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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.

151.

_________ is used in high pressure hydraulic ash handling system, to quench the ash.(a) Turbines(b) Lubricants(c) Water troughs(d) Nozzle spraysI got this question by my school principal while I was bunking the class.This intriguing question comes from Cool and Ash Handling System in division Steam Power Plant of Energy Engineering

Answer»

The correct choice is (d) Nozzle sprays

For explanation I would SAY: As we know Nozzles are used to increase pressure. Also, they are also used to quench the ash. The ash falling from the CONVEYOR belt is quenched to make it FLOW down through the sump. Water trough is used in order to AVOID dust creating from falling ash from the furnace.

152.

What is the function of cyclone separators in pneumatic ash handling system?(a) To separate the lighter dust particles(b) To force up the movement of ash through pipes or tubes(c) To draw out the dust from furnace(d) To separate minute coal particlesThis question was addressed to me during an online exam.The origin of the question is Cool and Ash Handling System topic in division Steam Power Plant of Energy Engineering

Answer»

The correct answer is (a) To SEPARATE the lighter dust particles

Best explanation: Cyclone SEPARATORS use air to swirl around the ash that has been dispensed into them. Due to centrifugal action heavier ash SETTLES down, where as lighter dust/ash particles is collected in hopper and DUMPED out. The air flows in helical pattern which makes easy for the heavier dust particle to settle down easily without interrupting the airflow.

153.

When coal is being burnt how much % of ash is formed compared to the whole amount?(a) 10-20%(b) 40-50%(c) 25-35%(d) 4-10%This question was posed to me in an online interview.The query is from Cool and Ash Handling System topic in division Steam Power Plant of Energy Engineering

Answer»

The correct OPTION is (a) 10-20%

For explanation I would SAY: The coal AVAILABLE in nature already contains some percent of ash and when it is burnt. Due to its brittle nature more amount of ash is produced.And coal is one of the largest types of industrial waste generated. For environmental benefits, this coal ash is reused as a type of by-product in DIFFERENT types of industries.

154.

Why is it important to prefer ash handling systems?(a) Coal ash produced destroys the machinery by entering into them(b) Coal ash produced annually accounts for thousands of tones(c) Coal ash can be reutilized for some other purpose(d) Coal ash affects the health of people working at plantsThis question was addressed to me during an online interview.Origin of the question is Cool and Ash Handling System topic in division Steam Power Plant of Energy Engineering

Answer»

The correct ANSWER is (B) Coal ash produced ANNUALLY accounts for thousands of tones

For explanation I would say: Considering the LARGE coal burning capacity plant of modern times, the amount of ash produced when the coal is burnt is in thousands of tones. It could have an effect on other subjects too if the proper ash handling methods are not FOLLOWED. And for different environmental, economical and product benefits the coal ash is reused by different types of industries in different ways of its necessity.

155.

Which formula is used to determine higher calorific value of fuel?(a) Rayleigh’s formula(b) Lamme’s equation(c) Dulongs’s formula(d) Cauchy’s formulaI have been asked this question in an online quiz.The query is from Calorific Value of Fuels in chapter Steam Power Plant of Energy Engineering

Answer»
156.

Which form of fuel is used as a domestic form of fuel?(a) Wood(b) Bituminous Coal(c) Dung cake(d) Anthracite coalThis question was addressed to me in examination.Question is from Types of Fuels topic in portion Steam Power Plant of Energy Engineering

Answer»

The correct choice is (a) WOOD

Explanation: wood is mainly used as a domestic fuel. It has low calorific value of about 10500 kJ/kg. It CONSISTS of about 48.5% C; 6% H2; 1.5% of ash; 43.5% O2 and 0.5% N2. Wood fuel is used in different FORMS such as firewood, CHARCOAL, chips, sheets, pellets and sawdust. The particular form used depends upon factors such as source, QUANTITY, quality and application.

157.

What is the significance of calorific value?(a) Helps in deciding which fuel is good(b) Helps in locating fuel(c) Helps in deciding ignition temperature(d) Helps in deciding fire pointThis question was addressed to me in my homework.I'm obligated to ask this question of Calorific Value of Fuels topic in portion Steam Power Plant of Energy Engineering

Answer»

The CORRECT ANSWER is (a) Helps in deciding which fuel is good

The explanation: The different fuels have different calorific values, i.e. different fuels produce different amount of heat in heat on burning. The calorific VALUE of fuel helps us to decide that which fuel is good for us. This is done by COMPARING the calorific values of fuels with each other. USUALLY, a fuel having higher calorific value is considered to be a good fuel.

158.

The substance which helps in combustion of fuels is called _________(a) Igniter(b) Flammables(c) Supporter(d) InflammablesI had been asked this question in an online interview.I would like to ask this question from Combustion of Fuels topic in division Steam Power Plant of Energy Engineering

Answer»

The CORRECT OPTION is (c) Supporter

To elaborate: The substance which HELPS in combustion of fuels is called supporter fuels/combustible elements. For EXAMPLE, oxygen is a supporter of combustion because in the absence of oxygen fuels cannot burn.

159.

How is flue gas discharged through the chimneys?(a) By using induced draught fan(b) By using balanced draught fan(c) By using forced draught fan(d) By using mechanical draught fanI had been asked this question during an internship interview.The origin of the question is Cooling Water System, Air & Fuel Gas System topic in portion Steam Power Plant of Energy Engineering

Answer»

Right choice is (a) By using INDUCED draught fan

To explain: After extracting maximum possible heat by CIRCULATING the FLUE gas in furnace. Induce draught fan is used to remove the left over gas via chimney. This is located near the base of the chimney. The air is sucked in by reducing the pressure below atmosphere. The draught produced is independent of temperature of hot gases.

160.

What do you get when breeding process is carried out on 90Th^232?(a) 92U^233(b) 92U^234(c) 92U^235(d) 92U^236I have been asked this question in homework.I would like to ask this question from Gaseous Fuels & Nuclear Fuels in chapter Steam Power Plant of Energy Engineering

Answer» RIGHT answer is (a) 92U^233

The EXPLANATION is: When breeding process is PERFORMED on 90Th^232 (Thorium)

90Th^232 + 0n^1 → 90Th^233 + γ -radiation

90Th^233 → 91Pa^233 (Protactinium) + -1e^0 (ELECTRON)

91Pa^233 → 92U^233 + -1e^0.
161.

In what forms are liquid fuels available in nature?(a) Light distillate(b) Petroleum spirit(c) Petroleum naphtha(d) Crude petroleumThe question was posed to me in unit test.This interesting question is from Artificial Solid Fuels & Liquid Fuels topic in chapter Steam Power Plant of Energy Engineering

Answer»

The correct choice is (d) Crude petroleum

Explanation: Liquid fuels are available in nature in the form of crude petroleum. All commercial liquid fuels are derived from crude petroleum or crude oil. The crude oil, as it COMES out from oil WELLS contains 83-87% carbon, 10-14% hydrogen and SMALL percentages of SULFUR, nitrogen, oxygen and gases containing mainly ETHANE and methane.

162.

How is water dispensed over to the turbine blades?(a) Trough(b) Nozzle(c) Hose(d) PumpThe question was posed to me during an interview for a job.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»

Correct answer is (b) Nozzle

For EXPLANATION I would say: Nozzle is used to dispense the water over to the turbine BLADES of steam turbine. A nozzle is a duct that INCREASES the velocity of the FLOWING fluid at the expense of pressure drop. It’s a duct which decreases the velocity of fluid and increases pressure difference.

163.

CO + O2 => _______(a) 2CO2(b) CO2(c) CO(d) CO3I have been asked this question in quiz.Enquiry is from Combustion of Fuels in portion Steam Power Plant of Energy Engineering

Answer»

The correct CHOICE is (a) 2CO2

To explain I WOULD say: Based on molecular WEIGHT, 56kg of carbon monoxide combines with 32KG of oxygen forming 88kg of CO2

Balanced EQUATION: 2CO + O2 => 2CO2

56kg of CO + 32kg of O2 => 88kg of CO2

1kg of CO + 4/7kg of O2 => 11/7kg of CO2.

164.

What does steam power plant mainly use to generate steam?(a) Boiled water(b) Fresh steam(c) Flue gas(d) Condensed waterI had been asked this question in an online quiz.This intriguing question originated from Feed Water and Steam Generation System, Working of Thermal Power Plant in portion Steam Power Plant of Energy Engineering

Answer»

Right option is (c) Flue gas

For EXPLANATION: Steam power mainly uses hot products of combustion known as flue gas to generate steam in a boiler. Heat is GENERATED by burning coal, oil or gas. For this purpose boiler furnace is designed for FIRING coal, AIR or gas. The flue gas is exhausted via chimney after making maximum utilization of it.

165.

How much amount of water does typical 1GWe plant uses for cooling per day?(a) 30 mega litre(b) 45 mega litre(c) 55 mega litre(d) 75 mega litreThe question was asked by my school principal while I was bunking the class.The origin of the question is Cooling Water System, Air & Fuel Gas System in portion Steam Power Plant of Energy Engineering

Answer»

Right answer is (d) 75 mega litre

The best explanation: Water is used in a plant to convert it into steam and utilize it for developing mechanical energy as well as it is used for the cooling of the steam PRODUCED. This water is SUPPLIED by the large water bodies like river or BIG lakes. The amount of utilized from water body is all discharged back at the end.

166.

What is the distance up to which steam jet ash handling system is capable of removing ashes?(a) 200m(b) 50m(c) 75m(d) 350mThe question was posed to me in final exam.I need to ask this question from Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

Answer»

Correct OPTION is (a) 200m

The best I can explain: Even though the size of the steam JET ash handling capacity is compact, the high velocity steam jet can easily remove the ashes up to 200m. Since it is small SIZED plant its capability to remove ashes is limited. The moisture of steam ALSO makes the ash wet and it would gain a light amount of weight which becomes a BIT difficult to move ash at a longer distances.

167.

Which gaseous fuel is found dissolved in petroleum under earth’s surface in oil and gas bearing areas?(a) Natural gas(b) Coal gas(c) Mond gas(d) Producer gasThis question was posed to me during an online exam.This is a very interesting question from Gaseous Fuels & Nuclear Fuels in portion Steam Power Plant of Energy Engineering

Answer»
168.

What is the main purpose of using an economizer in a boiler?(a) To control the process of steam conversion(b) To reduce energy consumption(c) To increase the temperature of boiler(d) To maintain a constant temperature inside a boilerI got this question during an interview.Question is taken from Feed Water and Steam Generation System, Working of Thermal Power Plant in portion Steam Power Plant of Energy Engineering

Answer»

Correct option is (a) To CONTROL the PROCESS of steam conversion

For explanation I would say: Economizer in boilers is used to heat fluids, upto a certain degree not beyond the boiling point of that fluid. Economizers are named so because they can make use of ENTHALPY in fluid stream that are hot, thereby MAKING more useful enthalpy and improving the boiler’s efficiency.

169.

What is the pH value at which the boiler is alkalized?(a) 9.0(b) 5.4(c) 6.9(d) 5.7I have been asked this question in an interview.The question is from Feed Water and Steam Generation System, Working of Thermal Power Plant in portion Steam Power Plant of Energy Engineering

Answer»

Correct answer is (a) 9.0

To explain I would say: The boiler is alkalized to pH value of 9.0 to reduce oxidization and to support the formation of a stable layer of magnetite on water side surface of the boiler protecting from oxidation. And also oxygen scavengers are used to remove RESIDUES of oxides, especially O2 & CO2 [oxygen and carbon DIOXIDE] MUST be removed. SODIUM hydroxide or ammonia is used for alkalization of the feed water.

170.

What is the purpose of chimney?(a) To provide air ventilation(b) To eliminate noise produced in the system(c) To exhaust flue gases those is induced(d) To help in to suck the air required for systemThe question was asked in an interview.Asked question is from Cooling Water System, Air & Fuel Gas System topic in section Steam Power Plant of Energy Engineering

Answer»

The correct option is (c) To exhaust flue gases those is induced

To explain: Chimneys are actually used to remove exhaust gases or products of combustion by using induced draught SYSTEM. Almost all chimneys are CONSTRUCTED by bricks vertically and at a certain height in ORDER EASILY RELEASE flue gases into atmosphere. The height of the chimneys shows its ability to transfer flue gases. The deposits of flue gas contaminations are made on the inner walls of the chimney.

171.

What type of draught fan is used to draw air from the air heater?(a) Balanced draught fan(b) Induced draught fan(c) Forced draught fan(d) Artificial draught fanI have been asked this question in homework.This question is from Cooling Water System, Air & Fuel Gas System in division Steam Power Plant of Energy Engineering

Answer»

Correct CHOICE is (c) Forced draught fan

Best explanation: Forced draught fan is used to draw the AIR. This is INSTALLED near the base of boiler and air is forced to pass through the FURNACE, economizer and to the air stack. This is also CALLED a positive draught system because pressure and air is forced to flow through the system.

172.

How much amount of steam is required to remove 1 ton of ash from the steam jet ash handling system?(a) 100kg(b) 450kg(c) 65kg(d) 200kgI have been asked this question by my school teacher while I was bunking the class.Question is taken from Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

Answer» RIGHT option is (a) 100kg

Best explanation: 100 kg of steam is required to remove 1 ton of ash. Since the steam let out is at very high VELOCITY, 1 ton of ash can be easily moved to compare and BALANCING to its weight ratio. And this wholesome amount of steam is generated by the BOILER present in the plant.
173.

Which fuels can breed fissile uranium-233 to be used in various kinds of nuclear reactor?(a) Thorium(b) Neptunium(c) Plutonium(d) RadiumThe question was posed to me in exam.My doubt stems from Gaseous Fuels & Nuclear Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

The correct answer is (a) Thorium

Explanation: Thorium fuels can breed fissile uranium-233 to be used in various KINDS of NUCLEAR reactor. The USE of thorium as a new PRIMARY ENERGY source has been tantalizing prospects for many years. It is fertile rather than fissile, and can only be used as a fuel in conjunction with a fissile material.

174.

Coal crushers are also known as__________(a) Lather(b) Coal combers(c) Feeder breakers(d) Coal washerThis question was posed to me during a job interview.My question is taken from Necessity of a Steam Plant topic in chapter Steam Power Plant of Energy Engineering

Answer»

Right option is (C) Feeder breakers

To explain I would SAY: Coal crushers are also known as feeder breakers since it is elaborated by the word itself. ‘Feeder’ depicts the FOLLOWING component coal being FED by the hoppers and ‘Breaker’ stands for breaking off into smaller pieces. And this SYNONYM is rarely used.

175.

The process of burning fuels in the presence of oxygen is called _________(a) Induction(b) Ignition(c) Condensation(d) CombustionThis question was addressed to me by my school principal while I was bunking the class.My question comes from Combustion of Fuels topic in portion Steam Power Plant of Energy Engineering

Answer»

Right option is (d) Combustion

Easy explanation: The process of burning fuels in the presence of oxygen is called combustion. Due to the presence of COMBUSTIBLE elements like carbon (C), HYDROGEN (H) and SULFUR (S), fuels burn in presence of oxygen and generate heat from the fuels.

176.

Which fuel is prepared by moulding finely ground coal under pressure?(a) Coke(b) Charcoal(c) Briquette coal(d) LigniteI had been asked this question in final exam.Origin of the question is Artificial Solid Fuels & Liquid Fuels in division Steam Power Plant of Energy Engineering

Answer»

Right choice is (C) Briquette coal

The explanation: Briquette coal is PREPARED by moulding finely GROUND coal under pressure with or without the addition of binding material. Most commonly used binding materials are coal tar, crude oil and clay. By using briquette coal, the fuel LOSS through boiler grates can be avoided.

177.

Which gaseous fuel is produced by passing air and steam over waste coal?(a) Blast furnace gas(b) Coal gas(c) Mond gas(d) Coke oven gasI got this question during an online exam.This intriguing question originated from Gaseous Fuels & Nuclear Fuels in section Steam Power Plant of Energy Engineering

Answer»

The correct choice is (c) Mond gas

Easy EXPLANATION: Mond gas is GASEOUS fuel that is produced by passing air and large amount of steam over waste coal at about 650^oC. It has a calorific VALUE of 5800KJ/mm^3. The mond gas process was designed to convert cheap coal into flammable gas, which was made up of mainly hydrogen while recovering ammonium sulphate. The gas produced was rich in hydrogen and poor in carbon monoxide. Although it COULD be used for some industrial purposes and power GENERATION, the gas was limited for heating or lighting.

178.

Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber?(a) Charcoal(b) Anthracite(c) Coke(d) Briquette coalI had been asked this question in semester exam.This is a very interesting question from Artificial Solid Fuels & Liquid Fuels in section Steam Power Plant of Energy Engineering

Answer»

Right choice is (c) Coke

To explain: Coal is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber in the absence of air 500^oC to 700^oC. During this process the volatile matter is removed from the coal, leaving a dull black color to coke. It is a hard porous STRUCTURE and smokeless. It contains 85 to 95% CARBON. When the bituminous coal is HEATED between 900^oC to 1000^oC, hard coke is produced. It is used in gas producing PLANTS and blast furnaces.

179.

What is the main purpose of demineralization treatment plant?(a) To remove deposits made on tube(b) To reduce scaling on tube(c) To remove salts(d) To filter the boiler waterI had been asked this question by my school teacher while I was bunking the class.My question is from Types of Fuels in division Steam Power Plant of Energy Engineering

Answer»

Right answer is (c) To remove salts

To elaborate: The salts (calcium and magnesium) of hard WATER have to be removed to overcome all types of effects caused by water on tubes. Demineralization treatment plant generally CONSISTS of cation, anion and mixed bed EXCHANGERS. These ions are recombined with water to form pure water. Very pure MINERALIZED water becomes highly corrosive once it absorbs oxygen.

180.

What is amount of minimum air required per kg of liquid fuel for complete combustion using carbon, oxygen, hydrogen and sulfur?(a) 1/23 [8/3 C + 8(H – (O/8)) + S](b) 1/100 [8/3 C + 8(H – (O/8)) + S](c) 1/100 [8/3 C + 8(H – (0/8))](d) 1/23 [8/3 C + 8(H – (0/8))]The question was asked in a job interview.My question is taken from Calorific Value of Fuels topic in chapter Steam Power Plant of Energy Engineering

Answer»

Right answer is (a) 1/23 [8/3 C + 8(H – (O/8)) + S]

Explanation: LET C, H, O and S represent percentage by mass of carbon(C), Hydrogen (H2), OXYGEN and sulfur respectively.

The mass of oxygen required for complete combustion of fuel is given by,

= 1/100 [8/3 C + 8H – O + S]

= 1/100 [8/3C + 8(H – (0/8)) + S]

 As air contains 23% of oxygen by mass, minimum air required for burning one kg of liquid fuel completely is given by,

Min. air required = 1/100 [8/3 C + 8(H – (O/8)) + S] 100/23

= 1/23 [8/3 C + 8 (H – (O/8)) + S].

181.

In what form is the coal used in boiler?(a) Big chunks.(b) Medium size crushed(c) Powder form(d) Mixed with fluidI got this question during an interview for a job.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 answer is (c) Powder FORM

To explain I WOULD say: The coal used for boiler is in powder form, in order to increase thermal efficiency. The different types of coal used in boiler are GENERALLY bituminous coal, BROWN coal and peat.Commonly bituminous coal is most preferred boiler fuel since it has VOLATILE matter from 8 to 33% and ash content of 5 to 16 %.

182.

In hydraulic ash handling system, large quantities of leachate under a positive pressure head in pond pose a constant threat to ________(a) cause pungent smell(b) the livelihood(c) ground water quality(d) the nearby floraI have been asked this question in my homework.My doubt stems from Cool and Ash Handling System in division Steam Power Plant of Energy Engineering

Answer»

Right CHOICE is (b) the livelihood

The explanation is: Since there is constant gravity pressure that is exerting on the SURFACE of the ponds or other water bodies where hydraulic ash is dumped. When the same water is absorbed into the ground, it affects the quality of ground water. This effect indirectly affects growth of PLANTS and degrades the LAND AROUND water body making it unusable.

183.

The amount of heat liberated by complete combustion of unit quantity of fuel is known as ________(a) Agitation(b) Combustion(c) Calorific value(d) ThermogenesisThis question was addressed to me in an interview.Origin of the question is Calorific Value of Fuels topic in division Steam Power Plant of Energy Engineering

Answer»

Right choice is (c) Calorific value

The best I can explain: when FUELS are BURNT, heat is produced. It can also be DEFINED as the amount of heat produced on complete burning of 1gm of FUEL. SI unit of calorific value is kJ/g. The chemical reaction is typically hydrocarbon or other ORGANIC molecule reacting with oxygen to form carbon dioxide and water and release heat.

184.

What accounts for the presence of water in the exhaust leaving as vapor?(a) Gross calorific value(b) Flash point value(c) Ignition temperature value(d) Net calorific valueThis question was posed to me during a job interview.Question is taken from Calorific Value of Fuels in section Steam Power Plant of Energy Engineering

Answer»

Correct OPTION is (a) Gross CALORIFIC VALUE

The explanation: Gross HEATING value accounts for water in the exhaust leaving as vapor, and includes liquid water in the fuel prior to combustion. This value is important for fuels like wood and COAL, which will usually contain some amount of water prior to burning.

185.

How is the amount of cooling required by the steam power plant determined?(a) By the capacity of plant(b) By the amount of exhausted gas(c) By its thermal efficiency(d) By the type of fuel used (coal or uranium)I got this question in an online interview.Query is from Cooling Water System, Air & Fuel Gas System topic in division Steam Power Plant of Energy Engineering

Answer»

Correct choice is (c) By its thermal efficiency

To explain: The amount of cooling required by the STEAM POWER plant is determined by its thermal efficiency. It has nothing to do WHETHER it is fueled by coal or uranium; NEITHER has it depended on the TYPE of power plant (nuclear, thermal or hydel). Nuclear power plants have lower thermal efficiency than thermal plants. Higher the thermal plants lower the water usage for cooling.

186.

Which fuel is commonly available in both caking and Non-caking forms?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI have been asked this question in exam.My enquiry is from Types of Fuels topic in chapter Steam Power Plant of Energy Engineering

Answer»

The CORRECT CHOICE is (b) Bituminous coal

Best explanation: Bituminous coal is the most commonly USED form of coal. It is available in both caking and non-caking forms. It burns with a yellow flame. It has calorific value of about 32000 kJ/kg. It consists of 81%C; 5%H2; 8% O2; 1.5% N2; 1% S; and 3.5% ash. Caking bituminous coal softens and forms a pasty mass if heated at higher temperature. This coal is used to manufacture coke. Non-caking bituminous coal doesn’t SOFTEN on heating and hence it is used in steam power plants.

187.

How can we achieve high thermal efficiency in a power plant?(a) Drawing high output with limited input(b) Decreasing the working temperature(c) Increasing the working temperature(d) Maintain large temperature differentialThe question was posed to me during an online interview.The origin of the question is Cooling Water System, Air & Fuel Gas System in portion Steam Power Plant of Energy Engineering

Answer»

The CORRECT answer is (d) Maintain large temperature DIFFERENTIAL

Easy explanation: The amount of heat discharged to environment depends on the PLANTS thermal efficiency. High efficiency is ACHIEVED by having a large temperature differential. Irrespective of whether it comes from high internal heat or low temperature external environment, or both. The thermal efficiency of today’s NUCLEAR power plant is around 35% whereas hotter coal burners can reach 40% or more. At last higher thermal efficiency is required to lower the water usage.

188.

What is the capacity of the steam jet ash handling system?(a) 45tonnes/hour(b) 15tonnes/hour(c) 30tonnes/hour(d) 150tonnes/hourThe question was asked in class test.This intriguing question originated from Cool and Ash Handling System topic in portion Steam Power Plant of Energy Engineering

Answer»

Right choice is (B) 15tonnes/hour

For explanation: The capacity of the steam jet ASH handling system is limited 15tonnes/hour since the plant built up is in less space. And it has ability to remove ash through a horizontal DISTANCE of 200m. the operation of this system is NOISY since steam jet of high VELOCITY is produced in such a limited place.

189.

Which ash handling system can be built up in limited space?(a) Mechanical ash handling system(b) Pneumatic ash handling system(c) Hydraulic ash handling system(d) Steam jet ash handling systemI had been asked this question by my school teacher while I was bunking the class.This question is from Cool and Ash Handling System in section Steam Power Plant of Energy Engineering

Answer»

The CORRECT option is (d) Steam jet ash handling system

Explanation: Steam jet ash handling system can be constructed particularly when there is a limited amount of space is available because not much amount of space is REQUIRED for its setup and operation. Pneumatic and HYDRAULIC ash handling system REQUIRE huge amount of space for their construction and operation. Steam jet ash handling system is used in SMALL capacity plants.

190.

The coal is fed to the furnace through _________(a) conveyor belt(b) wagon tipper(c) hopper(d) craneI had been asked this question in an internship interview.I want to ask this question from Cool and Ash Handling System in section Steam Power Plant of Energy Engineering

Answer»

Correct choice is (c) hopper

The explanation is: Hopper is the conical shaped slow COAL dispenser to the furnace. It is PLACED right above the furnace and a live feeder mechanism is set at end of hopper for a CONTROLLED flow.There is no REQUIREMENT of any EXTERNAL power/force since this works on gravity force.

191.

Based on what basis are fuels compared?(a) Fire point value(b) High calorific value(c) Flash point value(d) Low calorific valueI got this question during an interview for a job.Asked question is from Calorific Value of Fuels in chapter Steam Power Plant of Energy Engineering

Answer» RIGHT option is (d) Low CALORIFIC value

To explain: On basis of low calorific value the FUELS are compared. Low calorific value is the amount of heat EVOLVED when a unit WEIGHT of fuel is completely burnt and water vapor leaves with combustion products.
192.

C + O2 →_____(a) CO(b) CO2(c) CO3(d) 2COI got this question by my school teacher while I was bunking the class.The query is from Combustion of Fuels in portion Steam Power Plant of Energy Engineering

Answer»

The correct option is (b) CO2

The best I can explain: Based on molecular WEIGHT, 12kg of carbon combines with 32KG of oxygen FORMING 44kg of carbon dioxide.

i.e., 12kg of C + 32 kg of O2 => 44kg of CO2

1kg of C + 8/3kg of O2 => 11/3kg of CO2

Reaction type: SYNTHESIS.

193.

The minimum temperature at which a substance begins to burn is called ________(a) Fire point temperature(b) Auto ignition(c) Ignition temperature(d) Flash point temperatureThis question was posed to me in examination.The origin of the question is Combustion of Fuels in chapter Steam Power Plant of Energy Engineering

Answer»

Correct answer is (c) Ignition temperature

The explanation: The minimum temperature at which a substance begins to burn is called ignition temperature. No substance can catch FIRE unless it is HEATED up to a certain minimum temperature. The ignition of EVERY substance is definite. For example, the ignition temperature of white phosphorous is 35°C. It MEANS, white phosphorous STARTS burning only if it is heated up to 35°C.

194.

Which gaseous fuel is obtained by partial combustion of coke?(a) Coke oven gas(b) Producer gas(c) Coal gas(d) Blast furnace gasThis question was posed to me in a national level competition.I would like to ask this question from Gaseous Fuels & Nuclear Fuels topic in section Steam Power Plant of Energy Engineering

Answer»

Correct option is (b) Producer gas

For explanation I would say: Producer gas is OBTAINED by partial COMBUSTION of coke or COAL in the presence of air and steam mixture. It has a calorific VALUE ranging between 5000 kJ/mm^3 to 6800 kJ/mm^3. It is used in glass melting in Industries and also for power generation.

195.

Which gaseous fuel is obtained by carbonization of bituminous coal?(a) Blast furnace gas(b) Coal gas(c) Producer gas(d) Coke oven gasI had been asked this question during an interview for a job.This key question is from Gaseous Fuels & Nuclear Fuels topic in chapter Steam Power Plant of Energy Engineering

Answer»
196.

Fuels are classified as primary and secondary fuel based on the __________(a) Capacity to burn(b) Availability(c) State(d) OccurrenceThe question was posed to me in an online quiz.The question is from Types of Fuels in division Steam Power Plant of Energy Engineering

Answer»

Right option is (d) Occurrence

Explanation: BASED on the occurrence, fuels are classified as primary fuels and secondary fuels. A primary fuel is available in NATURE E.g., wood, peat, lignite, natural gas, petroleum, etc. A primary fuel is also CALLED as a natural fuel. A secondary fuel is not available in nature, but it is prepared from primary fuel by artificial means e.g. gasoline, diesel, coke gas, blast FURNACE gas, kerosene etc. A secondary fuel is also known as artificial fuel.

197.

Which fuel is called secondary stage in the formation of coal?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI had been asked this question in an online interview.Origin of the question is Types of Fuels topic in section Steam Power Plant of Energy Engineering

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Correct option is (a) Lignite

Easiest explanation: Lignite is the secondary stage in the formation of coal. It is brown in COLOR and hence known as brown coal. It is used as a LOW grade fuel especially for domestic use and also as a boiler fuel. It is the intermediate stage between bituminous coal and peat. It has a calorific value of about 12500 kJ/kg. It consists of 66% C; 5% H2; 20% O2; 1% N2; 1% S and 3.5% ash and other incombustible.

198.

What type of system is it, when the water is directly is used to condense the steam?(a) Closed system(b) Open system(c) Closed loop system(d) Open loop systemI got this question in an internship interview.I need to ask this question from Cooling Water System, Air & Fuel Gas System topic in division Steam Power Plant of Energy Engineering

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199.

In what form does the total ash produced in the furnace escapes through the chimney?(a) Fines(b) Aerosols(c) Gas(d) CinderThis question was posed to me during an internship interview.My question is taken from Cool and Ash Handling System in chapter Steam Power Plant of Energy Engineering

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Right ANSWER is (a) Fines

The explanation: Fines are the particles which vary in the SIZE of 1 to 80 microns. These COULD easily get escaped into AIR via chimneys. About 80% of ash produce is in this RANGE of microns and everything gets easily escaped into air and the rest is made use for other possible purposes.

200.

What would be the amount of distance that a low pressure system could carry the ash?(a) 25m(b) 500m(c) 150m(d) 800mI have been asked this question during an online exam.Question is from Cool and Ash Handling System topic in chapter Steam Power Plant of Energy Engineering

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The correct choice is (b) 500m

For EXPLANATION I would say: Low pressure system MOVES the ash mixed in WATER at a distance of 3 to 5 m/s in a sloped pump made of reinforced constituents and this movement is continuous. So, it has the ability to carry the ash for such LONG distance.There is no requirement any auxiliary source to move the ash mixed with water.