FURNACE TECHNOLOGY QUIZ

Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

Ammonia

Alkaline powders

None of these

Fine dolomite

TRUE ANSWER : ?
YOUR ANSWER : ?

An example of indirectly heated furnace is the

Reheating furnace

Soaking pit

Muffle furnace

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Air preheater

Steam superheater

All of these

Economiser

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer rate to the charge/stock in a furnace does not depend upon the

Type of fuels viz solid, liquid or gaseous

Flue gas temperature

Initial temperature of the charged stock

Emissivity of refractory walls

TRUE ANSWER : ?
YOUR ANSWER : ?

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

Corrosive nature of the waste gas

Dust concentration & nature of dust in waste gas

All of these

Quantity & temperature of waste gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Cement Kiln is a

Tunnel Kiln

Natural draft furnace

Batch furnace

Rotary Kiln

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 : ?

While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.

4500

6000

3000

2000

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators as compared to recuperators for the same duty

All of these

Involve higher initial cost

Are lighter & compact

Store smaller quantity of waste heat

TRUE ANSWER : ?
YOUR ANSWER : ?

Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.

25-30

65-70

45-50

44119

TRUE ANSWER : ?
YOUR ANSWER : ?

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