FURNACE TECHNOLOGY QUIZ

Oxygen enrichment of combustion air does not result in increase of the

Flame temperature

Heat transfer rate in the furnace

Stack loss

Oxygen in the flue gas

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

44119

45-50

65-70

TRUE ANSWER : ?
YOUR ANSWER : ?

Very high pressure boilers are usually __________ boilers.

Fire tube

Waste heat

Water tube

Natural circulation

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ furnace is not an electric furnace.

Resistance

Induction

Arc

Pot

TRUE ANSWER : ?
YOUR ANSWER : ?

Unit of furnace loading is

Ton stock/hr

Ton stock/hr/m² hearth area

Ton stock/m² hearth area

Both B and C

TRUE ANSWER : ?
YOUR ANSWER : ?

Reheating furnace (pusher type) is used for heating

Slabs

Steel coils

Steel sheets

Ingots

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one is not an induced draught furnace?

None of these

High pressure boiler

Sintering furnace

Blast furnace stove

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a natural draft furnace?

Sintering furnace

None of these

Blast furnace stoves

Power plant boilers

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

Causing metal embrittlement

Accelerating the rate of scaling

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Thick firebed and preheated primary air

All of these

Low forced draft & fuel bed temperature

Low reactivity of carbonised residue containing high proportion of iron & sulphur

TRUE ANSWER : ?
YOUR ANSWER : ?