Electrical Engineering > QUESTIONS & ANSWERS > Journeyman Electrician Exam Questions and Answers Graded A+ (All)
Journeyman Electrician Exam Questions and Answers Graded A+
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Journeyman Electrician Exam Questions and Answers Graded A+ Where K=12.9, what is the approximate voltage-drop on a circuit where an 80-ampere, 240-volt, single-phase load is supplied with size 3 A... WG copper conductors with THWN insulation, and placed 200 feet from a panelboard? *Chapter 9 tables, table 8 conductor properties (pg. 70-689) ✔Ans✔ 7.84 volts voltage-drop formula VD=2KID VD=2 x 12.9 x 80amps x 200ft. =7.84 CM 52.620 CM Given the following information, what is the maximum approximate distance a single-phase, 240-volt, 42-ampere load can be located from a panelboard? *copper conductors - K = 12.9 *size 8 AWG THWN/THHN conductors are used *limit voltage drop to 3% *Chapter 9 tables, table 8 conductor properties (pg. 70-689) ✔Ans✔ 50 feet Distance formula 1st. find allowable VD - 240volts x 3% = 7.2volts D=CM x VD D=16,510 x 7.2=118,872=109.7feet 2 x K X I 2 X 12.9 X 42 What is the minimum allowable trade size intermediate metal conduit (IMC) required to contain a total of ten (10) copper THW conductors in a 20ft run, five (5) size 1 AWG and five (5) size 3 AWG? *(Pg. 70-684) ✔Ans✔ 2-1/2 Inches size 1 AWG THW=.1901 sq. in. x 5=.9505 sq. in. size 3 AWG THW=.1134 SQ. IN. x 5=.537 sq. in. total=1.5175 sq. in. *NOTE: A trade size 2-1/2 in. IMC with an allowable 40% fill of 2.054 sq. in. should be selected. If more than 2 conductors are used in a tube of EMT conduit, the total interior area that can be filled is no more than ______ percent. *(Pg. 70-680) ✔Ans✔ 40% What is the maximum cross-sectional value that conduit nipples under 24 inches long may be filled? *(pg. 70-678) ✔Ans✔ 60% (4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60% of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition True or False: The raceway fill limitations detailed in 300.17 will apply to coaxial cables. ✔Ans✔ False [Show More]
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