FURNACE TECHNOLOGY QUIZ

In reverberatory furnace, charge is heated mainly by

None of these

Conduction

Radiation of heat from the roof of the combustion chamber

Natural convection

TRUE ANSWER : ?
YOUR ANSWER : ?

Soaking pits are meant for heating steel

Ingots

Coils

Slabs

Sheets

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of an open hearth furnace may be about __________ percent.

80

5

50

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Which furnace employs natural draft?

Coke oven

L.D. converter

Boiler

Rotary kilns

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

Transportation of coal

Preheating the primary air

Combustion of coal by supplying it around the burner

Drying of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Positive pressure exists in the furnace

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

None of these

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a periodic furnace?

Tunnel kiln

Rotary kiln

Soaking pit

Reheating furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace operation, which is not preheated?

Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

Solid fuels

Both A and B

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

In low or standard frequency induction furnace, heat is produced by the

None of these

Combination of induced current and skin effect

Current flow through a heating element

Induction and resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

130

180

80

250

TRUE ANSWER : ?
YOUR ANSWER : ?