Online Test on Blast Furnace Technology - Set 03 - ObjectiveBooks

Online Test on Blast Furnace Technology - Set 03

Practice Test: Question Set - 03

1. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
    (A) Preheating the combustion air
    (B) Oxygen enrichment of combustion air
    (C) Preheating the fuel gas
    (D) All (a), (b) & (c)

2. Which of the following is a periodic furnace?
    (A) Tunnel kiln
    (B) Rotary kiln
    (C) Soaking pit
    (D) Reheating furnace

3. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
    (A) Premix
    (B) Outside mixing type
    (C) Rotary
    (D) Diffusion

4. Pulverised fuel fired furnaces employ __________ fuel firing.
    (A) Horizontal
    (B) Vertical
    (C) Tangential
    (D) All (a), (b) and (c)

5. Heat balance of furnace provides means of determining the
    (A) Thermal efficiency of the process
    (B) Sources of heat losses
    (C) Scope of reduction of heat losses
    (D) All (a), (b) and (c)

6. Main gas valve in a gaseous fuel burner is a __________ valve.
    (A) Gate
    (B) Butterfly
    (C) Globe
    (D) None of these

7. Means for giving direction to the circulation of gases in furnaces are
    (A) Fans
    (B) Arrangement of heating stock in the furnaces
    (C) Location of outlet ports and heating & combustion devices
    (D) All (a), (b) and (c)

8. Turn down ratio of a burner
    (A) Should be as low as possible i.e., 1 : 2
    (B) Should be 1:1 for a batch type furnace
    (C) Is the ratio of maximum to minimum permissible heat input rates
    (D) Is normally much more for a continuous furnace as compared to a batch furnace

9. 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

10. Which is not a hearth furnace?
    (A) Glass tank furnace
    (B) Open hearth furnace
    (C) Cupola
    (D) Reheating furnace

11. Which of the following accentuates clinkering troubles on furnace grate burning coal?
    (A) Low reactivity of carbonised residue containing high proportion of iron & sulphur
    (B) Low forced draft & fuel bed temperature
    (C) Thick firebed and preheated primary air
    (D) All (a), (b) and (c)

12. Combustion of fuel in a furnace with oxygen enriched air results in higher
    (A) Flue gas volume
    (B) Flame temperature
    (C) Fuel consumption
    (D) Stack loss

13. Cement Kiln is a
    (A) Rotary Kiln
    (B) Tunnel Kiln
    (C) Natural draft furnace
    (D) Batch furnace

14. Regenerators compared to the recuperators for the same duty
    (A) Occupy more space
    (B) Are less costly
    (C) Are of smaller size
    (D) All (a), (b) and (c)

15. Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
    (A) Coke oven
    (B) Blast furnace stoves
    (C) Beehive coke oven
    (D) High pressure boiler

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