FURNACE TECHNOLOGY QUIZ

Protective gas used in the annealing furnace for steel coil comprises of

95% N₂ + 5% H₂

100 %H₂

100% CO

5% H₂ + 9% N₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Dampers are located

Before the I.D fan

After the I.D. fan

Near the top of the chimney

Anywhere after the I.D. fan

TRUE ANSWER : ?
YOUR ANSWER : ?

Overfire burning in a furnace is a phenomenon characterised by

Supply of excess air

Supply of excess fuel

Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Very high pressure boilers are usually __________ boilers.

Natural circulation

Water tube

Waste heat

Fire tube

TRUE ANSWER : ?
YOUR ANSWER : ?

Circulation of gases in furnace is caused by the

Difference in density between hot and cold gases

Change in volume during a change of temperature

Furnace pressure in conjunction with draft in flues

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

< 5

< 8

< 2

< 10

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators as compared to recuperators for the same duty

Store smaller quantity of waste heat

Are lighter & compact

Involve higher initial cost

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following variables does not affect the furnace capacity?

Ratio of wall surface to surface of stock

Gas velocity in furnace

Size of the furnace

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Thermal conductivity of the charge & structural materials of furnace

All of these

Rate of firing and emissivity of flame

Nature of process ; whether batch, continuous or intermittant

TRUE ANSWER : ?
YOUR ANSWER : ?

Scaling of furnace stock is reduced by __________ in flue gas.

H₂

High CO/CO₂

All of these

CO

TRUE ANSWER : ?
YOUR ANSWER : ?