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Furnace Technology Online Exam Quiz

Important questions about Furnace Technology. Furnace Technology MCQ questions with answers. Furnace Technology exam questions and answers for students and interviews.

1. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.


A : 50

B : 100

C : 150

D : 250

2. The method of Lobo and Evans is concerned with the calculation of the


A : heat absorption in radiant section of a furnace.

B : heat transfer by forced convection in a reboiler.

C : heat transfer in vacuum condensers.

D : mass transfer co-efficient.

3. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a


A : furnace employing neutral atmosphere.

B : carbon resistance furnace.

C : reducing atmosphere.

D : furnace employing negative pressure.

4. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the


A : Ostwald chart

B : Cox chart

C : Sankey diagram

D : none of these

5. Which furnace employs natural draft?


A : Coke oven

B : Boiler

C : Rotary kilns

D : L.converter

6. Turndown ratio of a burner gives an idea of the __________ in the furnace.


A : range of fuel firing rates

B : volume of the combustion chamber

C : maximum heat input rate only

D : minimum heat input rate only

7. Regenerators are used for waste heat recovery in


A : by-product coke ovens

B : beehive coke oven

C : blast furnace stoves

D : soaking pits

8. Dampers are located


A : before the I.D fan

B : after the I.D. fan

C : near the top of the chimney

D : anywhere after the I.fan

9. Reverberatory furnace is used for


A : roasting/reduction of ores

B : annealing steel coil

C : heating air

D : steel melting

10. Protective gas used in the annealing furnace for steel coil comprises of


A : 95% N 2 + 5% H 2

B : 5% H 2 + 9% N 2

C : 100% CO

D : 100 %H 2

1. Reducing atmosphere is maintained in a


A : calcination kiln

B : blast furnace

C : soaking pit

D : L.converter

2. Which one shows the diagramatic heat balance in a furnace?


A : Sankey diagram

B : Cox chart

C : Ostwald chart

D : None of these

3. Artificial draught produced by a fan in the furnace can be controlled by the


A : speed of the fan.

B : damper.

C : variation in the pitch of fan blades.

D : all (a), (b) and (c).

4. Size of the combustion chamber of a furnace depends upon the


A : heat release rate of the fuel.

B : preheat temperature of fuel & air.

C : method of mixing the fuel & air.

D : all (a), (b) and (c).

5. Pot furnace which is either regenerative or recupterative, is used in the manufacture of


A : glass

B : stainless steel

C : potteries

D : refractory bricks.

6. Which of the following is a rotary furnace?


A : Lime kiln

B : Soaking pit

C : Stoves

D : Annealing furnace.

7. Regenerators as compared to recuperators for the same duty


A : store smaller quantity of waste heat

B : are lighter & compact

C : involve higher initial cost

D : all (a), (b) & (c)

8. In order to maintain an oxidising atmosphere in a furnace, it should have


A : more of excess air

B : less of excess air

C : more of CO in flue gas

D : more of CO 2 in flue gas

9. In a furnace operation, which is not preheated?


A : Solid fuels.

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

C : Both (a) and (b).

D : Neither (a) nor (b).

10. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.


A : < 2

B : < 5

C : < 8

D : < 10

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