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Free Basic Electrical Engineering Practice Test

Take this Free Basic Electrical Engineering Practice Test to see how well you understand your Basic Electrical Engineering. In case you miss any questions, adequate explanations have been provided. We highly recommend you to take this test.

  1. 10 questions in all. There is no time constraint, so take your time. You need to score at least 80% to pass
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#1. Where insulated power and lighting conductors are installed in raceways, an ampacity adjustment must be applied where _____. I. there are more than three (3) current-current carrying conductors in the same raceway II. an ambient temperature other than 86°F is encountered


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Part III of Article 310- Conductors for General Wiring, covers the general installation requirements for conductors rated up to and including 2000 volts. Section 310.14(B) tells the reader the ampacity of each conductor within a raceway needs to be corrected for ambient temperatures other than 30°C (86°F). Using the values shown in Table 310.15(B)(1), multiply the ampacities of the conductors specified in the ampacity tables by the appropriate correction factor shown in Table 310.15(B)(1) to correct the ampacities of the conductors. Also, Section 310.14(C) tell us the ampacity of each conductor is to be adjusted as shown in Table 310.15(C)(1) where the number of current-carrying conductors within a raceway or cable exceeds three. Again, multiply the conductor ampacities as shown in the ampacity tables by the percentage values given in Table 310.15(C)(1).


Free Basic Electrical Engineering Practice Test

#2. According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in lengths exceeding _____.


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Part VI of Article 250 explains the wiring methods and installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors. 250.122(5)d. specifies where flexible metal conduit (FMC) is longer than 6 ft. it is not considered an effective ground-fault current path.


Free Basic Electrical Engineering Practice Test

#3. Where a single 125-volt, single-phase, 20-ampere receptacle outlet located in an attached garage of a dwelling unit is provided for a central vacuum assembly, the receptacle outlet is required to have _____.


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Article 210 provides the general requirements for branch circuits. Section 210.8(A)(2) requires all 125-volt through 250-volt, single-phase receptacles installed in residential garages to be provided with ground-fault protection for personnel. There are no exceptions to this rule, the receptacles must be provided with GFCI protection for the user of appliances or other equipment regardless of where the receptacle is located in the garage.


Free Basic Electrical Engineering Practice Test

#4. Where Type NM cable is used as the wiring method for "home runs" for power and lighting branch circuits in a dwelling, the minimum size copper required is _____.


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The uses and ampacity ratings of conductors for general wiring are found in Article 310. Section 310.3 specifies the minimum size of conductors for general wiring shall be 14 AWG copper or 12 AWG aluminum except as permitted elsewhere in the Code.


Free Basic Electrical Engineering Practice Test

#5. When single-phase, 125-volt, 15- or 20-ampere receptacles are housed in a device box located outdoors in a wet location, the receptacles shall have an enclosure that is listed as _____ whether or not the attachment plug cap is inserted.


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Article 406 covers the rating and installation of receptacles. Section 406.9(B)(1) addresses the installation of receptacles of 15- and 20-amperes placed in a wet location and specifies where the plug-and-cord connection to receptacles is in a wet location, the enclosure is required to be weatherproof regardless of whether or not the plug is inserted.


Free Basic Electrical Engineering Practice Test

#6. For one-family dwellings supplied by a single-phase, 120/240-volt system, and having a 200-ampere rated inverse time circuit breaker for the main disconnecting means, what minimum size THWN aluminum conductors are permitted for use as ungrounded service-entrance conductors? Given: No adjustment or correction factors are required.


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Section 310.12 of Article 310, Conductors for General Wiring, permits the values given in Table 310.12 for use when sizing service and feeder conductors under this condition. The table indicates size 4/0 AWG aluminum conductors are the smallest size permitted for a 200-ampere rated service if no adjustment or correction factors are applied. Note, the service-entrance conductors for dwellings, under this condition, is reduced in size in relation service-entrance conductors for commercial and industrial occupancies due to the dwelling unit’s diversified load.


Free Basic Electrical Engineering Practice Test

#7. If a 1¾ in. deep, single-gang, Type FS device box houses a duplex receptacle, how many insulated size 12 AWG conductors are permitted to be enclosed in the FS box?


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Article 314 governs the installation and use of all outlet and device boxes. Table 314.16(A) shows six (6) size 12 AWG conductors are permitted in the FS box however, Section 314.16(B)(4) tell us the number of conductors allowed in the box shall be reduced by two (2) due to the receptacle contained in the FS box. Therefore, the box is permitted to have only four (4) size 12 AWG conductors.


Free Basic Electrical Engineering Practice Test

#8. The required 15- or 20-ampere receptacle outlet for a peninsular countertop or work surface in the kitchen of a dwelling must be located not further than _____from the outer edge of the peninsular countertop.


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Part III of Article 210 provides the general requirements for the required 125-volt, single-phase 15- and 20-ampere receptacle outlets in a dwelling unit. Section 210.52(C)(2)(b) specifies at least one receptacle outlet shall be located within 2 feet of the outer end of a peninsular countertop or work surface. Additional required receptacle outlets are permitted to be located as determined by the installer, home owner, or builder. This rule eliminates the need for extension cords.


Free Basic Electrical Engineering Practice Test

#9. In compliance with the rules established by the NEC®, all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlet or devices in specific areas or rooms of a dwelling unit shall be provided with arc-fault circuit-interrupter protection. Where Type NM cable is used as the wiring method for "home runs" in the dwelling, the maximum length of the cable from the overcurrent device to the first outlet shall not exceed _____ for size 14 AWG NM cable and _____ for size 12 AWG NM cable.


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Section 210.12 of Article 210, Branch Circuits, explains the rules for AFCI protection of 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in a dwelling unit. 210.12(A)(4)b. calls for the conductors to have length restrictions to the first outlet from the overcurrent device, based on the size of the conductors; 50 feet for 14 AWG and 70 feet for 12 AWG conductors. This rule is in place to restrict voltage-drop and prevent nuisance tripping of the overcurrent protection device.


Free Basic Electrical Engineering Practice Test

#10. The Code mandates a clearly labeled emergency disconnect is to be provided at each service for one- and two-family dwelling units. The emergency disconnect is permitted to be installed _____.


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The rules for service equipment and service conductors and their installation requirements are found in Article 230. Section 230.85 tells the reader the required emergency disconnect provided for one- and two-family dwellings is to be installed in a readily accessible outdoor location. This mandate was established because of the need for first responders and utility personnel to have a way to safely remove power from the house in an emergency.


Free Basic Electrical Engineering Practice Test
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