ELECTRICIANS PRACTICE EXAM questions well solved 100% correct

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1. Disregarding exceptions, dry-type transformers located indoors having a rating of greater than _____ shall be installed in a transformer room of fire-resistant construction. A. 75 KVA B. 87 1/2 ... KVA C. 112 1/2 KVA D. 50 KVA C- 112 1/2 KVA 450.21(B) pg 335 2. What is the MINIMUM height allowed for a fence enclosing an outdoor installation of 2,400 volt electrical equipment? A. 6 feet B. 7 feet C. 8 feet D. 9 feet B - 60 7 feet 110.31 pg 49 3. Where power for equipment is directly associated with the radio frequency distribution system is carried by the coaxial cable, and the power source is a power limiting transformer, what is the MAXIMUM voltage this coaxial cable may carry? A. 50 volts B. 60 volts C. 120 volts D. 150 volts B - 60 volts 820.15 pg 656 4. Where a 15-ampere rated general-use ac snap switch is used as a disconnecting means for an ac motor, the NEC requires the MAXIMUM full-load current rating of the motor to be NO more than _________. A. 7.5 amperes B. 10 amperes C. 12 amperes D. 15 amperes C - 12 amperes 430.109(C)(2) pg 315 15 amperes x 80% = 12 amperes 5. Determine the MAXIMUM number of 125-volts, general-purpose receptacle the NEC permits to be protected by a 20-ampere 120-volt, single-pole inverse time circuit breaker in a commercial occupancy. A. 18 B. 15 C. 13 D. 10 C - 13 220.14(I) pg 71 120 volts x 20 amps = 2,400 VA (circuit) 2,400 VA (circuit) / 180 VA (one receptacle) = 13 outlets 6. Which of the following statement, if any, is/are true regarding illumination for service equipment installed in electrical equipment room? I. The illumination shall not be controlled by means of three way switches. II. The illumination shall not be controlled by automatic means only. A. I only B. II only C. both I and II D. neither I nor II B - II only 110.26(D) pg 48 7. In regard to the tenant spaces in a retail shopping mall; each occupant shall have access to the main disconnecting means, EXCEPT: A. where the service and maintenance are provided by the building management. B. where there are more than six disconnecting means provided. C. where the primary feeder transformer does not exceed 600 volts. D. where the secondary of the service transformer does not exceed 240-volts to ground.. A - where the service and maintenance are provided by the building management. 240.24(B)(1) pg 98 8. Determine the conductor allowable ampacity given the following conditions: * ambient temperature of 44 deg. C * 250 kcmil THWN copper conductors * four (4) current-carrying conductors are in the raceway * length of raceway is 25 feet A. 160 amperes B. 167 amperes C. 200 amperes D. 209 amperes B - 167 amperes Table 310.15(B)(16) pg 150 Table 310.15(B)(2)(a) pg 147 Table 310.15(B)(3)(a) pg 148 Size 250 kcmil THWN copper ampacity before derating = 255 amperes 255 amps x .82 (temp. correction) x .8 (adjustment factor) + 167.28 amperes 9. Determine the MAXIMUM overcurrent protection permitted for size 14 THWN copper motor control circuit conductors tapped from the load side of a motor overcurrent protection device. Given: the conductors require short-circuit protection and do not extend beyond the motor control equipment enclosure. A. 20 amperes B. 25 amperes C. 30 amperes D. 100 amperes D - 100 amperes Table 430.72(B) pg 311 10. Circuit breakers rated _________ or less and 1000 volts or less shall have the ampere rating molded, stamped, etched or similarly marked into their handles or escutcheon areas. A. 600 amperes B. 200 amperes C. 400 amperes D. 100 amperes D - 100 ampers 240.83(B) pg 100 11. In the kitchen of a dwelling unit where a single-phase, 125-volt, 15-or 20-ampere rated receptacle outlet is installed for a refrigerator and is located within 6 feet of the top of the kitchen sink, the receptacle outlet shall be provided with ____________. A. GFCI protection only B. AFCI protection only C. both GFCI and AFCI protection D. neither GFCI nor AFCI protection C - both GFCI and AFCI protection 210.8(A)(7) pg 59 210.12(A) pg 60 12. A distance of NOT less than _____ in any direction shall be maintained between portable carnival or circus structures and overhead conductors operating at 600 volts or less, except for the conductors supplying the protable structure. A. 20 feet B. 10 feet C. 12 1/2 feet D. 15 feet D 15 feet 525.5(B)(1) pg 445 [Show More]

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