FURNACE TECHNOLOGY QUIZ

Rotary kilns are used in the

Calcination of limestone & dolomite

Both A and B

Neither A nor B

Cement manufacture

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

Combustion of coal by supplying it around the burner

Transportation of coal

Preheating the primary air

Drying of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?

Erosion of induced draft fan blades

Higher power consumption in its transportation

Ash disposal problem

Excessive fly ash discharge from the stack

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Low reactivity of carbonised residue containing high proportion of iron & sulphur

Thick firebed and preheated primary air

All of these

Low forced draft & fuel bed temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Power required in case of forced draught as compared to induced draught (for the same draught produced) is

Either more or less; depends on the flue gas density Answer: Option B

Less

Same

More

TRUE ANSWER : ?
YOUR ANSWER : ?

Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

650

1000

250

850

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a rotary furnace?

Lime kiln

Soaking pit

Annealing furnace

Stoves

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a natural draft furnace?

Power plant boilers

Sintering furnace

Blast furnace stoves

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A refractory wall separating the stock and the source of heat is provided in a

Updraft kiln

Muffle furnace

Continuous furnace

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Furnace pressure is normally controlled by regulating the

Fuel gas pressure

Damper

Speed of I.D. fan

Air pressure

TRUE ANSWER : ?
YOUR ANSWER : ?