Gusset stays in a boiler are provided to____________________? A. prevent the bulging of flat surfaces B. avoid explosion in furnace C. prevent leakage of hot flue gases D. support furnace freely from top E. prevent atmospheric air leaking into furnace
Pour point of fuel oil is the____________________? A. lowest temperature at which oil will flow under set condition B. storage temperature C. temperature at which fuel is pumped through burners D. temperature at which oil is transported E. none of…
The behaviour of coal in a furnace is determained by_______________________? A. the content of sulphur B. the content of ash and heating valueC. the proximate analysis D. the exact analysis E. its type
Sulphur in coal results in___________________? A. causing clinkering and slagging B. corroding air heaters C. spontaneous combustion during coal storage D. facilitating ash precipitationE. all of the above
Green coal, in order to be burnt, must be____________________? A. heated sufficiently B. burnt in excess airC. heated to its ignition point D. burnt as powder E. burnt as lumps
The proximate analysis of fuel lists__________________? A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume B. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight C. fuel constituents as percents by…
The safety valve on boiler drum compared to safety valve on super heater is set at ________________? A. same valueB. higher value C. lower value D. lower/higher depending on steam flow E. unpredicatble
The three “Ts” for good combustion are____________________? A. temperature, time, and turbulance B. total air, true fuel, and turbulance C. thorough mixing, total air, and temperature D. total air, time, and temperature E. none of the above
Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________? A. higher effectiveness of boiler B. high calorific value coal being burntC. fouling of heat transfer surfaces D. raising of steam temperature…
The capacity of induced draft fan compared to forced draft fan in a boiler is__________________? A. sameB. more C. less D. less or more depending on size of boiler E. unpredictable