A. unpredictable

B. first increases and then decreases

D. increases

E. remains unaffected

A. increases

C. first decreases and then increases

D. remains unaffected

E. first increases and then decreases

A. extract heat from the exhaust flue gases

B. increase flue gas temperature

D. to heat feed water by bled steam

E. economise on fuel

A. Lower calorific value at constant volume ,

B. Lower calorific value at constant pressure

D. Higher calorific value at constant pressure

E. None of the above

A. steam volume remains constant

B. steam pressure remains constant

C. steam entropy remains constant

D. steam temperature remaisn constant

A. 8000-10,000 kcal/kg

B. 800-1200 kcal/kg

C. 200-400 kcal/kg

D. 5000-8000 kcal/kg

B. inherent moisture and surface moisture are different things

C. in some coals moisture may be present upto 40%

D. moisture in coal is removed before firing by heating it with hot air

E. some moisture in coal helps in better burning which is not possible with completely dry coal

A. fuel bed firing

B. supply of excess, air

D. supply of excess coal

E. none of the above

A. supply air for ignitors

B. cool the scanners

C. transport and dry the coal

D. provide air around burners for obtaining optimum combustion

B. convert CO (formed in lower zone of furnace) into C02 at higher zone

C. provide air around burners for obtaining optimum combustion

D. none ot the above

E. air-delivered by forced draft fan

A. straight inclined line

B. horizontal straight line

C. none of the above

E. curved line

A. lower calorific value

B. higher calorific value

C. best analysis

E. fixed carbon, ash, volatile matter, moisture

A. heat carried away by flue gases

B. moisture present in fuel and steam formed by combustion of hydrogen in fuel

D. heat carried away by ash

E. radiation

A. stoker fired boilers

C. medium sized units

D. more calorific value

E. less radiation loss

A. weight of water to be handled

C. pH value of water

D. cavitation of .boiler feed pumps

E. heat transfer coefficient

A. thorough mixing, total air, and temperature

B. total air, time, and temperature

D. none of the above

E. total air, true fuel, and turbulance

B. handling and maintenance should be easier

C. heat transfer area should be optimum

D. approach temperature should be as low as possible

E. none of the above

B. it helps in electrostatic precipitation of ash in flue-gases

C. it has heating value

D. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

E. none of the above

A. two

B. none of the above

D. one

E. one steam drum and one water drum

A. increases life of boiler

C. increases steam pressure

D. decreases steam pressure

E. increases steam flow

A. separate mills are required to powder the coal

B. heat release can be easily controlled

D. fuel burns economically

E. high burning rate is possible

A. steam pressure produced

B. kg of steam produced

C. kg of fuel fired

E. kg of water evaporated

A. vertically

C. on dished end

D. anywhere

E. longitudinally

A. very low pressure

C. medium pressures

D. none of the above

E. atmospheric pressures

A. convert CO (formed in lower zone of furnace) into C02 at higher zone

B. air delivered by induced draft fan

C. air fed to pulverisers

D. transport and dry the coal

A. 40%

B. 50%

C. 20%

D. 75%

A. 60%.

B. 20%

D. 15%

E. 45%

A. heating surface depends on other parameters

B. equal heating surface

C. less heating surface

E. none of the above

A. enthaply

C. all of the above

D. entropy

E. pressure

A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. feed pump is employed to supplement natural circulation in water wall type furnace

D. water is heated in a large number of tubes

E. water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

A. increases

B. may increase or decrease depending upon the method of storage

C. none of the above

E. remains constant

A. remain as it was

B. cool down

C. none of the above

E. boil

A. moisture and ash free heating value

B. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

C. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

E. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

B. 1 kg/cm2

C. 100 kg/cm2

D. 0.1 kg/cm2

E. it is never possible

B. is raised at same rate

C. none of the above is true

D. could be raised at fast/slow rate depending on design

E. is raisd at slower rate

A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

B. moisture and ash free heating value

D. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

E. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

B. outside temperature is very low

C. more than the tallest building nearby

D. around 200 meters

E. infinitely long

B. in the drum

C. above steam dome

D. at the inlet of chimney

E. in the fire tubes

A. quantity of flue gases to be handled

B. limitation of construction facilities

C. all of the above

D. the draft to be created

A. do not form ash

C. burn completely

D. burn freely

E. show little or no fusing action

A. same value

C. any value

D. higher value

E. none of the above

A. facilitates ash removal

B. promotes complete combustion

C. has high heating value

E. retards electric precipitation

A. radiation losses

B. ash content

C. unburnt carbon in ash

E. incomplete combustion

A. diverge from right to left

B. none of the above

C. are equally spaced throughout

E. first rise up and then fall

A. economical

B. optional

C. desirable

E. essential

A. first decreases and then increases

B. remains unaffected

C. first increases and then decreases

E. increases

B. control steam dome

C. avoid explosion

D. remove molten aslj

E. avoid excessive build up of pressure

A. provide foundation of boiler

B. provide support for boiler

C. take care of failure in compression

D. take care of failure in shear

A. former is fire tube type and latter is water tube type boiler

B. former is water tube type and latter is fire tube type

D. none/of the above

A. none of the above

B. bucket calorimeter

D. separating calorimeter

E. combined separating and throttling calorimeter