CHAPTER 10 FIRED FURNACE TEST
1. The flow of air through a furnace is referred to as:
a. suction
b. draft
c. air velocity
d. O2 %
2. The amount of combustibles in the flue gas:
a. O2 %
b. percent combustibles
c. flue gas range
d. flue gas concentration
3. Furnaces are classified as:
a. balanced draft
b. indirect and direct
c. forced draft
d. induced draft
4. When a burner flame goes out during operation it is referred to as:
a. flame out
b. burn out
c. fire out
d. flash back
5. Air can enter the furnace through:
a. d. g.
b. e.
c. f.
6. Carbon deposits are most likely to be found in the:
a. convection section terminal penetrations
b. pre-heat tube
c. radiant tube
d. convection tube
7. The term applied to gas vapors when they ignite and return back to the source:
a. flashback
b. auto ignition
c. back draft
d. ignition point
8. List four fired heater “ furnace” designs:
a.
b.
c.
d.
9. Ensuring proper air concentration is critical because:
a. fuel burns cleaner and hotter if air mixture is correct
b. fuel burns cleaner and hotter if air mixture is incorrect
c. fuel burns poorly and cooler if air mixture is incorrect
d. a & c
e. b & c
10. Tubes located above the shock bank:
a. conduction tubes
b. radiant tubes
c. convection tubes
d. bridgewall tubes
11. Name four common furnace problems and describe each.
a.
b.
c.
d.
12. Draw a cylinder furnace with balanced draft. Identify the components.
13. Heat transfer occurs best under what three conditions:
a.
b.
c.
14. Complete CH4 + 2O2 combustion produces _____ and _______ .
15. Methane as a fuel has a fuel heat value of:
a. 274 Btu/Cu.ft
b. 374 Btu/Cu.ft
c. 574 Btu/Cu.ft
d. 909 Btu/Cu.ft
16. Draw a cabin furnace with radiant wall burners and induced draft. Show all
components.
17. Draw a natural draft, box furnace. Show all components.
18. Convective heat transfer accounts for:
a. 30% to 40%
b 40% to 50%
c. 60% to 70%
d. 70% to 80%
19. An air preheater is a:
a. Cost saving system used to heat the air before it enters the burner
b. Device located at the burner tip
c. Narrow neck between the convection section and stack
d. Type of furnace that heats air before it mixes with fuel at burner
20. A stationary or movable device used to remove unburned hydrocarbons from the upper
section of the furnace:
a. radiant nozzle
b. convection blower
c. air register
d. soot blower
21. When a furnace tube or section of refractory gets too hot:
a. flame impingement
b. scorching
c. hot spot
d. shock bank
22. The air registers are located on the:
a. burner
b. fuel line
c. steam line
d. peep block
23. Carbon deposits found inside furnace tubes:
a. carbonization
b. fouling
c. coking
d. mineral deposits
24. The refractory lining on a furnace is composed of all of the following except:
a. insulation fire brick e. gunite
b. stainless steel rod f. concrete
c. kick-out panels g. lead rods
d. insulative bats h. peep block
25. The section of the furnace that reaches the highest temperature is the:
a. convection section
b. radiant section
c. shock bank
d. firebox
26. Most fired furnaces use:
a. natural gas
b. kerosene
c. fuel oil
d. a & c
27. Hydrogen as a fuel has a fuel heat value of:
a. 274 Btu/Cu.ft
b. 374 Btu/Cu.ft
c. 574 Btu/Cu.ft
d. 909 Btu/Cu.ft
28. Temperatures in a furnace range between:
a. 1000F to 1350F
b. 400F to 900F
c. 2000F to 2600F
d. 1600F to 2000F
29. The stack damper in a furnace is set to give from:
a. 0.05 to 0.15 inches of water
b. 0.15 to 0.25 inches of water
c. 0.25 to 0.35 inches of mercury
d. 0.35 to 0.45 inches of water
30. Direct fired furnaces heat process streams like heavy hydrocarbons, glycol, water, and
molten salts.
a. true
b. false
31. Radiant heat transfer accounts for:
a. 30% to 40%
b 40% to 50%
c. 60% to 70%
d. 70% to 80%
32. Gas flow out of a furnace is typically set at:
a. 150,000 pounds per hour
b. 250,000 pounds per hour
c. 350,000 pounds per hour
d. 450,000 pounds per hour
33. Four draft types utilized on furnace designs are:
a.
b.
c.
d.
34. Label the following furnace.
34-1 34-6 34-11
34-2 34-7 34-12
34-3 34-8 34-13
34-4 34-9 34-14
34-5 34-10 34-15
34-16 31-22 31-28
34-17 31-23 31-29
34-18 31-24 31-30
34-19 31-25 31-31
34-20 31-26 31-32
34-21 31-27
Answer Chapter Ten Fired Heaters