Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 3

6. 

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.

A. 2000
B. 3000
C. 4500
D. 6000

Answer: Option C

Explanation:

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7. 

Advantages of use of preheated combustion air are

A. saving in fuel consumption.
B. reduction in scale losses.
C. increase in flame temperature.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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8. 

Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the

A. physical nature, ash content and fineness of the coal.
B. amount of excess air supplied and load on the boiler.
C. type of burner and combustion chamber.
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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9. 

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

A. transportation of coal.
B. drying of coal.
C. combustion of coal by supplying it around the burner.
D. preheating the primary air.

Answer: Option C

Explanation:

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10. 

The heating capacity of continuous reheating furnace depends upon the

A. hearth area and furnace temperature.
B. emissivity of the stock.
C. ratio of wall surface to stock surface.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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