FURNACE TECHNOLOGY QUIZ

Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

Increases the load on the induced draft fan

Reduces the flue gas temperature and makes the furnace atmosphere oxidising

All of these

Reduces the furnace draught

TRUE ANSWER : ?
YOUR ANSWER : ?

Which furnace employs natural draft?

Rotary kilns

Boiler

L.D. converter

Coke oven

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of pulverised coal in boilers provides

Better combustion

Higher calorific value

Less erosion on furnace wall

Smokeless burning

TRUE ANSWER : ?
YOUR ANSWER : ?

Recuperator is

Not used for fuel gas preheating

A continuous waste heat recovery equipment

An intermittant waste heat recovery equipment

Heavier than regenerator meant for the same duty

TRUE ANSWER : ?
YOUR ANSWER : ?

In order to maintain an oxidising atmosphere in a furnace, it should have

More of CO₂ in flue gas

Less of excess air

More of CO in flue gas

More of excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

Operation of blast furnace stove is based on the principles of a __________ furnace.

Both A and B

Neither A nor B

Recuperative

Regenerative

TRUE ANSWER : ?
YOUR ANSWER : ?

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

850

250

1000

650

TRUE ANSWER : ?
YOUR ANSWER : ?

In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of pulverised solid fuels

Imperfect mixing of fuel & air and infiltration of air

Use of excessive positive draft in the furnace

Use of non-preheated combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a directly fired intermittant furnace?

Tower furnace

Reverberatory furnace

Walking beam reheating furnace

Tunnel kiln

TRUE ANSWER : ?
YOUR ANSWER : ?

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

None of these

Resistance

Arc

Low frequency induction

TRUE ANSWER : ?
YOUR ANSWER : ?

↑