Test: Fuels & Combustion - 2 - Mechanical Engineering MCQ

to get high burning rate

to keep the burning losses to minimum

for coals with high ash content

for coals which have high heating value

Economical in cost

Minimum sulphur content

High ignition point

High heating value

aids in proper combustion

has high corrosive effect

facilitates ash removal

lowers the ignition point

0₂

water vapours

CO

C0₂

3 and 4

2 and 3

1 and 2

1 and 4

A

B

C

D

1 N/cm²

10N/m²

100 N/m²

1 N/mm²

maintain a flow of air through the fuel bed and aid in the proper combustion of fuel.

draw the resulting hot gases through the system.

force the spent up flue gases towards the chimney and then to atmosphere.

all of the above

nature of fuel and its depth on the grate

rate at which combustion is required to take place

method of burning of fuel

resistance in the flue gas circuit

Chimney needs no auxiliary power for its operation.

Amount of draught produced increases with increase in outside air temperature.

Lower the temperature of furnace gases, greater will be chimney draught.

No flexibility in creating more draft to take peak loads.