Furnace Technology Multiple Choice Questions - Set 08 - ObjectiveBooks

Furnace Technology Multiple Choice Questions - Set 08

Practice Test: Question Set - 08

1. Soaking pits are meant for heating steel
    (A) Ingots
    (B) Coils
    (C) Sheets
    (D) Slabs

2. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
    (A) 350
    (B) 750
    (C) 1050
    (D) 1250

3. Pot furnace which is either regenerative or recuperative, is used in the manufacture of
    (A) Glass
    (B) Stainless steel
    (C) Potteries
    (D) Refractory bricks

4. In reverberatory furnace, charge is heated mainly by
    (A) Conduction
    (B) Natural convection
    (C) Radiation of heat from the roof of the combustion chamber
    (D) None of these

5. Very high pressure boilers are usually __________ boilers.
    (A) Fire tube
    (B) Water tube
    (C) Waste heat
    (D) Natural circulation

6. Which one shows the diagrammatic heat balance in a furnace?
    (A) Sankey diagram
    (B) Cox chart
    (C) Ostwald chart
    (D) None of these

7. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
    (A) 20
    (B) 40
    (C) 60
    (D) 80

8. In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
    (A) Recuperator
    (B) Regenerator
    (C) Waste heat boiler
    (D) None of these

9. 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)

10. ________ atmosphere is maintained inside an iron blast furnace.
    (A) Oxidizing
    (B) Reducing
    (C) Inert
    (D) Decarburising

11. Maximum thermal efficiency of boiler may be about ________ percent.
    (A) 10
    (B) 25
    (C) 65
    (D) 90

12. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
    (A) Sidefired
    (B) Underfired
    (C) Covered
    (D) Recirculating

13. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
    (A) 20
    (B) 40
    (C) 65
    (D) 80

14. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
    (A) Ash disposal problem
    (B) Excessive fly ash discharge from the stack
    (C) Higher power consumption in its transportation
    (D) Erosion of induced draft fan blades

15. Unit of furnace loading is
    (A) Ton stock/hr/m2 hearth area
    (B) Ton stock/hr
    (C) Ton stock/m2 hearth area
    (D) Both (b) and (c)

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