Steam Boilers

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

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 above

A. the content of sulphur
B. the content of ash and heating value
C. the proximate analysis
D. the exact analysis
E. its type

A. causing clinkering and slagging
B. corroding air heaters
C. spontaneous combustion during coal storage
D. facilitating ash precipitation
E. all of the above

A. heated sufficiently
B. burnt in excess air
C. heated to its ignition point
D. burnt as powder
E. burnt as lumps

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 volume of moisture, volatile, fixed carbon and ash
D. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
E. moisture and ash free heating value

A. same value
B. higher value
C. lower value
D. lower/higher depending on steam flow
E. unpredicatble

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

A. higher effectiveness of boiler
B. high calorific value coal being burnt
C. fouling of heat transfer surfaces
D. raising of steam temperature
E. leakage of air

A. same
B. more
C. less
D. less or more depending on size of boiler
E. unpredictable