A. half

B. three

D. two

E. one-fourth

A. measuring oxygen in flue gases

B. measuring temperature of flue gases at exit of furnace

C. smoky chimney exit

D. excess air in flue gases

A. dry

B. superheated

C. saturated

D. supersaturated

A. clean the nozzles

B. reduce flame length

C. aid in proper combustion

E. keep the burner tips cool

A. more

B. equal

D. could be more or less depending on the size of plant

E. none of the above

A. radiation and convection

B. convection

D. conduction

E. radiation and conducton

A. 218 kg/cm2 abs and 540C

B. 100 kg/cm2 and 540C

C. 1 kg/cm2 and 100C

D. 100 kg/cm2 abs and 373C

B. the exact analysis

C. its type

D. the content of ash and heating value

E. the content of sulphur

A. less

B. less or more depending on size of boiler

D. same

E. unpredictable

A. linear characterisstic

B. none of the above

C. drooping characteristic

D. flat characteristic

A. copper

B. aluminium

C. iron

D. nickel

A. remains unchanged

B. increases

D. increases/decreases depending on steam temperature requirements

E. unpredictable

A. 1 + moisture content

B. (1 + moisture content)

D. 1 moisture content

A. chimney

C. induced draft fan

D. smoke meter

E. pulveriser

A. inject chemical solution in feed pump

B. none of the above

D. add make up water in the system

E. create vacuum

A. all the three above plus gas cycle efficiency

B. regenerative cycle efficiency

D. rankine cycle efficiency

E. carnot cycle efficiency

A. high calorific value coal being burnt

C. raising of steam temperature

D. leakage of air

E. higher effectiveness of boiler

A. boiler evaporative capacity

B. boiler effectiveness

C. factor of evaporation

D. equivalent evaporation

A. increase *heat transfer rate

B. increase efficiency-of thermal power plant

C. reduce hardness and for removal of solids

D. all of the above

E. increase steam parameters

A. avoid explosion in furnace

B. prevent atmospheric air leaking into furnace

D. support furnace freely from top

E. prevent leakage of hot flue gases

A. corroding air heaters

C. causing clinkering and slagging

D. spontaneous combustion during coal storage

E. facilitating ash precipitation

A. increases

B. none of the above

C. remains same

D. behaves unpredictably

A. all the fuel burns instantaneously producing high energy release

B. none of the above

C. explosion in furnace

D. fuel burns with less air

A. to provide proper conditions for con-tinuous complete combustion

C. mix fuel with air and ignite

D. maintain heat supply to prepare and ignite the incoming fuel

E. to minimise radiation losses

A. none of the above

C. proper ignition temperature

D. 02 to support combustion

E. correct fuel air ratio

B. 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

C. heating of water takes place in stages

D. water is converted into steam in one pass without any recirculation

E. 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. none of the above

C. by direct mixing

D. from a metal wall from one medium to another

E. heat is transferred by bleeding some gas from furnace

A. chimney

B. induced draft fan

C. both combined A. and B.

E. none of the above

A. 85-90%

C. 81-85%

D. 95-100%.

E. 90-95%

A. outside diameter and inside diameter

C. inside diameter and thickness

D. mean diameter and thickness

E. outside diameter alone

A. equal

B. more

C. may be more or less depending on capacity of reheater

E. none of the above

A. burnt in excess air

B. burnt as lumps

D. burnt as powder

E. heated sufficiently

A. corrosion

B. carryover

C. scale

D. embrittlement

A. 2 cm

B. 15 cm

C. 12 cm

E. 8 cm

A. 100C

C. above wet bulb temperature of flue gases

D. less than wet bulb temperature of flue gases

E. below dew-point temperature of flue gases

B. heat consumed in evaporating 1 kg water at 0C to steam at 100C and 1.033 kg/cm pressure

C. steam evaporation rate per kg of fuel fired

D. work done by 1 kg of steam at saturation condition

E. work done in evaporating 1 kg of steam per hour from and at 100C into dry saturated steam

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