FURNACE TECHNOLOGY QUIZ

The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

50

85

65

99

TRUE ANSWER : ?
YOUR ANSWER : ?

The function of an economiser in a boiler is to preheat the

Pulverised coal

Furnace oil

Combustion air

Feedwater

TRUE ANSWER : ?
YOUR ANSWER : ?

Shaft furnaces are used for

All of these

Calcining

Roasting

Smelting

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an

Steam boiler

Salt bath furnace

Blast furnace

Annealing furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Low stack loss indicates the

Oxygen enrichment of combustion air

Use of sub-stoichiometric air for combustion

Efficient use of fuel

Inefficient use of fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

Increase in flame temperature

Reduction in scale losses

Saving in fuel consumption

Increase in calorific value of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

The reason for excessive clinker formation in gas producers is the

Use of fuel having too low an ash fusion temperature

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

All of these

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Specific heating capacity of a furnace is expressed as

None of these

Weight heated/hr/furnace volume

Weight heated/furnace volume

Weight heated/hr

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators are normally provided in the

By product coke ovens

Glass melting furnace

Open hearth furnace

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.

Sidefired

Underfired

Covered

Recirculating

TRUE ANSWER : ?
YOUR ANSWER : ?