FURNACE TECHNOLOGY QUIZ

Blast furnace stoves are meant for heating

Steam

Blast furnace gas

Air

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Reheating furnace (pusher type) is used for heating

Slabs

Steel sheets

Ingots

Steel coils

TRUE ANSWER : ?
YOUR ANSWER : ?

Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

Low emissivity

Both A and B

High thermal conductivity

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

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

More of CO₂ in flue gas

More of excess air

More of CO in flue gas

Less of excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

The reason for excessive clinker formation in gas producers is the

Use of coal/coke containing a high % of fines and ash

All of these

Use of fuel having too low an ash fusion temperature

Development of hot spots in the fuel bed and an abnormally high rate of gasification

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

60

40

5

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Forced recirculation of furnace gases is practised

To ensure uniform temperature

To increase heat transfer by convection

All of these

In furnaces, operating below 750°C

TRUE ANSWER : ?
YOUR ANSWER : ?

Pot furnace which is either regenerative or recupterative, is used in the manufacture of

Stainless steel

Potteries

Refractory bricks

Glass

TRUE ANSWER : ?
YOUR ANSWER : ?

Recuperator is

An intermittant waste heat recovery equipment

Heavier than regenerator meant for the same duty

Not used for fuel gas preheating

A continuous waste heat recovery equipment

TRUE ANSWER : ?
YOUR ANSWER : ?

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

Preheating the fuel gas

Preheating the combustion air

Oxygen enrichment of combustion air

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?