FURNACE TECHNOLOGY QUIZ

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

850

250

1000

650

TRUE ANSWER : ?
YOUR ANSWER : ?

hich is the most thermally efficient furnace?

Boiler furnace

Reheating furnace

Reverberatory furnace

Rotary kilns

TRUE ANSWER : ?
YOUR ANSWER : ?

Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an

Steam superheater

Air preheater

Economiser

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace employing forced draught as compared to induced draught,

Positive pressure exists in the furnace

None of these

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

The fan operates hot and hence blades are liable to corrosion and erosion

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

20

65

40

80

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace stoves are meant for heating

Air

Steam

None of these

Blast furnace gas

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 is not a continuous waste heat recovery equipment from the flue gases going out of furnace?

Ceramic recuperator

Regenerator

Economiser

Waste heat boiler

TRUE ANSWER : ?
YOUR ANSWER : ?

Specific heating capacity of a furnace is expressed as

Weight heated/hr/furnace volume

None of these

Weight heated/hr

Weight heated/furnace volume

TRUE ANSWER : ?
YOUR ANSWER : ?

Turn down ratio of a burner

Should be as low as possible i.e., 1 : 2

Is normally much more for a continuous furnace as compared to a batch furnace

Is the ratio of maximum to minimum permissible heat input rates

Should be 1:1 for a batch type furnace.

TRUE ANSWER : ?
YOUR ANSWER : ?