Online Chemical Engineering Test - Furnace Technology Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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Ostwald charts are meant for

computing the excess/deficiency of combustion air.

calculation of flue gas temperature.

computation of flue gas analysis.

none of these.

[#]

Means for giving direction to the circulation of gases in furnaces are

fans.

arrangement of heating stock in the furnaces.

location of outlet ports and heating & combustion devices.

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

[#]

In order to maintain a reducing atmosphere in a furnace, it should have

no O₂ in flue gas

CO in flue gas

high excess air

none of these

[#]

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

emissivity of the refactory walls.

size of the furance.

use of waste heat recovery equipments.

thickness of the stock.

[#]

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

250

650

850

1000

[#]

Power required in case of forced draught as compared to induced draught (for the same draught produced) is

same

less

either more or less; depends on the flue gas density

[#]

Reverberatory furnace is used for

roasting/reduction of ores

annealing steel coil

heating air

steel melting

[#]

Forced recirculation of furnace gases is practised

to increase heat transfer by convection.

to ensure uniform temperature.

in furnaces, operating below 750°C.

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

[#]

Scaling of furnace stock is reduced by __________ in flue gas.

H₂

high CO/CO₂

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

[#]

10.

Very high pressure boilers are usually __________ boilers.

fire tube

water tube

waste heat

natural circulation

[#]

11.

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

range of fuel firing rates

volume of the combustion chamber

maximum heat input rate only

minimum heat input rate only

[#]

12.

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

10-15

25-30

45-50

65-70

[#]

13.

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

100

150

250

[#]

14.

__________ furnace is not an electric furnace.

Arc

Induction

Pot

Resistance.

[#]

15.

Main gas valve in a gaseous fuel burner is a __________ valve.

gate

butterfly

globe

none of these

[#]

16.

Unit of furnace loading is

ton stock/hr/m² hearth area

ton stock/hr

ton stock/m² hearth area

both (b) and (c)

[#]

17.

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

speed of the fan.

damper.

variation in the pitch of fan blades.

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

[#]

18.

Which of the following is a rotary furnace?

Lime kiln

Soaking pit

Stoves

Annealing furnace.

[#]

19.

Regenerators as compared to recuperators for the same duty

store smaller quantity of waste heat

are lighter & compact

involve higher initial cost

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

[#]

20.

Recuperator is

not used for fuel gas preheating.

an intermittant waste heat recovery equipment.

a continuous waste heat recovery equipment.

heavier than regenerator meant for the same duty.

[#]

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Online Chemical Engineering Test - Furnace Technology Test

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