NPTI Boiler Questions

1. High percent percentage age of carbon carbon monoxide monoxide presence presence in the the flue gas gas of boiler boiler is an indicator indicator of  a) high excess air

b) complete combustion

c) good good cont contro roll of poll pollut utan ants ts

d) low low exce excess ss air  air 

2. An econ econom omiz izer er in in a Boil Boiler  er  a) Increases st steam pr pressure c) Decre ecreas ases es fuel uel com combusti ustio on

b) In Increases st steam fl flow d) Incr Increa ease se life life of boile oiler  r 

. !he efficie efficienc" nc" of bac#war bac#ward d cur$ed cur$ed fans compa compared red to forward forward cur$ed cur$ed fans fans is%% is%% a) Higher

b) &ower

c) 'ame

d) (one

. *educing *educing the the fan *+, b" 1- 1- decreases decreases the fan power power re/uireme re/uirement nt b" a) 1-

b) 20

c) 

d) none of the abo$e

. A boiler boiler generate generatess  !+H of steam steam at an efficie efficienc" nc" of 0 . !he !he enthalp" enthalp" added added to steam steam in the the  boiler is - 3cal4#g. 3cal4#g. !he fuel flow rate with with a 567 of -- #cal4#g #cal4#g is a) 12 #g4hr

b) 8-2 #g4hr

c) -9 #g4hr

d) 108 #g4hr 

8. !he minimum minimum capacit" capacit" of an" closed closed $essel $essel which which generate generatess steam under under pressure pressure as per per Indian Boilers *egulation Act is a) 2.20 2.20  litr litres es

b) 22.0 22.0  #ilo #ilo litr litres es

c) 220. 220.  litr litres es

d) 22.0 22.0  litr litres es

0. !he purpo purpose se of atomisati atomisation on in an oil oil fired fired burner burner is is to a) increase excess air c) reduce power consumption

b) increase the surface area of oil d) reduce the flue gas temperature

. De:aer De:aerati ation on of boi boiler ler feed feed water water is is referr referred ed to as a) remo$al of dissol$ed gases c) remo remo$a $all of scal scales es

b) remo$al of silica d) phos phosph phat atee trea treatm tmen entt of feed feed wate water  r 

9. &atent &atent heat heat of of steam steam at the the criti critical cal poi point nt is a) infinite

b) - #cal

c) zero

d) none of the abo$e

1-. !he size size of pul$eriz pul$erized ed coal is is a) 2- mm c) 0 micron

b) 0 mm d) 2-- microns

11. !he purpose of of $enting air from steam s"stems s"stems is because air is a a) insulator

b) good conductor

c) inert substance

d) dilutant

12. ;ater hammer is common in a) water pipes c) steam pipes with steam and condensate

b) condensate pipes d) main steam lines with good traps

1. Drain poc#ets are pro$ided in a steam line for  a) effecti$e remo$al of steam c) chec#ing of steam line

b) remo$al of dirt d) effecti$e remo$al of line condensate

1. ;hat t"pe of steam is generall" used for power generation4application. a) high pressure steam with super heat

b) dr" saturated low pressure steam

c) dr" saturated steam with high pressure

d) wet steam with $er" high pressure

1. !he natural draught is produced b" a) 'team in a boiler> is b" a centrifugal pump> then the boiler is #nown as a) ?xternall" fired boiler

b) internall" fired boiler 

c) (atural circulation boiler

d) forced circulation boiler 

1. A de$ice in which some portion of waste heat of flue gases is reco$ered to heat the air before it  passes to the furnace for combustion purpose> is #nown as a) In