogen is highly combustible and it burns with explosion when lighted, its transportation from place to place is very difficult, and the cost of production of hydrogen is very HIGH.

203.

Which two nuclear fuels are produced artificially?(a) 92Pu^239 and 92U^233(b) 92Pu^244 and 92U^234(c) 92Pu^241 and 92U^235(d) 92Pu^242 and 92U^236I got this question in quiz.The origin of the question is Gaseous Fuels & Nuclear Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

Right choice is (a) 92Pu^239 and 92U^233

The EXPLANATION is: PLUTONIUM 92Pu^239 and URANIUM 92U^233 are the FISSIONABLE materials produced artificially from 92U^238 and 90Th^232 respectively. Uranium-238 and thorium 232 are available in nature. They are known as fertile materials. These fertile materials when placed close to 92U^235 in a reactor absorb the emitted NEUTRONS to produce fissionable materials as follows.

204.

Which among the following fuels need excess amount of air for complete combustion?(a) Natural fuels(b) Liquid fuels(c) Gaseous fuels(d) Artificial solid fuelsI got this question by my school teacher while I was bunking the class.This interesting question is from Artificial Solid Fuels & Liquid Fuels in division Steam Power Plant of Energy Engineering

Answer»

Correct answer is (d) Artificial solid fuels

Explanation: Artificial solid fuels need excess AMOUNT of AIR for complete combustion because they have low calorific value COMPARED to liquid fuels and the rate of combustion of solid fuels cannot be easily controlled. They have tendency to FORM clinkers at high TEMPERATURES.

205.

Which fuel has the lightest liquid petroleum fraction?(a) Diesel(b) Petrol(c) Distillate(d) KeroseneThe question was asked in an interview for internship.I'm obligated to ask this question of Artificial Solid Fuels & Liquid Fuels topic in section Steam Power Plant of Energy Engineering

Answer» RIGHT choice is (b) PETROL

To explain I would say: Petrol has the lightest LIQUID petroleum fraction and highly volatile in nature. It is also called GASOLINE. It has a specific GRAVITY ranging from 0.70 to 0.78. It is obtained between 65 to 200^oC and it is a mixture of a number of hydrocarbons. It is light yellow in color and it is used as a fuel in automobiles and aero planes.
206.

Which fuel is partially carbonized and is considered as a primary stage in coal formation?(a) Coal bitumen(b) Anthracite(c) Peat(d) LigniteThis question was posed to me during an online exam.I'd like to ask this question from Types of Fuels in portion Steam Power Plant of Energy Engineering

Answer»

The correct choice is (c) Peat

Best explanation: Peat is partially carbonized and DECOMPOSED MATERIAL formed mainly due the transformation of buried vegetation. It is considered as the primary stage in the formation of the coal. It is spongy substance with high moisture content (upto 80%). Hence it has to be dried before use. In DRY FORM, it has a calorific value of about 14560 KJ/kg. It consists of 58% C; 6.3% H2; 30.8% O2; 0.9% N2 and 4% ash.

207.

Which fuel is produced by slow pyrolysis?(a) Dung cake(b) Coke(c) Charcoal(d) BriquetteThe question was asked in a national level competition.I need to ask this question from Artificial Solid Fuels & Liquid Fuels in section Steam Power Plant of Energy Engineering

Answer»

The correct choice is (c) Charcoal

The best I can explain: Charcoal is produced by slow pyrolysis. It is prepared by heating wood with limited SUPPLY of air below 280°C. It contains 80-90% of carbon. It is used for domestic PURPOSE namely COOKING, heating and metallurgical purpose. Charcoal is the light weight black carbon and ash residue produced by removing water and other volatile constituents from animal and vegetation SUBSTANCES. There are different types of coal namely sugar charcoal, activated charcoal, lump charcoal, etc.

208.

Which fuel is the final stage in the formation of coal?(a) Bituminous coal(b) Anthracite coal(c) Peat(d) LigniteThe question was posed to me in unit test.Enquiry is from Types of Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

Right option is (b) Anthracite COAL

The EXPLANATION: Anthracite coal is CALLED final stage of transformation of buried vegetation into coal. It is non-caking and has HIGHEST calorific value of about 35500 kJ/kg. It burns at high temperature and is smokeless. It consists of 91% C; 3% H2; 2.5% O2; 0.5% N2; 0.5% S and 2.5% ash. It is also used as a boiler fuel.

209.

By what means the power in the steam power plant is developed?(a) Condenser(b) Electric power system(c) Prime mover(d) EconomizerThis question was posed to me in a national level competition.Question is from Feed Water and Steam Generation System, Working of Thermal Power Plant in division Steam Power Plant of Energy Engineering

Answer»

Correct CHOICE is (c) Prime mover

Easy EXPLANATION: The prime move s used to develop power in the steam power plant. The water is HEATED, turns into steam and is made to enter into steam turbine. The steam spins and it drives electric generator CONNECTED to it, which generates ELECTRICITY.

210.

In what aspect does the nozzle make changes?(a) Temperature(b) Volume(c) Pressure(d) DensityI had been asked this question in an international level competition.This intriguing question originated from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in portion Steam Power Plant of Energy Engineering

Answer»

The correct choice is (c) Pressure

Explanation: Nozzle makes changes in terms of pressure VARIATION. And rest all factors/terms are unaffected. By decreasing the pressure and increasing the VELOCITY at other end through convergent-divergent nozzle, the required force or pace can be ACHIEVED to run the BLADES of turbine.

211.

Feed water from the hot well is supplied to steam generator by using the _________(a) Sewers(b) Cistern(c) Water trough(d) Feed pumpI had been asked this question during a job interview.Enquiry is from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in chapter Steam Power Plant of Energy Engineering

Answer»

The CORRECT OPTION is (d) Feed pump

Best explanation: Feed pump is used to pump/supply feed water from hot wall to steam GENERATOR. The water MAY be freshly supplied or returned CONDENSATE produced by the boiler. These pumps are positive displacement generator and are of very high capacity.

212.

Which fuel has higher thermodynamic efficiency in liquid fuels?(a) Diesel(b) Petrol(c) Kerosene(d) LPGI got this question in exam.Asked question is from Artificial Solid Fuels & Liquid Fuels in chapter Steam Power Plant of Energy Engineering

Answer» RIGHT choice is (a) Diesel

For explanation: Diesel is heavier than kerosene. It has SPECIFIC gravity ranging from 0.86 to 0.95. It is obtained between 200 to 370^oC. It is USED in diesel engine. Diesel engines have found broad use as a result of HIGHER thermodynamic efficiency and fuel efficiency.
213.

How flue gas is made use of in steam power plant?(a) To maintain the constant pressure inside boiler(b) To heat the water in the tubes of boiler(c) To increase or decrease the pressure inside the boiler(d) To remove all unnecessary chemical constituentsThis question was posed to me during an online interview.Question is taken from Cooling Water System, Air & Fuel Gas System in division Steam Power Plant of Energy Engineering

Answer»

Correct answer is (b) To heat the WATER in the TUBES of boiler

For explanation I would say: The flue GASES are circulated in the furnace to heat the water in tubes. First it is PASSED over economizer and then to the pre-heater. And then finally after MAKING maximum utilization of the flue gas they are exhausted through chimneys.

214.

On what factors does hydel plant entirely depend?(a) Vegetation(b) Tropical cycle(c) Amount of Rainfall(d) Hydrological cycleThis question was addressed to me in homework.Asked question is from Necessity of a Steam Plant in chapter Steam Power Plant of Energy Engineering

Answer»

The correct choice is (d) Hydrological CYCLE

For explanation: Hydrological cycle is an explanation of the continuous movement of water above and below earth surface, where as rainfall is not reliable SINCE it varies PERIOD to period. The AMOUNT of water above the earth surface and below the earth surface, both are responsible for the hydrological cycle. ‘Vegetation’ is info about the ASSEMBLAGE of plant species irrespective of their geographic characteristics.

215.

Which fuel has higher calorific value among given fuels?(a) Natural gas(b) Gasoline(c) Diesel(d) Fuel oilI got this question in an online quiz.Enquiry is from Calorific Value of Fuels in portion Steam Power Plant of Energy Engineering

Answer»

Correct ANSWER is (b) Gasoline

The best explanation: Gasoline also called as petrol, has the highest calorific value. Gasoline is a transparent petroleum derived liquid that is used PRIMARILY as a fuel in internal combustion ENGINES. It consists of mostly of organic compounds obtained by the fractional DISTILLATION of petroleum, ENHANCED with variety of additives.

216.

Lower calorific value can be determined by equation:(a) LCV = HCV – m*2466(b) LCV = HCV + (m/2466)(c) LCV = HCV – (m/2466)(d) LCV = HCV + (m*2466)This question was addressed to me in an interview for job.This question is from Calorific Value of Fuels in section Steam Power Plant of Energy Engineering

Answer»
217.

Which value is determined by subtracting the heat of vaporization of the water from the higher heating value?(a) Gross calorific value(b) Net calorific value(c) Ignition temperature(d) Fire point temperatureI got this question in a national level competition.My query is from Calorific Value of Fuels topic in division Steam Power Plant of Energy Engineering

Answer»

The CORRECT CHOICE is (B) Net calorific value

Explanation: Net calorific value determined. In most of the combustion processes, the products of combustion cannot be cooled to its initial temperature. Thus water vapors don’t condense and hence the latent heat of water vapor is lost to the atmosphere. The resultant heat liberated by the fuel which EXCLUDES the latent heat of evaporation of water vapors is known as lower calorific value of fuel.

218.

How much percent of hydrogen gas does methane contain?(a) 25%(b) 50%(c) 68%(d) 85%I got this question in a national level competition.Question is from Calorific Value of Fuels topic in portion Steam Power Plant of Energy Engineering

Answer»

Correct answer is (a) 25%

For EXPLANATION I would say: Methane contains 25% of hydrogen. Since the calorific VALUE of FUELS DEPENDS on the percentage of hydrogen present in them. So the fuels which have higher percentage of hydrogen will have higher calorific value as compared to those fuels which have lower percentage of hydrogen.

219.

What is the factor on which, difference between the two heating values of fuel depends on?(a) Physical properties(b) Reactants(c) Chemical composition(d) ProductsThis question was addressed to me in an internship interview.I'm obligated to ask this question of Calorific Value of Fuels in section Steam Power Plant of Energy Engineering

Answer»

Right answer is (c) CHEMICAL composition

To elaborate: The DIFFERENCE between the two heating values depends on the chemical composition of the fuel. In the CASE of pure carbon or carbon MONOXIDE, the two heating values are almost IDENTICAL, the difference being the sensible heat content of carbon dioxide between 150^oC to 25^oC.

220.

Why is air pre-heater used in the boiler?(a) To draw in the atmospheric air(b) To increase thermal efficiency(c) To heat the air to superheated level(d) To heat the air in advanceThis question was posed to me in an interview for internship.I need to ask this question from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in portion Steam Power Plant of Energy Engineering

Answer»

Right option is (b) To increase THERMAL efficiency

The explanation: the purpose of the air preheater is to RECOVER the heat from the BOILER flue gas which increases the thermal efficiency of the boiler by REDUCING the USEFUL heat lost in the flue gas. As a consequence the flue gases are also conveyed to the flue gas struck at a lower temperature, allowing simplified design of conveyance system and flue gas stack.

221.

What type of gear mechanism is provided to rotate the turbine generator shaft?(a) Mutilated gear mechanism(b) Ratchet gear mechanism(c) Barring gear mechanism(d) Planetary gear mechanismI have been asked this question in an internship interview.This interesting question is from Types of Fuels in portion Steam Power Plant of Energy Engineering

Answer»

Correct answer is (c) BARRING gear MECHANISM

For explanation I WOULD say: Barring gear is the mechanism provided to rotate the turbine generator shaft at very low speed after unit STOPPAGES. Once the steam inlet VALVE is closed, the turbine comes down towards standstill.When it stops completely, there is a tendency for turbine shaft to deflect or bend if allowed to remain in same position for too long.

222.

Which of the following ash is suitable for selling?(a) Bed ash(b) Synthetic gypsum(c) Fly ash(d) ClinkersThis question was posed to me in homework.Asked question is from Cool and Ash Handling System topic in chapter Steam Power Plant of Energy Engineering

Answer»

Right option is (c) Fly ash

Best explanation: Fly ash is sold in the market, which is used in concrete bricks, cement clinkers, road subbase and as mineral filler in asphaltic concrete. Fly ash is very fine in its structure, COMPOSED mostly of silica made from burning of coal in the furnace or boiler. And ‘BED ash’ REFERS to the ash that’s struck on the walls of boiler which is very COARSE in nature.

223.

Which medium is used to carry ash in hydraulic system?(a) Air(b) Water(c) Steam(d) ConveyorThe question was asked in unit test.The above asked question is from Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

Answer»

Right choice is (b) WATER

The explanation: Water is used as the MEDIUM to carry ash at HIGH velocity. DEPENDING on water pressure the system is divided as LOW pressure system and High pressure system. In low pressure system, sloped sumps are used to move the ash at low velocity and in high pressure system nozzle sprays used to ram up the speed of ash flow.

224.

Which system is noisy out of all the following ash handling systems?(a) Steam jet ash handling system(b) Mechanical ash handling system(c) Pneumatic ash handling system(d) Hydraulic ash handling systemI have been asked this question in final exam.The above asked question is from Cool and Ash Handling System in division Steam Power Plant of Energy Engineering

Answer»

Correct option is (c) Pneumatic ash handling system

The explanation: The air is made to pass at very high PRESSURE in order to carry out the ash for long distance. Since the air is MOVING at high speed at high velocity in the conveying pipes, it tends to create a lot of NOISE by hitting the walls of pipe at swift turns and CURVES.

225.

S + O2 => ______(a) SO3(b) SO2(c) S^2-(d) 2SO2I got this question in an interview for internship.The query is from Combustion of Fuels in chapter Steam Power Plant of Energy Engineering

Answer»

The CORRECT choice is (b) SO2

The explanation: Based on MOLECULAR WEIGHT, 32 kg of sulfur combines with 32 kg of oxygen forming 64 kg of SO2

S + O2 => SO2

32 kg of S + 3 2 kg of O2 => 64 kg of SO2

1 kg of S + 1 kg of O2 => 2 kg of SO2.

226.

Which of the fuels give enormous amount of energy?(a) Gaseous(b) Solid(c) Liquid(d) NuclearThis question was addressed to me in final exam.This interesting question is from Gaseous Fuels & Nuclear Fuels in section Steam Power Plant of Energy Engineering

Answer»

Right choice is (d) Nuclear

Easiest explanation: Nuclear fuels result in generation of enormous amount of energy by nuclear reactions namely fission and FUSION. In fission reactions, a heavy atom is split by NEUTRONS into two lighter fragments. In fusion reactions, two lighter atomic nuclei are fused together to form a SINGLE, heavy nucleus. In order to carry out nuclear reactions fissionable MATERIALS are USED as fuels.

227.

Which is the correct advantage of solid fuels out of the given option?(a) They have low ignition temperature(b) They produce small amount of smoke(c) They have higher calorific value(d) They do not form any clinkerI had been asked this question during an interview.My doubt stems from Artificial Solid Fuels & Liquid Fuels in section Steam Power Plant of Energy Engineering

Answer»

Right answer is (a) They have low ignition temperature

The best explanation: They have low ignition temperature’. Ignition temperature is the MINIMUM temperature at which a substance starts to burn. DIFFERENT fuels have different ignition temperature. Some fuels have low ignition temperature and some have high ignition temperature. The fuels that have low ignition temperature are HIGHLY inflammable and burn quickly at the spark of fire. While some fuels that have high ignition temperature do not burn quickly. They REQUIRE heating to burn.For e.g., kerosene oil does not burn unless it is heated up to its ignition temperature.

228.

Which gas cooling is used in large generator units of steam plant?(a) Sulfur dioxide(b) Hydrogen(c) Carbon dioxide(d) NitrogenI had been asked this question by my school principal while I was bunking the class.This interesting question is from Types of Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

The correct answer is (b) Hydrogen

For explanation: Hydrogen gas cooling is used for large generator units in steam PLANT. Because it has the highest HEAT transfer COEFFICIENT of any known heat transfer coefficient of any gas and for its low VISCOSITY which reduces wind-age losses. This system requires special HANDLING during start up, with air in the generator enclosure first displaced by carbon dioxide before filling with hydrogen. This ensures that the highly flammable hydrogen does not mix with oxygen in the air.

229.

What is the alternative cooling method for the thermal plant?(a) Wet cooling(b) Evaporation cooling(c) Dry cooling(d) Central air dampingI got this question by my school teacher while I was bunking the class.My question is based upon Cooling Water System, Air & Fuel Gas System in chapter Steam Power Plant of Energy Engineering

Answer»

Right CHOICE is (c) Dry COOLING

To EXPLAIN I would say: The alternative way of cooling method is dry cooling. Where in this method the heat is directly transferred to air via high flow forced drafts [INDUSTRIAL sized fans]. This is less efficient compared to wet cooling method since it uses very high amount of power to rotate the fans. Dry cooling method is very useful in the DESERT areas, where water scarcity is a huge problem.

230.

What type of system is it when the cooling tower is preferred?(a) Closed system(b) Open system(c) Closed loop system(d) Open loop systemThis question was posed to me in an interview for job.The doubt is from Cooling Water System, Air & Fuel Gas System topic in section Steam Power Plant of Energy Engineering

Answer»

Correct option is (a) Closed SYSTEM

To explain I would say: When there is a scarcity of water a cooling tower is installed, such system is known as the closed system. In this system the condensed water is cooled by passing it through the cooling tower and water is sprinkled over steam. The LOSS of water DUE to EVAPORATION is compensated by SUPPLY of water directly from the river.

231.

Which medium is used to carry ash in the pneumatic ash handling system?(a) Conveyor belt(b) Water trough(c) Air(d) Chain beltI had been asked this question by my college director while I was bunking the class.This is a very interesting question from Cool and Ash Handling System in section Steam Power Plant of Energy Engineering

Answer»

The correct option is (c) Air

The BEST I can EXPLAIN: In pneumatic ash handling system, Air is used to carry ash to LONG distance at a capacity of 5 to 30 tonnes PER hour. And the air used for this purpose is easily cleanable and can be exhausted back into atmosphere after the complete filtration processes.

232.

Road transportation of coal is preferred for what type of usage?(a) Small capacity plant(b) Medium capacity plant(c) Large capacity plant(d) Domestic usage areasThe question was asked in an online quiz.I'm obligated to ask this question of Necessity of a Steam Plant topic in chapter Steam Power Plant of Energy Engineering

Answer»

The correct option is (a) Small capacity PLANT

For explanation: Road transportation of coal is ideal TRANSPORTING coal directly to point of consumption. These small capacity plants are usually located in the middle of land. Trucks and tippers are USED to supply coal for this purpose. And also when the plant doesn’t have railway or shipway accessibility in such areas ROADWAYS are only possible means of transportation.

233.

Total power generated is usually contributed by power generated through ____________(a) Hydel power plant, Thermal power plant and solar plant(b) Ocean thermal energy, Wind energy and Hydel power plant(c) Hydel power plant, Geo-thermal plant and Nuclear power plant(d) Hydel power plant, Thermal power plant and nuclear power plantI got this question in exam.This intriguing question originated from Necessity of a Steam Plant in division Steam Power Plant of Energy Engineering

Answer»

The correct answer is (d) Hydel power plant, THERMAL power plant and nuclear power plant

Best EXPLANATION: The energy or power produced from hydel power plant, thermal power plant and nuclear power plant is very abundant compared to any other combinations of power PRODUCING plants.All these three plants have ability to produce the power in THOUSANDS of MEGAWATTS in its own standards.

234.

H2 + O2 => _____(a) H2O(b) OH(c) H3O(d) 2H2OI have been asked this question by my college professor while I was bunking the class.Query is from Combustion of Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

Right choice is (d) 2H2O

To explain I would say: Based on molecular WEIGHT, 32kg of sulfur combines with 32kg of oxygen forming 36KG of water.

Balanced equation: 2H2 + O2 => 2H2O

4kg of H2 + 32kg of O2 => 36kg of H2O

1kg of H2 + 8KG of O2 => 9kg of H2O.

235.

C + O2 => _______(a) CO(b) 2CO2(c) 2CO(d) CO3I had been asked this question by my school principal while I was bunking the class.Question is taken from Combustion of Fuels topic in division Steam Power Plant of Energy Engineering

Answer»

Right answer is (c) 2CO

The explanation is: Balanced equation: 2C + O2 => 2CO [Synthesis reaction]

 Oxygen is left in excess, based on the molecular weight, 24KG of carbon combines with 32kg of oxygen forming 56KG of carbon monoxide

24kg of C + 32kg of O2 => 56kg of CO

1kg of C + 4/3kg of O2 => 7/3kg of CO.

236.

What is the advantage of condensing the steam?(a) To cool down the steam(b) To discharge the same amount of feed water taken(c) Reduces the amount of pollution(d) Reduces the amount of fresh feed waterThe question was posed to me in quiz.I want to ask this question from Feed Water and Steam Generation System, Working of Thermal Power Plant in division Steam Power Plant of Energy Engineering

Answer»

The CORRECT option is (d) Reduces the amount of fresh feed water

Easiest explanation: The principle ADVANTAGE of condensing OPERATION is to REDUCE the amount of fresh feed water. A condenser is usually installed after the turbine to convert the exhaust steam from the turbine. They convert gaseous steam into liquid state, at a pressure below atmospheric temperature. Condensing of steam turbine below the atmospheric temperature, the steam pressure drops between the inlet and exhaust of turbine is increased, which increases amount of heat AVAILABLE.

237.

Chemicals are added in the feed water.(a) True(b) FalseI got this question in my homework.Query is from Feed Water and Steam Generation System, Working of Thermal Power Plant in chapter Steam Power Plant of Energy Engineering

Answer»

Correct choice is (a) True

Easy explanation: CHEMICALS are put into feed water through the chemical feed tank to KEEP water WITHIN chemical range. These chemicals are mostly oxygen scavengers and phosphates. The BOILER water also has frequent blow downs in order to keep the chloride CONTENT down.

238.

How is water pumped into condenser tubes in the steam power plant?(a) Water clarifier plant(b) Draught systems(c) Hydraulic capacity electric motor pump(d) Drawing through waterI had been asked this question in an interview for job.My doubt stems from Cooling Water System, Air & Fuel Gas System topic in division Steam Power Plant of Energy Engineering

Answer»

The correct ANSWER is (a) WATER clarifier plant

The explanation is: The water is pumped into condenser tubes through water clarifier plant. Clarifier helps in SUSPENDING solids from water in order to AVOID damages to condenser tubes. Clarifiers are available in wide varieties of CAPACITIES of capacities and shapes depending on the steam plant.

239.

What material is used in pipe linings for linking of steam jet system?(a) Nickel alloy(b) Graphite(c) Titanium(d) Copper alloyI had been asked this question during an internship interview.I'm obligated to ask this question of Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

Answer»

The CORRECT option is (a) Nickel alloy

Easiest explanation: The ABRASIVE particles present in ash CAUSE wear and tear in pipes due to high speed movement in pipes of steam jet system. Even chilled iron also can be used to line the pipes to overcome the FOLLOWING problem. And also avoiding BENDS and turns in pipes would reduce the damage of pipes.

240.

What is the advantage of using flue gas inside a boiler?(a) Heats up boiler water tube quickly(b) Reduces the amount of amount of exhaust(c) Speeds of the process of boiler(d) Reduces the green house of effectI got this question in final exam.This intriguing question comes from Cooling Water System, Air & Fuel Gas System topic in section Steam Power Plant of Energy Engineering

Answer»
241.

Which of the following ash handling system is not flexible to re-locate/re-place its discharging site?(a) Steam jet ash handling system(b) Mechanical ash handling system(c) Hydraulic ash handling system(d) Pneumatic ash handling systemI got this question during an interview for a job.Origin of the question is Cool and Ash Handling System topic in section Steam Power Plant of Energy Engineering

Answer»

Correct option is (c) Hydraulic ASH handling system

For EXPLANATION: Since the hydraulic ash handling system involves the USAGE of liquids, the discharging sites cannot be re-located/re-placed. Else constructing/developing a new discharging site is possible but the old one cannot be replaced since it is a wet system. In case of all other forms of ash handling system it is EASY since they are dry system and they won’t have much of an impact on the following discharging site/land.

242.

What is the capacity of low pressure hydraulic ash handling system?(a) 80 tonnes/hour(b) 22 tonnes/hour(c) 50 tonnes/hour(d) 10 tonnes/hourThis question was addressed to me in an international level competition.I would like to ask this question from Cool and Ash Handling System in division Steam Power Plant of Energy Engineering

Answer»

Correct answer is (c) 50 tonnes/hour

The BEST explanation: The capacity of LOW pressure hydraulic ash handling system is 50tonnes/hour at a SPEED of 3m/s. Since the ash PRODUCED is mixed in water and dumped, the water has the ability to dissolve and intake more amount of ash. And this mixture is spread throughout the sump.

243.

Large amount of coal is transported by ________(a) railway(b) sea or river ways(c) road transportation(d) by airliftingThis question was addressed to me by my school principal while I was bunking the class.Origin of the question is Cool and Ash Handling System in division Steam Power Plant of Energy Engineering

Answer»

Correct option is (a) railway

The best EXPLANATION: The railway is PREFERRED since it is quite economical as well as loading and unloading of COAL is easy.And at stretch tons of coal can be transported by goods train from one place to another place. Coal is considered as a bulk commodity value which FALLS in category of minerals and ores. If roadways are preferred only minimal amount of load can be transported. But by railway, long DISTANCES with huge amount of coal can transported to any region/part of the country.

244.

What is the primary objective of a steam power plant?(a) To convert one form of energy into another form(b) To produce electricity(c) To provide employment(d) To serve as a base load plant to hydel plant or nuclear plantI got this question in final exam.Enquiry is from Necessity of a Steam Plant in section Steam Power Plant of Energy Engineering

Answer»

Correct option is (b) To produce electricity

To explain I would say: The primary objective of the steam power PLANT is to produce electricity and then SERVING as base load plant to hydel or nuclear power plant comes as SECOND PRIORITY. Steam power plants produce 86% of electricity. And the EFFICIENCY of steam power plant is typically 33%-48%.

245.

What is necessary for complete combustion of fuels?(a) There should be no water content in the fuel(b) Sufficient amount of air is required(c) High quantity of fuel(d) Open space to burn easilyThe question was asked in quiz.Question is taken from Combustion of Fuels in chapter Steam Power Plant of Energy Engineering

Answer» CORRECT choice is (b) Sufficient amount of air is required

Easy explanation: For complete COMBUSTION of fuels, it is NECESSARY to supply sufficient amount of air. If air supplied is not sufficient then combustion will be incomplete. This means carbon in the fuel burns to produce carbon MONOXIDE (CO) instead of carbon dioxide (CO2), and thus reducing the amount of OXYGEN required and amount of heat generated.
246.

What gaseous Fuel is obtained by passing steam over candescent coke?(a) Producer gas(b) Water gas(c) Coal gas(d) Coke over gasI had been asked this question during an internship interview.I'd like to ask this question from Gaseous Fuels & Nuclear Fuels in section Steam Power Plant of Energy Engineering

Answer»

The correct OPTION is (B) Water gas

The explanation: Water gas is OBTAINED by passing steam over candescent coke. It burns with a BLUE flame and hence it is known as blue water gas. It has CALORIFIC value ranging between10500KJ/mm^3 to 2300KJ/mm^3. It is used in welding and in furnaces.

247.

Which liquid fuel has a wider composition than diesel and used in furnaces of oil fired boiler?(a) Fuel oil(b) Petrol(c) Distillate(d) AlcoholThe question was asked in unit test.I'd like to ask this question from Artificial Solid Fuels & Liquid Fuels in portion Steam Power Plant of Energy Engineering

Answer» CORRECT option is (a) Fuel oil

To explain: Fuel oil is similar to diesel but has wider composition than diesel. It is used in furnaces of oil fired BOILERS. Broadly speaking, fuel oil is any liquid fuel that is burned in furnace or boiler for the generation of power, except oil is having a FLASH point of approximately 42^oC and oils burned in cotton or wool-wick BURNERS.
248.

What type of steam is produced in the steam boiler?(a) Low pressure steam(b) High pressure steam(c) Saturated steam(d) Unsaturated steamThis question was posed to me at a job interview.The question is from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in chapter Steam Power Plant of Energy Engineering

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Right choice is (C) Saturated STEAM

To explain: The boiler is an integral COMPONENT of steam engine. A boiler incorporates a FIREBOX or furnace in order to burn the fuel and generate heat. The generated heat is transferred to water to make steam. This produced saturated steam at a rate which can vary according to pressure. The saturated steam THUS can produced can either be used immediately to produce power via turbine.

249.

What is the storage used to hold the condensed water?(a) Reservoir(b) Tarn(c) Hot well(d) BasinThe question was asked during an interview.My query is from Feed Water and Steam Generation System, Working of Thermal Power Plant in division Steam Power Plant of Energy Engineering

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Right option is (c) Hot well

Best explanation: Hot well is used for storage of the condensed water in a power plant. A TANK or RESERVOIR in which hot water is collected before being recirculated, especially condensed steam about to be RETURNED to a boiler is CALLED Hot well.

250.

What is the role of breaker house in coal feeding?(a) To break the coal into smaller pieces(b) To separate different sizes of coal(c) To separate the light dust from the coal(d) To powder the coalThe question was posed to me in examination.Question is taken from Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

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The correct choice is (C) To SEPARATE the light dust from the coal

The explanation: Because of the brittle nature of the coal, it is a common nature of coal to emit light dust/coal dust during TRANSPORTATION, mining and MACHINE handling. This dust needs to be cleared out and it is performed by coal breaker.