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9. 10. Which of the following would NOT be considered a continous load? electric furnace in a home electric range in a home electric range in a restaurant snow-melting cables buried in driveway concrete 12. a. b. C. d. On a two-element water heater, which element is controlled by an interlocking. or snap-over, type of thermostat? a. b. C. d. 11. For three or more conductors, the required "percent fill" value for conduit and tubing is %. a. b. C. d. neither both the top the bottom نن من Regarding water heaters, the time needed to bring the water temperature to satisfactory levels in a given length of time is best termed 40 48 a. cycle speed 53 58 b. heating interval C. speed of recovery a. b. d. reduction rate C. d. 13. Using the information from Table 18-4, determine the area for 40% fill for 2-inch EMT. .82 square inches 1.04 square inches 1.34 square inches 1.78 square inches
14. a. b. c. d. a. b. نن من 15. Reduction factors cited for raceways with more than three current-carrying conductors need NOT apply when the grouped or bundled conductors are less C. d. The purpose of cathodic protection in water heaters is to prevent corrosion overheating shock hazards bacterial growth a. b. a. b. C. a. b. C. d. d. than ي C. d. 16. Most residential water heaters use steel tanks lined with 12 inches 24 inches 4 feet 6 feet 17. High temperature correction factors are necessary when conductors are installed in a place such as a boiler room where the ambient temperature is higher than °F. copper glass aluminum. plastic 18. How long does it take an adult exposed to 140°F (60°C) moving water to get a serious burn? 80 86 95 105 about 2 minutes about 30 seconds about 15 seconds about 5 seconds
19. The jet pump motor described in Chapter 19 of your reading material has a rating of amperes at volts. 8, 120 8, 230 C. 10, 120 d. 10, 230 a. b. 20. In the workshop example, two empty EMT raceways are used to support a panel provide drainage provide grounding provide for future wiring needs a. b. C. d.