Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent. (A) 1 (B) 10 (C) 30 (D) 50

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
(A) 1
(B) 10
(C) 30
(D) 50
by

1 Answer

Answer :

(B) 10
by

Related questions

An economiser in a boiler........ A]Increases steam pressure. B]Increases steam flow C]Decreases fuel consumption D]Decreases steam pressure

Description : An economiser in a boiler........ A]Increases steam pressure. B]Increases steam flow C]Decreases fuel consumption D]Decreases steam pressure

Last Answer : C]Decreases fuel consumption

The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature

Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature

Last Answer : A]Increase thermal efficiency of boiler

In a boiler enthalpy of water supplied was 2000 kJ/kg. Enthalpy being added by fuel combustion is 3200 kJ/kg. Using first law of thermodynamics, find amount of heat supplied if steam generation rate is 10 tons per hour.

Description : In a boiler enthalpy of water supplied was 2000 kJ/kg. Enthalpy being added by fuel combustion is 3200 kJ/kg. Using first law of thermodynamics, find amount of heat supplied if steam generation rate is 10 tons per hour.

Last Answer : Heat supplied Q = m (h2-h1) …….(Steady flow energy equation for boiler) ; h2=3200 KJ/kg h1=2000 KJ/kg m = 10 Tons /hour = (10 x 1000)/3600 kg/sec = 2.77 Kg/sec Q = 2.77(3200-2000) = 3324 KJ/sec heat supplied for 10 Tons/hr steam generation

high pressure boiler generates steam at a pressure greater than __________ kg/cm2. (A) 10 (B) 30 (C) 50 (D) 80

Description : high pressure boiler generates steam at a pressure greater than __________ kg/cm2. (A) 10 (B) 30 (C) 50 (D) 80

Last Answer : Option D

The function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil

Description : The function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil

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Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace? (A) Economiser (B) Regenerator (C) Ceramic recuperator (D) Waste heat boiler

Description : Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace? (A) Economiser (B) Regenerator (C) Ceramic recuperator (D) Waste heat boiler

Last Answer : (B) Regenerator

Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an (A) Economiser (B) Steam superheater (C) Air preheater (D) All (A), (B) and (C)

Description : Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an (A) Economiser (B) Steam superheater (C) Air preheater (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

'Utilities' in a chemical process plant includes compressed air, steam, water, electrical power, oxygen, acetylene, fuel gases etc. Utility costs for ordinary chemical process plants ranges roughly from __________ percent of the total product cost. (A) 1 to 5 (B) 10 to 20 (C) 25 to 35 (D) 35 to 45

Description : 'Utilities' in a chemical process plant includes compressed air, steam, water, electrical power, oxygen, acetylene, fuel gases etc. Utility costs for ordinary chemical process plants ranges roughly from __________ percent of the total product ... 1 to 5 (B) 10 to 20 (C) 25 to 35 (D) 35 to 45

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The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load

Description : The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load

Last Answer : (A) Evaporative capacity

A __________ is a type of heat exchange system where water is heated to its' boiling point via combustion of a fuel blown through a tube submerged in water. a. Condensate loop b. Hyperbolic cooling tower c. Steam boiler d. All of above

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White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is (A) Tar (B) Coke oven gas (C) Pitch (D) Pulverised coke

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Last Answer : (B) Coke oven gas

Pick up the odd one out: b) Regenerator c) Recuperator d) Metallic recuperator e) Economiser

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Last Answer : Economiser

In a low to medium temperature waste heat recovery system which of the device is most suitable a) Economiser b) Heat wheels c) air preheater d) Recuperator

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Last Answer : Heat wheels

What is the critical point of steam generation in a “once through” boiler? a) 221.5 bar b) 221.4 bar c) 221.3 bar d) 221.2 bar

Description : What is the critical point of steam generation in a “once through” boiler? a) 221.5 bar b) 221.4 bar c) 221.3 bar d) 221.2 bar

Last Answer : d) 221.2 bar

What is the main disadvantage of Lamont boiler ? a. Less flexible in design b. Low heat transfer rate c. Formation of bubbles d. Low steam generation capacity

Description : What is the main disadvantage of Lamont boiler ? a. Less flexible in design b. Low heat transfer rate c. Formation of bubbles d. Low steam generation capacity

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Steam produced in a boiler can be used for a variety of purposes including space heating, drying and _________________ a. Sterilization b. Humidification c. Power generation d. All of above

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For every 10% increase in the excess air; the fuel consumption increases by __________ percent. (A) 0.1 (B) 0.2 (C) 0.5 (D) 1.0

Description : For every 10% increase in the excess air; the fuel consumption increases by __________ percent. (A) 0.1 (B) 0.2 (C) 0.5 (D) 1.0

Last Answer : (A) 0.1

Preheating of coal charge for the coke ovens reduces the (A) Time of carbonisation (B) Yield of gas and tar(C) Fuel consumption in coking(D) All (A), (B) and (C)

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A boiling water reactor is the one, in which the (A) Coolant water is allowed to boil in the core of the reactor (B) Coolant water, after being heated in the reactor core, generates steam in a boiler (C) Pressurised water is pumped into the core (D) Fuel and the coolant are thoroughly mixed to form a homogeneous solution

Description : A boiling water reactor is the one, in which the (A) Coolant water is allowed to boil in the core of the reactor (B) Coolant water, after being heated in the reactor core, generates steam ... water is pumped into the core (D) Fuel and the coolant are thoroughly mixed to form a homogeneous solution

Last Answer : (A) Coolant water is allowed to boil in the core of the reactor

What is the function of boiler? • To burn the fuel in a confined closed system With the supply of air • To generate steam in varying pressure • To generate steam at constant pressure • To produce flue gases by burning fuel at a given pressure

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Last Answer : • To generate steam at constant pressure

A _______ incorporates a firebox or furnace in order to burn the fuel and generate heat. • Steam • Boiler • Hydrogen • None

Description : A _______ incorporates a firebox or furnace in order to burn the fuel and generate heat. • Steam • Boiler • Hydrogen • None

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A -________ incorporates a firebox or furnace in order to burn the fuel and _________ heat. a. Boiler, generate b. Heat, boiler c. Steam, pressure d. None

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Last Answer : a. Boiler, generate

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Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines A Chemical energy B Heat energy C Thermal energy D All of the above

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The biggest loss in the boiler is a) Moisture in fuel b) Dry flue gases c) Steam formation d) Unburnt carbon

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Last Answer : b) Dry flue gases

What type of boiler does not need a steam drum ?

Description : What type of boiler does not need a steam drum ?

Last Answer : Super-critical pressure boiler.

A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

Description : A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

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Description : Most chemical plants use an initial working capital amounting to 10- 20% of the total capital investment. But this percentage may increase to __________ percent in case of seasonal products manufacturing plant. (A) 30 (B) 50 (C) 75 (D) 95

Last Answer : (B) 50

Cost of instrumentation in a modern chemical plant ranges from __________ percent of the total plant cost. (A) 5 to 10 (B) 20 to 30 (C) 40 to 50 (D) 60 to 70

Description : Cost of instrumentation in a modern chemical plant ranges from __________ percent of the total plant cost. (A) 5 to 10 (B) 20 to 30 (C) 40 to 50 (D) 60 to 70

Last Answer : (B) 20 to 30

Construction expenses are roughly __________ percent of the total direct cost of the plant. (A) 2 (B) 10 (C) 30 (D) 50

Description : Construction expenses are roughly __________ percent of the total direct cost of the plant. (A) 2 (B) 10 (C) 30 (D) 50

Last Answer : B) 10

Why boiler is purged everytime before starting firing of fuel ?

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.

Economizer is provided to utilize the flue gas heat for ___ a) preheating the boiler feed water b) preheating the stock c) preheating the combustion air d) preheating fuel

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Last Answer : preheating the boiler feed water

Maximum thermal efficiency of boiler may be about __________ percent. (A) 10 (B) 25 (C) 65 (D) 90

Description : Maximum thermal efficiency of boiler may be about __________ percent. (A) 10 (B) 25 (C) 65 (D) 90

Last Answer : (D) 90

Spent fuel from a nuclear power plant cools down and loses most of its radioactivity through decay. In the first year, spent fuel loses about what percentage of its radioactivity? w) 10 percent x) 50 percent y) 80 percent z) 100 percent

Description : Spent fuel from a nuclear power plant cools down and loses most of its radioactivity through decay. In the first year, spent fuel loses about what percentage of its radioactivity? w) 10 percent x) 50 percent y) 80 percent z) 100 percent

Last Answer : ANSWER: Y -- 80 PERCENT

In a typical power plant used to generate electricity in the U.S., the percentage of energy in the fuel that is converted to electricity is about: w) 99 percent x) 50 percent y) 35 percent z) 10 percent

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Last Answer : (A) 70 & 30

Maintain 850 OC for 1 hour (soaking time).  Cool the material to 60 OC in 4 hours. a) Calculate the efficiency of the furnace, if the specific heat of steel is 0.12 kcal/kgOC and fuel oil consumption per batch is 1400 litres.  GCV of fuel oil - 10200 kcal/kg,  Cost of fuel oil - Rs. 46,000/kL,  Sp. gr. of fuel oil - 0.92. b) Due to high cost of oil, the plant management decides to convert to a lower operating cost LPG fired furnace lined on the inside with ceramic fibre insulation and with an operating efficiency of 80%, for same requirement. The investment towards installation of the new furnace is Rs. 50 lakhs. Calculate the Return on Investment, if the plant operates two batches per day and 250 days in a year.  Cost of LPG - Rs. 75/kg,  GCV of LPG - 12500 kcal/kg.

Description : In a heat treatment shop, steel components are heat-treated in batches of 80 Tons. The  heat treatment cycle is as follows;  Increase temperature from 30 OC to 850 OC in 3 hours.  ... efficiency of 80%, for same requirement. The investment towards installation of  the new furnace is Rs. 50

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A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2. (A) 6 (B) 18 (C) 38 (D) 52

Description : A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2. (A) 6 (B) 18 (C) 38 (D) 52

Last Answer : (B) 18

31. Replacement of steam based hot water generation by solar system is an example of a) Matching energy usage to the requirement b) Maximising system efficiency c) Energy substitution d) Performance improvement

Description : Replacement of steam based hot water generation by solar system is an example of a) Matching energy usage to the requirement b) Maximising system efficiency c) Energy substitution d) Performance improvement

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Description : The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. (A) 50 (B) 65 (C) 85 (D) 99

Last Answer : (C) 85

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Description : Tractors with less specific fuel consumption should be preferred because..... A. High efficiency C. Good output B. Good for field D. Less cost

Last Answer : Less cost

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Description : Total primary energy consumption of fuel in the world is lead by a) Coal b) Nuclear c) Hydro d) Oil

Last Answer : coal

105. Energy and production data is useful to calculate…… a) Specific Energy Consumption b) Specific Fuel consumption c) Specific Cost d) None

Description : 105. Energy and production data is useful to calculate…… a) Specific Energy Consumption b) Specific Fuel consumption c) Specific Cost d) None

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71. Total primary energy consumption of fuel in the world is lead by a) Coal b) Nuclear c) Hydro d) Oil

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Last Answer : coal

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Description : Energy and production data is useful to calculate…… a) Specific Energy Consumption b) Specific Fuel consumption c) Specific Cost d) None

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Description : Heat recovery provides valuable energy sources and ....... consumption. a) Reduce energy b) Increase energy c) Increase fuel d) Reduce fuel

Last Answer : Reduce energy

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Description : A waste heat recovery system in industrial process has been key to reduce ....... Consumption. a) Coal b) Fuel c) Biogas d) Oil

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Description : Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. (A) 10-15 (B) 25-30 (C) 45-50 (D) 65-70

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