Mechanical Engineering Mcqs

A. carbon, hydrogen, nitrogen, sulphur, moisture
B. fixed carbon, ash, volatile matter, moisture
C. higher calorific value
B. lower calorific value
E. best analysis

A. all the fuel burns instantaneously producing high energy release
B. fuel burns with less air
C. coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D. explosion in furnace
E. none of the above

A. increases steam pressure
B. increases steam flow
C. decreases fuel consumption
D. decreases steam pressure
E. increases life of boiler

A. has high heating value
B. retards electric precipitation
C. promotes complete combustion
D. has highly corrosive effect
E. facilitates ash removal

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