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IEC YEAR 1 FINAL EXAM 2024 | ALL EXAM
QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | VERIFIED
ANSWERS | LATEST VERSION
Refer to Figure 110.15 A copper circuit conductor has a resistance of. ohm /1000 feet. This circuit feeds a load that is drawing 42 amps. The wire length is 250 feet out to the load plus 250 feet back to the panel. Use Ohm's Law [ E = Ix R ] to find the volts dropped in the circuit conductors and then find how much voltage will be applied to the load. The voltage applied to the load is _____ a. 16 b. 192 c. 208 d. 200 e. 206 ------CORRECT ANSWER---------------b. 192 Refer to Figure 128.203. The voltage across Lamp 1 is______ Volts. a. 120 b. 0 c. 30 d. 60 e. 240 ------CORRECT ANSWER---------------a. 120 For the circuit shown in Figure 128.203 , the fixed resistance of Lamp 2 is _____ ohms a. 144 b. 96 c. 75 d. 384 e. 192 ------CORRECT ANSWER---------------b. 96
Seven 1/0 AWG THHN THWN copper current carrying conductors are installed in a conduit. How much current can each of these carry ( corrected ampacity ) where the conduit is installed in an area where the summertime temperature is 142 °F? a. 110. b. 11 9 c. 110. d. 55. e. 77.35 ------CORRECT ANSWER---------------e. 77. When they are installed in a conduit with other circuits , 12 AWG THHN / THWN circuit conductors can carry_____ amps. There are total of 10 current-carrying conducters in the conduit. The consuit is installed theough the bar joists above the ceiling where the temperature is 139 degrees Farenheit. a .7. b. 10. c. 20 d. 21. e. 8.875 ------CORRECT ANSWER---------------b. 10. Refer to Figure 121.218 The raceway is conduit is Schedule 40 PVC and contains a 120 - volt, 20amp GFCI-protected. The conduit buried beneath the driveway for a house. The driveway is 6" thick. Minimum distance for "Y" is____ in. a. 18 b. 24 c. 4 d. 12 e. 6 ------CORRECT ANSWER---------------d. 12
c. 33. d. 60. e. 66.2 ------CORRECT ANSWER---------------D For Scenario 125.103-480 ,____amps of current will flow through each branch circuit conductor. ------CORRECT ANSWER---------------d. 60. The greatest number of 120 - volt , 20 - amp circuits you are permitted to install in a house to serve bathrooms is The house has 3 bathrooms and the circuit ( s ) will supply only bathroom receptacles a. 0 b. 1 c. 2 d. 3 e. unlimited - -----CORRECT ANSWER---------------e. Unlimited The fewest number of 120- volt , 20- amp branch circuits permitted to be installed in a house is_____ when these circuits will supply power to the lighting fixtures ( luminaires ) in bathroom #1 plus the receptacles in all three bathrooms in a house. a. 0 b. 1 c. 2 d. 3 ------CORRECT ANSWER---------------c. 2 A bathroom vanity lighting fixture will draw_____amps when connected to a 120 - volt branch circuit. The fixture has twenty-four lamps installed. Each lamp has a rating of 60 watts at 120 volts. a. (.33) b. 10 c. 3 d. 12
e. (.42) ------CORRECT ANSWER---------------d. 12 A circuit has 4 identical loads connected in parallel. The circuit voltage is 120 volts and the total connected load draws 11.2 amperes of current. The resistance of each of the identical loads is_____ohms a. 6. b. 24. c. 42. d. 1. e. 4 5 ------CORRECT ANSWER---------------c. 42. Refer to Figure 115.104. Each of the Type NM cables contains a ground. What is the minimum depth 2 - gang masonry ( brick ) box that could be used here? You will install a second receptacle in this box. The second receptacle is NOT shown. The "pigtails" to both of the receptacles are # 12 wires. As you can see , the cable connectors are external ( outside the box ). a. 1 7/ b. 2 1/ c. 2 1/ d. 1 1/ e. 3 1/2 ------CORRECT ANSWER---------------e. 3 1/ See Figure 115.317. The total current drawn by the duct heater when connected to the 208-volt circuit is_____amps. a. 8. b. 15. c. 12. d. 16. e. 13.52 ------CORRECT ANSWER---------------c. 12.
What is the monthly energy cost to operate a 200 - watt high - pressure sodium lamp? Electricity costs $ 0.11 per kW - hr and the lamp be ON for 12 hours per day. There are 30 days in a billing month. a. $8. b. $7. c. $6. d. $ e. $15.94 ------CORRECT ANSWER---------------b. $7.
- Refer to Figure 128.202. volts are applied across the water heater element. a. 480 b. 0 c. 120 d. 240 ------CORRECT ANSWER---------------d. 240 Refer to Figure 128.202. The neutral conductor carries _____amps. a. 1. b. 2. c. 2. d. 4. e. 2.31 ------CORRECT ANSWER---------------b. 2. 220.52(B) ------CORRECT ANSWER---------------Nameplate or 1500VA is allocated for laundry circuit Overcurrent ------CORRECT ANSWER---------------Type of circuit condition Ex: overload, short, and ground fault
GEC (Grounding electrode conductor) ------CORRECT ANSWER--------------
- A conductor used to connect the system grounded conductor or the equipment to a grounding electrode to a point on the grounding electrode system A 100-gallon water heater is to be installed to supply hot water to the restrooms in an office building. Should it be considered a continuous load and be upsized accordingly? ------CORRECT ANSWER---------------Old tank style water heaters 120 gallons or less is considered the continuous duty and requires the conductors to be upsized by 125% 310.12(A) ------CORRECT ANSWER---------------Lists the size of residential service conductors 210.21(B)3 ------CORRECT ANSWER---------------Lists the receptacle sizes per branch circuit sizes. Example you can put a 15a or 20a receptacle on a 20 amp circuit. 210.8 ------CORRECT ANSWER---------------Covers when GFCI protection is required An unfinished basement must have how many outlets that are GFCI protected ------CORRECT ANSWER--------------- 1 Service conductors must maintain minimum clearance of___ from doors and windows ------CORRECT ANSWER---------------3 '
A heating element in a plate warmer in a restaurant is rated to deliver 4. KW at 240 volts. How many amps does that plate warmer draw at 240 Volts. ------CORRECT ANSWER---------------18. The electrical supply house has 7532 feet of 12-2/G and 3927 feet of 12- 3/G How many more feet of 12/2G are there than 12-3/G. ------CORRECT ANSWER--------------- 3605 A circuit is to be run to a parking lot light. The blueprints call for you to run 8 AWG wire that has diameter of .128 inches. However you ran #10 wire that has a diameter of .116 inches You have _____ total Circuit ------CORRECT ANSWER---------------Increased An electrical contractor purchased the following materials for a certain job: 2500 Feet of 12/2 Romex for $321.30; 6- Ceiling fans for 42.17 each; and 150 feet of? EMT conduit for $.17 per foot ------CORRECT ANSWER--------- ------$599. 212F=_____ C ------CORRECT ANSWER--------------- 100 [F-32]* [5/9} [C*(9/5)]+ 107.38 is a _____ gang box ------CORRECT ANSWER--------------- 3
an electrician was making 13.50 per hour and worked 40 hours a week. He had bought a new truck and needed to make more money but was turned down for a rasie. He got mad and quit and was out of work for two week. He is now working a new job that pays $14.25 per hour. Working 40 hours per week at the new job, how many week will he have to work to make up for the pay that he lost while out of work. ------CORRECT ANSWER---------- ----- 36 Refer to Figure 107.1316 An Electrician has to set four circular transformers on a concrete pad. Two of the transformers are 23 inches in diameter, one transformer is 28 inches in diameter and one transformer is 18 inches in diameter. The total area these transformers will cover is ___ square inches. ------CORRECT ANSWER---------------1, The Volume of the tank shown in Figure 107.1424 is ____ Cubic yards -----
- CORRECT ANSWER---------------1, What is resistance of an incandescent lamp if the manufacturer supplies the following information. 100 watts 277 volts R=V^2/P ------CORRECT ANSWER---------------767. what is the current drawn by the hair dryer if the nameplate supplies the following information and it is operated at 110 volts. 1750 watts 120 volts R=E^2/p= I=E/R ------CORRECT ANSWER---------------13. what is the power used by the hair dryer if the nameplate supplies the following information and it is operated at 110 volts
EMT shall be securely fastened in place at least every___. In addition, each EMT run between termination points shall be securely fastened within _____ of each outlet box, junction box, device box, cabinet, conduit body or other tubing termination. NEC 358.30 ------CORRECT ANSWER--------------- 10FT-3FT A single Pole, double-throw switch has ____ screw terminals for the connection of current carrying conductors ------CORRECT ANSWER--------- ------ 3 For the connections of current carrying circuit conducutors, a DPST switch has ______ screw terminals ------CORRECT ANSWER---------------four The operation diagram for a four-way switch is shown as ------CORRECT ANSWER---------------IV NEC 90.5(B). ------CORRECT ANSWER---------------If a code rule is mandatory it will say you shall do and shall not do, if permissive it will say shall be permitted or shall not be required NEC 314.27(A)(2) ------CORRECT ANSWER---------------states Luminaries weighing more then 50 Lbs SHALL be supported independently of the outlet box
Describe Voltage ------CORRECT ANSWER---------------EMF electromotive force, and also potential NEC 210.5 ------CORRECT ANSWER---------------Conductor color identification 250.119 ------CORRECT ANSWER---------------EGC must be green or bare with stripes 200.6 ------CORRECT ANSWER---------------Grounded conductor(usually neutral) must be white grey 210.5 ------CORRECT ANSWER---------------(1) or (2) Ungrounded (hot) must be any color other than white bare or green Hospital Grade outlet has ------CORRECT ANSWER---------------A green dot on it A isolated ground outlet has a ------CORRECT ANSWER--------------- Orange dot on it AFCI ------CORRECT ANSWER---------------Detects arcing conditions in the circuit and will open to protect it
