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Practice Exam
As with the Chapter Review Tests and the Final Exam, the Practice Exam tests your understanding of the materials underlying the learning objectives. After you’ve reviewed your answers to the Chapter Review Tests, try your hand at this 50-question Practice Exam to become still more comfortable with taking a multiple-choice test. Remember, topics covered in this exam may likewise be covered in the Final Exam, but the wording of the questions will never be identical.
- The boiler operator should watch at all times for all of the following except :
a. leaks in steam, water, and fuel connections. b. proper fuel air ration. c. operating pressures and temperatures. d. incoming water quality.
- One advantage of hydronic heating over steam heating is:
a. condensate returns are smaller. b. less building damage may result from a leak. c. piping pitch or slope is not as critical. d. pressure and temperature are easily controlled.
- When steam or hot water is used as the heat source in a secondary warm air heating system, the system may be classified as a: a. direct-fired boiler. b. fin-coil heat exchanger. c. vertical forced air. d. low-boy air.
- Boilers that have hot gases circulating through tubes surrounded by water are called:
a. firetube boilers. b. high pressure boilers. c. low pressure boilers. d. watertube boilers.
- The type of ventilation system that forces fresh air into the building by a fan and moves stale air out through outlets in outside walls or the roof is called: a. forced air. b. makeup ventilation. c. natural balancing pressure. d. mechanical air intake/natural exhaust.
- (Fill in the blank) A silver spoon placed in hot coffee quickly becomes too hot to handle. The spoon is heated by __. a. conduction b. convection c. radiation d. None of the above.
- Boiler furnace explosions are likely to occur for all of the following reasons except :
a. a weak pilot flame. b. low fuel pressure. c. insufficient combustion air. d. insufficient purge of the furnace before startup.
- All of the following boiler fittings are required on hot water heating boilers except :
a. a pressure or altitude gauge. b. a safety relief valve. c. a shut-off valve. d. a water gauge glass and column.
- ABC company burns hydrocarbons to generate electricity for its operations. What are the two most common byproducts of hydrocarbon combustion? a. carbon monoxide and sulfur b. carbon monoxide and water c. carbon dioxide and sulfur d. carbon dioxide and water
- All of the following could cause a V-belt to fray, crack, or wear except :
a. loose belt tension. b. incorrect pulley sizes. c. pulleys out of alignment. d. shafts not parallel.
- In all steam heating systems, the vertical steam supply pipes are called:
a. risers. b. returns. c. upfeeds. d. wet lines.
- The most common cause of feeder or low-water fuel cut-off trouble is the operator’s failure to observe the: a. blow-down instructions. b. fuel calibration sequence. c. water treatment limitations. d. low-water control calibration.
- The directions on a bottle of cleaning fluid call for an 8:1 ratio of water to full-strength fluid. How many gallons of ready-to-use solution will one quart of full strength fluid yield? (1 gallon = 4 quarts) a. 2.0 gal. b. 2.25 gal. c. 8.25 gal. d. 9.0 gal.
- The greatest benefit of the dry method of laying up a boiler is it:
a. prevents freezing. b. minimizes corrosion. c. minimizes oxidation. d. eliminates off-season leaking.
- The control used on gas- and oil-fired heating boilers to provide for proper sequencing of the combustion controls during startup and shutdown is the: a. limit control. b. capacity control. c. programming control. d. safety control.
- A volute is part of a:
a. centrifugal pump. b. gear pump. c. hose pump. d. plunger pump.
- Some steam heating systems operate under a vacuum in order to:
a. prevent steam leaks. b. use steam with a temperature above 212ºF. c. use steam with a temperature below 212ºF. d. prevent air from entering the steam heating system.
- The amount of heat necessary to convert 100 lbs. of ice at 32ºF to water at 132ºF is:
a. 10,000 Btu. b. 24,400 Btu. c. 14,400 Btu. d. 10,050 Btu.
- The uneven expansion of cold metal when subjected to high heat is referred to as:
a. stress fatigue. b. thermal shock. c. conduction cracking. d. metallic heat failure.
- The three fundamental units of measurement in physical mechanics are:
a. acceleration, time, and mass. b. length, width, and height. c. time, length, and force. d. time, velocity, and mass.
- The smallest type of expansion tank is the:
a. diaphragm expansion tank. b. open expansion tank. c. closed expansion tank. d. conventional expansion tank.
- The scale on a pressure gauge dial should be graduated with a range up to:
a. 1½ to 3 times the working pressure. b. the maximum working pressure. c. 5 times the working pressure. d. ½ the working pressure.
- Trimming an impeller should result in a(n):
a. reduction of noise. b. decrease of power consumption. c. improvement of a cavitation problem. d. increase in pump horsepower.
- The metric to USCS conversion factor for meters to feet is 3.281. Convert 20 meters to feet. a. 164.0 ft. b. 72.9 ft. c. 65.6 ft. d. 6.1 ft.
- For facilities that require short-term operation where quick warm-up is required, the least responsive type of boiler to use is the: a. tubular boiler. b. electrical boiler. c. firetube boiler. d. watertube boiler.
- The most common type of firetube boiler used for heating large buildings is the:
a. cast-iron. b. high pressure. c. modified Scotch. d. modular.
- The unit of measurement a compound pressure gauge uses to measure pressures below atmospheric pressure is: a. inches of mercury. b. inches of water. c. pounds per square inch. d. pounds per square inch gauge.
- Routine operation and maintenance of a hydronic heating system should include all the following except : a. confirming that automatic air vents are functional. b. checking level of air cushion in expansion tank. c. lubricating pump motors. d. lubricating condensate pump.
- A pump affects the pressure of a fluid or gas by:
a. raising pressure. b. reducing pressure. c. regulating pressure. d. stabilizing pressure.
- The steam boiler component used to lower the concentration of dissolved impurities in the boiler water is the: a. blow-off connection. b. deconcentrator. c. feed connection. d. sediment reduction valve.
- To reduce corrosion in large hydronic heating systems, a gas cushion is recommended in the expansion tank consisting of: a. oxygen. b. hydrogen. c. nitrogen. d. soluble gas.
- What is the maximum allowable working pressure of a boiler during hydrostatic testing?
a. 100% b. 125% c. 150% d. 200%
- If a 20-tooth pinion is turning at 120 rpm and the driven gear has 60 teeth, the driven gear is turning at: a. 1 rpm. b. 30 rpm. c. 40 rpm. d. 360 rpm.
Practice Exam Answers
1. B
2. A
3. D
4. A
5. C
6. D
7. D
8. C
9. B
10. A
11. D
12. A
13. B
14. D
15. D
16. B
17. A
18. A
19. D
20. D
21. A
22. C
23. A
24. A
25. B
26. A
27. C
28. A
29. C
30. A
31. B
32. C
33. A
34. A
35. B
36. C
37. A
38. C
39. A
40. A
41. B
42. C
43. C
44. A
45. D
46. A
47. A
48. C
49. C
50. C
