Chemical Furnace Technology Basic Questions - Set 09 - ObjectiveBooks

Chemical Furnace Technology Basic Questions - Set 09

Practice Test: Question Set - 09

1. Large tonnage of refractory bricks are dried in a
    (A) Shaft furnace
    (B) Rotary hearth furnace
    (C) Tunnel kiln
    (D) Muffle furnace

2. Specific heating capacity of a furnace is expressed as
    (A) Weight heated/hr
    (B) Weight heated/furnace volume
    (C) Weight heated/hr/furnace volume
    (D) None of these

3. A refractory wall separating the stock and the source of heat is provided in a
    (A) Updraft kiln
    (B) Muffle furnace
    (C) Continuous furnace
    (D) None of these

4. Coke ovens in steel plant are heated by
    (A) Electricity
    (B) Blast furnace gas/mixed gas
    (C) Coke oven gas
    (D) Both (b) and (c)

5. 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

6. 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)

7. Which is a continuous furnace?
    (A) Coke ovens
    (B) Annealing furnace
    (C) Glass tank furnace
    (D) None of these

8. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Cannot be predicted

9. Overfire burning in a furnace is a phenomenon characterised by
    (A) Supply of excess fuel
    (B) Supply of excess air
    (C) Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
    (D) None of these

10. The reason for excessive clinker formation in gas producers is the
    (A) Use of coal/coke containing a high % of fines and ash
    (B) Use of fuel having too low an ash fusion temperature
    (C) Development of hot spots in the fuel bed and an abnormally high rate of gasification
    (D) All (a), (b) and (c)

11. Regenerators are normally provided in the
    (A) Glass melting furnace
    (B) Open hearth furnace
    (C) By product coke ovens
    (D) All (a), (b) and (c)

12. The rate of scaling of furnace stock depends upon the
    (A) Temperature
    (B) Time
    (C) Nature of atmosphere
    (D) All (a), (b) and (c)

13. Which furnace employs preheating, heating and soaking zones?
    (A) Soaking pit
    (B) Reheating furnace
    (C) Open hearth furnace
    (D) Cupola

14. In low or standard frequency induction furnace, heat is produced by the
    (A) Combination of induced current and skin effect
    (B) Induction and resistance
    (C) Current flow through a heating element
    (D) None of these

15. Fuel economy in an industrial furnace operation cannot be achieved by the use of
    (A) Stoichiometric combustion air
    (B) Non-preheated combustion air
    (C) Combustion air not enriched with oxygen
    (D) Recuperators

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