(The actual state exam will be closer to 50 questions in 4 hours time) Master Electrician Practice Test

Transcription

1 (The actual state exam will be closer to 50 questions in 4 hours time) Master Electrician Practice Test 1. Accessible as applied to wiring methods means capable of being removed or exposed without damaging the building structure or finish. a)t b)f 2. A building is a structure that stands alone or is that which is cut off from adjoining structures by firewalls with all openings protected by approved fire doors. a)t b)f 3. An equipment bonding jumper is the connection between the grounded circuit conductor and the equipment grounding conductor at the service. a)t b)f 4. A weatherproof fixture is constructed or protected so that moisture will not enter the enclosure under specified test conditions. a)t b)f 5. Wet locations include those which are underground or in concrete slabs or masonry in direct contact with earth. a)t b)f 6. Termination provisions for equipment for circuits rated over 100 amperes, or marked for conductors larger than #1 AWG shall be used only for conductors whose insulation rating is degrees centigrade. a) 30 b) 86 c) 75 d) 60

2 7. The working space depth of equipment with exposed live parts on one side and grounded parts on the other side, energized at less than 150 volts shall be feet. a) 3 b) 3 1/2 c) 10 d) 4 8. The minimum headroom of working spaces about service equipment, switchboards, panel boards, or motor control centers shall be feet. a) 7 b) 6 1/2 c) 6 d) none of the above 9. If a high discharge lamp is operating between 277 volts and 600 volts for tunnel lighting it must be mounted no less than feet high. a) 12 b) 14 c) 18 d) When replacing an outlet in a location that has no ground conductor which of the following is acceptable?: a)replace with the same type of non-grounded receptacle b)tear out the wallboard and pull a ground c)replace with a GFCI labeled "No Ground" d) a or c e)none of the above 11. If an electrician installs an outlet behind a freezer in an unfinished basement, it must be of the GFCI type: a)t b)f 12. For household ranges and cooking appliances the branch circuit supplying an 8 3/4 KW range shall have a minimum rating of. a) 8 KW b) 20 Amp c) 10 KW d) 40 Amp

3 13. Where fixed multi-outlet assemblies used in other than dwellings and where appliances are unlikely to be used simultaneously each 5 feet shall be considered to be VA. a) 90 b) 120 c) 180 d) In Wisconsin as far as the maximum number of service disconnects there shall be no more than in any one location. a) 6 b) 1 c) 2 d) For a one-family dwelling the feeder disconnect shall have a rating not less than. a) 60 amps b) 100 amps c) 10,000 watts d) 90 VA 16. Conductors are considered outside a building when they are buried under not less than of concrete. a) 2 inches b) 4 inches c) 6 inches d) 8 inches 17. The vertical clearance from ground level over a residential driveway for overhead service conductors not subject to truck traffic and are less than 300 volts to ground shall be ft. a) 10 b) 12 c) 15 d) The minimum size conductor for an underground lateral is. a)#4 copper / #6 aluminum b) #2 copper / #8 aluminum c)#8 copper / #6 aluminum d) #10 copper / #12 aluminum

4 19. Which of the following is used in calculating the minimum sized rating of a service entrance conductor? a) 100% of actual load b) sum of non-continuous load c) sum of the non-continuous load plus 125% of the continuous load d) sum of the inductive load times 2 pi 20. In a multiple-family dwelling shall have access to the service disconnecting means. a) owner / manager b) Superintendent c) each occupant d) utility electrician 21. Unless otherwise specified the current protection for a #14 AWG copper conductor shall not exceed amps. a) 10 b ) 1 5 c) 20 d) Type fuses shall fit Edison-base fuse holders. a) A b) M c) X d) S 23. Which of the following may be used to connect bonding and grounding equipment? a) Exothermic welding b) Sheet metal screws c) Solder d) Listed pressure connectors e) a and c only f) a and d only

5 24. Alternating current circuits less than 50 volts shall be grounded when the transformer supply exceeds volts. a) 50 b) 120 c) 150 d) Where parallel service entrance conductors are used they may be no less than AWG. a) 10 b) 1 c) 2 d) 1 / The main boding jumper shall be sized not less than % of the area of the largest phase conductor exceeding 1100 kcmil copper or 1750 kcmil aluminum. a) 12 1/2 b) 1 5 c) 30 d) If the service entrance conductors are 3/0, what size copper grounding electrode conductor is required. a) 2 AWG b) 4 AWG c) 6 AWG d) 8 AWG 28. What is the minimum size equipment grounding conductor allowable for a 200 amp service? a) # 8 cu b) # 6 al c) #6 cu d) #4 al e) a and b f) c and d

6 29. The grounding conductor for secondary circuits of instrument transformers shall not be smaller than AWG copper or AWG aluminum. a) 10, 12 b) 12, 10 c) 12, 14 d) 14, Bored holes for conductors through joists and wood members shall be bored so the edge of the hole is not less than from the nearest edge of the wood member. a) 1" b) 1 1/4' c) 1' d) 1 1/4" 31. Underground conductors, directly buried, shall be protected by enclosures or raceways extending to a point above ground and at least below ground. a) 6, 12" b) 8, 18" c) 10, 24" d) 12, 36" 32. What is the burial depth for conductors in PVC under a residential driveway? a) 6" b ) 4 " c) 12" d) 18" 33. Supports for vertical conductor runs size 2/0 aluminum can be no less than apart? a) 100 ft b) 50 ft c) 180 ft d) 140 ft 34. Temporary electrical power and lighting installations shall be permitted for a period not exceeding days for Christmas decorative lighting and similar purposes. a) 30 b) 60 c) 75 d) 90

7 35. Paralleled conductors in each phase, neutral, or grounded circuit conductor shall: a) Be the same length b) Be made of the same material c) Be the same circular mil area d) Have the same insulation type e) Be terminated in same manner f) All the above g) a / c only 36. When a conductor has a "-2" such as RHW-2 it means that that the conductor shall be permitted to be used at what highest continuous operating temperature? a) 30 C b) 60 C c) 90 C d) 86 F 37. If there are eight current carrying conductors in the same raceway by what percentage must they be derated in ampacity? a) 90% b) 80% c) 70% d) 60% 38. What minimum size aluminum conductors may be used for a 120 / 240 volt, 3-wire, single phase dwelling for a 150 amp service? a) 2/0 b) 3/0 c) 2 d) What is the maximum allowable amperage for a #1 AWG Copper THHN conductor? a) 110 b) 130 c) 150 d) 115

8 40. What is the maximum allowable amperage for the #1 AWG Copper conductor in Question 39 if it is ran behind a boiler with an ambient temperature of 131 F? a) 45.1 amps b) amps c) amps d) 97.6 amps 41. Intermediate metal conduit shall be supported at intervals not exceeding? a) 10 ft b) 12" c) 36" d) 5 ft 42. Rigid Metal Conduit shall be fastened from each outlet box but that distance can be extended to where structural members do not readily permit fastening. a) 3ft--5 ft b) 4 ft--8 ft c) 5 ft--10 ft d) 6 ft--8 ft 43. The sum of the cross sectional area of all contained conductors at any cross section of wireway shall not exceed % of the cross sectional area of the wireway. a) 10 b) 30 c) 20 d) What is the maximum number of #12 AWG conductors allowed inside a 4 x 11/2 square box? a) 8 b) 9 c) 17 d) As pertaining to box fill calculations what is the volume of a #10 AWG conductor? a) 2.5 cu in b) 2.25 cu in c) 2.00 cu in d) 1.75 cu in

9 46. The distance between raceway entries in an angle pull box enclosing the same conductor shall not be less than times the trade diameter of the largest raceway. a)2 b)3 c)4 d)6 47. In straight pulls, the length of the box shall not be less than times the diameter of the largest raceway. a) 24 b) 6 c) 36 d) The allowable ampacity of a #16 AWG fixture wire is amps. a) 2 b) 4 c) 6 d) When installed in a storage closet in a dwelling a recessed fluorescent luminaire must be located inches away from shelved or hanging clothing. a) 10 b) 12 c) 4 d) Outlet boxes or fittings installed as required by the code shall be permitted to support fixtures weighing lbs or less. a) 25 b ) 3 5 c) 50 d) 6

10 51. The branch circuit rating for an appliance that is continuously loaded, other than a motor operated appliance, shall not be less than % of its nameplate rating if listed for continuous loading. a) 50 b) 100 c) 80 d) Ceiling suspended paddle fans exceeding lbs shall be supported independently of the outlet box. a) 35 b) 40 c) 45 d) Branch circuit sizing for fixed resistance heating elements shall not be less than % of the total load of the motors and heaters. a) 80 b) 100 c) 115 d) Resistance type heating elements in electric space heating equipment shall be protected at not more than amps. Equipment rated at more than amps shall have its heating elements subdivided and each load shall not exceed 48 amps. a) 10, 30 b) 20, 60 c) 15, 45 d) 60, What color would designate 208 VAC as pertaining to space heating cables? a)red b) orange c) blue d) brown

11 56. As far as adjustable speed drive systems are concerned the disconnecting means shall be permitted to be in the incoming line to the conversion equipment and at a rating of not less than % of the rated input current of the conversion unit. a) 115 b) 125 c) 80 d) A locked rotor indicating code letter for a motor rated between kilo-volt amps at locked rotor would be? a)a b)k c)n d)t 58. The minimum wire bending space at the terminals of enclosed motor controllers for a size 1/0 conductor is inches. a) 2 b) 4 c) 5 d) The Ultimate Trip Current of a thermally protected motor shall not exceed % of the full load current given in Tables to as 9 amperes. a) 125 b) 115 c) 140 d) What is the full load current of a 208 Volt 3-phase 10 HP motor? a) 32.2 a b) 30.8 a c) 28.0 a d) 55.0 a

12 61. What is the maximum rating of motor branch circuit short circuit and ground fault protection when using an inverse time breaker to protect a 2 HP single phase 120 volt motor? a) 150% FLC b) 250% FLC c) 300% FLC d) 800% FLC 62. Where a flexible supply cord is used to supply a room air conditioner the length of cord shall not exceed ft for 120 VAC and ft for a 240 VAC rating. a) 10, 6 b) 8, 6 c) 8, 5 d) 10, Transformer vaults shall be located where they can be ventilated to the outside air without using flues or ducts whenever such an arrangement is possible. a) T b) F 64. The ampacity of capacitor circuit conductors shall not be less than % of the rated current of the capacitor. a) 110% b) 125% c) 115% d) 135% 65. Dust-Ignitionproof protection technique shall be permitted for Class II, Division 1and 2 locations. a) T b) F 66. If you saw T3 on a piece of industrial machinery, in a hazardous area what surface temperature would be designated? a) 450 F b) 300 C c) 215 F d) 200 C

13 67. A Class I Division 2 location is where combustible is not normally present in sufficient quantities to produce explosion. a) gas b) dust c) fibers d) paper 68. An explosion proof seal must be placed in each conduit entry into explosion proof enclosure where either the enclosure contains the apparatus, where high temperatures are considered to be an ignition source, or the entry is 2 inches or larger and the enclosure contains splices, terminals, o r t a p s i n a l o c a t i o n. a) Class I Division 1 b) Class II division 1 c) Class I Division 2 d) Class II Division 2 e) a and b only f) c and d only 69. When sealing Class II Division 1 and 2 locations it is permissible to use which of the following: a) A permanent seal b) A horizontal raceway not less than 10 ft long c) A vertical raceway not less than 5 ft downward d) all the above e) a and c f) none of the above 70. A location 15 ft away from a gas dispensing pump would be considered a location. a) Class I Division 1 b) Class I Division 2 c) Class II Division 1 d) Class II division The demand factor for feeders and service conductors at a mobile home park would be % for a park containing up to 40 units? a) 100% b) 44% c) 28% d) 24%

14 72. Each patient bed in a critical care area of a hospital shall be provided with a minimum of receptacles? a) 2 b) 4 c) 6 d) The demand factor for site feeders and service entrance conductors for an RV Park would be for a park with 25 sites? a) 38% b) 42% c) 88% d) 100% 74. Branch circuits that supply both outline lighting and signs containing incandescent and fluorescent forms of illumination shall not be rated more than amps. a)20 b)30 c)40 d) In a hoist way for an elevator it is permissible to use liquid tight flexible conduit in lengths over 6 feet. a)t b)f 76. Non-metallic raceways supplying swimming pool equipment must be buried at a minimum of inches. a) 6 b) 8 c) 18 d) A circuit breaker is best considered as: a)overload device b) over current device c)a switch d) a fuse

15 78. Another name for an overload device would be: a) heater b) fuse c) thermal reset d) breaker 79. The conductors found between the service panel and a sub-panel would be referred to as. a) feeder b) branch circuit c) service conductor d) hidden wiring 80. An outlet to a water heater would be best described as. a)dedicated b) individual c)protected d) 2 - phase 81. Cord and plug connected loads shall not exceed % of the branch circuit rating. a) 100 b) 80 c) 125 d) Branch circuits supplying more than one load are rated at 20, 30, 40, 50, and amperes only. a) 100 b) 60 c) 25 d) What is the maximum cord and plug load to receptacle rating for a 20 amp receptacle? a) 24 b) 16 c) 12 d) 10

16 84. What is the minimum size conductor allowed for a 15 amp branch circuit in a dwelling? a) 18 AWG b) 14 AWG c) 16 AWG d) 12 AWG 85. The total rating of an A/C unit fastened in place shall not exceed % of its branch circuit rating if lighting is also supplied? a) 100 b) 80 c) 125 d) In a dwelling the circuit conductors for a 15 amp branch circuit must have a minimum ampacity of amperes? a) 15 b) 20 c) 12 d) What would be the derating factor for 16 current carrying conductors in a 50 foot section of IMC conduit? a) 80% b) 70% c) 50% d) 45% 88. A continuous load is a load that is expected to stay energized for or more? a) 3 hours b) 6 hours c) 8 hours d) forever 89. If a branch circuit is wired with #12 THW the maximum OCD permitted when supplying eight 2 amp luminaires wired in place is amps? a) 30 b) 20 c) 15 d) 25

17 90. Which of the following are not considered to be continuous general lighting loads according to the National Electrical Code? a)show window lighting b) dwellings c)motel room lighting d) bank lobby lighting e)a and d only f) b and c only 91. An 8000 sq. ft. Barber shop would require how many 20 amp lighting circuits? a) 6 b) 10 c) 13 d) The main purpose of Table is: {Table (B) } a)determine the maximum ampacity of a conductor b)adjust ampacity by ambient temperature c)prevent electrical fires started by insulation melt down d)determine the minimum allowable size conductor e)a and b f) c and d g) all the above 93. You must count the neutral in a balanced 3-phase Wye system when derating current carrying conductors in a single raceway. a)t b)f 94. A #12 TW copper conductor has an ampacity of 20 amps. In an ambient temperature of 110 F the adjusted ampacity would be? a) 14.2 A b) 16.4 A c) 17.4 A d) 18.2 A

18 95. THHN conductors have a 90 C rating but only for derating purposes. When using THHN for installations in circuits rated over 100A would come out of the column? a) 30 C b) 60 C c) 75 C d) 106 C 96. When connecting THHN conductors that have a 90 C insulation rating to unmarked equipment terminations you must use the column of table ? a) 30 C b) 60 C c) 90 C d) 86 F amp service disconnect conductors may be loaded to 's column? a) 30 C b) 60 C c) 75 C d) 90 C 98. What is the ampacity of a #10 TW conductor in a conduit with 6 other current carrying conductors in an ambient temperature of 30 C? a) 30a b) 21a c) 24a d) 15a 99. Thirteen #14 THHN conductors are routed through an 18 inch long conduit and must be derated by? a) 65% b) 80% c) 90% d) 0% 100. A 26 inch nipple contains seven #10 THW current-carrying conductors in an ambient temperature of 30 C. What is the adjusted ampacity percentage? a) not required b) 30% c) 70% d) 80%

19 Answers and Code sections for the Master Practice Exam 1.A, Art. 100 Definitions 2.A, Art. 100 Definitions 3.B, Art. 100 Definitions 4.B, Art. 100 Definitions 5.A, Art. 100 Definitions 6.C, ( C)(1)(b) 7.A, Table (A)(1) condition 1 8.B, (E) 9.C, 210.6(D)(1)b 10. D, 406.3(D)(3)a----b; NEC 11. A, 210.8(A)(5) 12. D, (A)(3) 13. C, (H)1 14. A, (A) 15. B, (C) 16. A, 230.6(1) 17. B, (B)(2) 18. C, Art. 230 Part-III 19. C, Art 230 Part IV 20. B,240.4(D) 21. B, 240.4(D)

20 22. D, F, C, (A)(1) 25. D, (A)(8)b; (A)(3)(b) 2011 NEC 26. A, (D) 27. B, Table F, Table B, B, 300.4(A)(1) 31. B, 300.5(D)(1) 32. D, Table C, Table (A) 34. D, 590.3(B) 35. F, 310.4(1)---(6); 310.4(H)(2) 2011 NEC 36. C Table footnote C Table (B)(2)a; (B)(2)(a) 38. A Table (B)(6); (B)(7) 2011 NEC 39. A, Table ( C)(1)b(2); (B) NEC 40. A, A, 342.(B)(1) 42. A (A) 43. C,

21 44. B, Table (A) 45. A, Table (B) 46. D, (A)(2) 47. D, (A)(1) 48. D, Table D, 410.8(D)(3); ( C) NEC 50. C, (B) 51. D, (A) 52. A ; (D) 53. D,424.3(B) 54. D, (B) 55. C, (2) 56. A, Fig 430-1; 430 Part IX; D, Table 430.7(B) 58. C Table (B) 59. D, (A)(2) 60. B, Table B, Table A A, D 460.8(A) 65. A, 500.7(B) 66. D, Table 500.8(B); Table 500.8( C) 2011 NEC

22 67. A, 500.5(B)(2); 500.5(C)(2) 2011 NEC 68. A, (A)(1) 69. D, B, Fig 514.3; Table 514(B)(1) 71. D, Table C, (B)(1): NEC; NEC 73. B, Table A, 600.5(B)(1) 75. B, (A)(1)d 76. C, Table B, General 78. A, General 79. A, General 80. B, Definition 81. B, (A)(1) 82. D, (B)(3) 83. B, Table (B)(2) 84. B, Table D, (A)(2) 86. A, Table C, Table (B)(2)(a); Table (B)(3)(a)

23 88. A, 100 Definitions 89. B, 240.4(D) 90. F, (J) 91. C, [8000 x 3VA = 24000VA/(20A x 120V x80%) = 12.5] 92. G, Art. 90 Purpose; Table ; Table (B) NEC 93. B; balanced Wye = 0 neutral current 94. A,Table (A) (.71 x 20A) = 14.2A 95. C Table ; ( C); Table 31-15(B) NEC 96. B assume 60 C for unmarked terminals 97. B, Table ; C Table (.70 x 30A ) = 21A; Table (B)(3)(a) 2011 NEC 99. D, Chapter 9; notes to tables (4)

24 100. C, See Ques. 98 asked in a different wa y