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Master Examination Practice Drill #6 2011

Master Examination Practice Drill #6 2011. Where a hotel has a stationary electric sign installed inside a decorative fountain, the sign shall be at LEAST ______ inside the fountain, when measuring from the outside edges of the fountain. 2 feet 3 feet 4 feet 5 feet. 1. D 680.57(C)(1).

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Master Examination Practice Drill #6 2011

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  1. Master Examination Practice Drill #6 2011

  2. Where a hotel has a stationary electric sign installed inside a decorative fountain, the sign shall be at LEAST ______ inside the fountain, when measuring from the outside edges of the fountain. • 2 feet • 3 feet • 4 feet • 5 feet

  3. 1. D • 680.57(C)(1)

  4. In an aircraft hanger, the area that extends upward from the floor level ________ above the upper surface of aircraft wings, power plants and fuel tanks shall be classified as a Class I, Division 2 or Zone 2 location. • 5 feet • 6 feet • 8 feet • 10 feet

  5. 2. A • 513.3

  6. Conductors supplying outlets for arc and xenon motion picture projectors of the professional type shall be a MINIMUM size of __________. • 12 AWG • 10 AWG • 8 AWG • 6 AWG

  7. 3. C • 540.13

  8. Where rigid polyvinyl chloride (PVC) conduit is installed underground to supply a gasoline dispensing unit, threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC) shall be used for the LAST ______ of the underground run to where the conduit emerges. • 2 feet • 4 feet • 5 feet • 6 feet

  9. 4. A • 514.8, Ex. 2

  10. Where electrical metallic tubing (EMT) is installed under metal-corrugated sheet roofing decking, a clearance of at LEAST _____ must be maintained between the top of the tubing and the surface of the roof decking. • 1 in. • 1 ¼ in • 1 ½ in. • 2 in.

  11. 5. C • 300.4(E)

  12. After applying all demand factors, the ampacity of the service-entrance conductors are required to be NOT less than _____ where both the overcurrent device and its assembly are not listed for operation at 100 percent of their rating. • 125 percent of the loads on the branch circuits • The sum of the loads on the branch circuits • The sum of the noncontinuous loads plus 125 percent of the continuous loads • The sum of all branch-circuit overcurrent protection devices.

  13. 6. C • 230.42(A)(1)

  14. The demand factor of any electrical system is the ratio of the maximum demand for a system to: • The totally connected load of the system. • 125% of the total connected load of the system. • 125% of the total connected continuous load of the system. • 80% of the total connected noncontinuous load plus 125% of the total connected continuous-load of the system.

  15. 7. A • Article 100

  16. The accessible portion of abandoned supply circuits and interconnecting cables located in an information technology equipment room shall be removed, UNLESS _________. • Tagged and identified as abandoned • Identified as Type CMP • Contained in a raceway • Disconnected from their supply source

  17. 8. C • 645.5(G)

  18. A residential branch circuit is to supply two (2) wall-mounted ovens rated at 4 kW each and one (1) 6 kW counter-mounted cooktop. Where all the equipment is 240 volts, single-phase, the branch-circuit conductors supplying this kitchen equipment shall have an ampacity of at LEAST __________. • 22 amperes • 27 amperes • 33 amperes • 37 amperes

  19. 9. D • T220.55 Note 4 Treat as one unit • 6kw+4kw+4kw= 14kw • 14-12=2x5=10 • 8000 x 1.10= 8800 watts/ 240V= 36.7 A

  20. On ac circuits, an ac general-use snap switch may be used for controlling a stationary motor rated 2 hp or less, if 300 volts or less, NOT exceeding _________ of the ampere rating of the switch at its rated voltage. • 50 percent • 80 percent • 115 percent • 125 percent

  21. 10. B • 430.83(C)(2)

  22. What MINIMUM size THWN copper conductors are required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor? Given: The motor is on the end of a short conduit run that contains only three (3) conductors, at an ambient temperature of 50°C. Consider the motor termination to be rated for 75°C • 6 AWG • 3 AWG • 2 AWG • 1 AWG

  23. 11. D • T430.250 • 430.22 • T 310.15(B)(16) • 74.8 x 1.25= 93.5 A • 93.5 / .75 ( Temp Correction)= 124.6 A • Use the 75C col.

  24. Which of the following statements regarding busways is/are true? Busways shall not be installed _________. • Where subject to severe physical damage • Outdoors or in wet or damp locations unless identified for such use • In hoistways • All of the above are true.

  25. 12. D • 368.12(A), (B) and (D)

  26. Which of the following shall be installed on the critical branch of the emergency system in a health care facility? • Exit signs • Nurse call systems • Communication systems • Fire alarms

  27. 13. B • 517.33 (A)(5)

  28. The emergency controls for attended self-service gasoline stations and convenience stores with motor fuel dispensers must be located NOT more than ________ from the motor fuel dispensers. • 20 feet • 50 feet • 75 feet • 100 feet

  29. 14. D • 514.11(B)

  30. Which of the following listed wiring methods is not approved for use in assembly locations, UNLESS encased in concrete? • EMT • Schedule 80 PVC • Type MC cable • Type AC cable

  31. 15. B • 518.4(A)

  32. Where transformer vaults are not protected with an automatic fire-suppression system, they shall be constructed of materials that have a MINIMUM fire-resistance rating of __________. • 1 hour • 2 hours • 3 hours • 4 hours

  33. 16. C • 450.42

  34. What percent of electrical supplied spaces in a recreational vehicle park must have 30-ampere, 125-volt receptacle outlets provided? • 60 percent • 70 percent • 90 percent • 100 percent

  35. 17. B • 551.71

  36. What is the MINIMUM bend radius of trade size 4 in. rigid metal conduit (RMC) where the bend is not made with a one-shot or full-shoe bender? • 16 inches • 18 inches • 24 inches • 30 inches

  37. 18. C • Cpt. 9, Table 2

  38. Type AC cable shall NOT be used _______. • In lengths of more than 6 ft. • In cable trays • As concealed feeders • Where embedded in plaster in wet locations.

  39. 19. D • 320.12(5)

  40. Where portions of a cable, raceway or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem, the raceway or sleeve shall ________. • Be filled with an approved material • Have an explosionproof seal • Be provided with a drain • Be installed below the level of the terminations.

  41. 20. A • 300.7(A)

  42. What is the MINIMUM size 75°C copper service-entrance conductors require for a 200 ampere rated commercial service? • 4/0 THW • 2/0 THW • 3/0 THHN • 3/0 THW

  43. 21. D • T310.15(B)(16)

  44. Determine the MINIMUM size THWN copper feeder conductors required by the NEC® to supply the following 480-volt, continuous duty, 3-phase, induction type, Design B, motors. Motor terminations are assumed to be rated at 75 degrees C. • 1 – 40 hp • 1 – 50 hp • 1 – 60 hp • 2/0 AWG • 3/0 AWG • 4/0 AWG • 250 kcmil

  45. 22. C • 77 x 1.25= 96+65+52= 213 A • Use 75C column of T310.15(B)(16)

  46. Two (2) or more motors may be installed without individual overcurrent protection devices if rated less than 1 hp each, and the full-load current rating of each motor does NOT exceed __________, if they are on a 120-volt, 20 ampere branch circuit. • 2 amperes • 4 amperes • 5 amperes • 6 amperes

  47. 23. D • 430.53(A)(1)

  48. Where a listed packaged spa or hot tub is installed outdoors, the unit is permitted to be cord-and-plug connected, provided the cord is NOT longer than _______ and protected by a GFCI. • 6 feet • 10 feet • 15 feet • 20 feet

  49. 24. C • 680.42(A)(2)

  50. Given: A three-phase, 480-volt, 100 ampere noncontinuous load is located 390 feet from a panelboard. What MINIMUM size THWN aluminum feeder conductors are required to limit the voltage drop to 3 percent? (K= 21.2) • 2 AWG • 1 AWG • 1/0 AWG • 2/0 AWG

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