IEC YEAR 1 FINAL EXAM 2024-2025, Exams of Nursing

Download IEC YEAR 1 FINAL EXAM 2024-2025 and more Exams Nursing in PDF only on Docsity! 1 | P a g e IEC YEAR 1 FINAL EXAM 2024-2025 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|NEWEST|GUARANTEED PASS|LATEST UPDATE An equipment grounding conductor (EGC) is the conductor that is ___. a.installed with the branch-circuit conductors in a conduit or cable run b.installed between the neutral bar and the ground bar in the service panel c.connected between the hot and cold water pipes at a water heater d.connected to the neutral bar in the service panel, the ground rod, the incoming main water service pipe, and/or the steel building structure a. installed with the branch-circuit conductors in a conduit or cable run Generally, an overcurrent protective device is not permitted to be continuously loaded to more than ___ percent of its rating. a.50 b.125 c.100 d.80 d. 80 A disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 8-10 in the 277/480-volt, 3Ø, 4-wire panel. This is a Code violation. a.True b.False a. True 2 | P a g e 240.50(a)(2) Plug fuses can only be used on 120/240V or 120/208V panels or lower. A breaker panel is permitted to be located ___. I. in the bathroom in a house II. in an electrical room in a school III. in a bathroom in a restaurant 2 and 3 Only Article ___ of the NEC® covers the requirements for fuses, fuse holders, and fuse adapters. a.260 Part III b.270 Part IV c.240, Part V d.250 Part VI c. 240, Part V Which of the following types of current travel through a fuse? a.overload b.short-circuit c.normal d.ground-fault e.all of these e. all of these Which of the following are standard size circuit breakers? I. 125 II. 150 a.I only b.II only c.both I & II d.neither I nor II c. Both 1 and 2 Which of the following are standard size circuit breakers? I. 20 II. 25 III. 30 a.I & III only b.I, II & III 5 | P a g e When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___. a.220.54 b.220.12 c.220.55 d.220.42 e.220.56 a. 220.54 The minimum size service disconnect for a single-family dwelling with a computed load of 10 kVA is ___ amperes. a.60 b.30 c.100 d.50 c. 100 100A is the minimum size service disconnect required by the NEC For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors. a.6 b.3 c.2 d.4 e.none of these b. 3 NEC Table 310.16 Article ___ of the NEC® is the article that gives requirements for swimming pool installations. a.750 b.680 c.560 d.860 b. 680 6 | P a g e Generally, safety switches and wall switches must be located at least ___ from the inside edge of a swimming pool. a.5' b.3' c.8' d.20' e.10' a. 5' Section ___ in the NEC® covers bonding of swimming pools. a.680.22 b.680.26 c.640.24 d.650.23 b. 680.26 A 20-amp, 120-volt duplex convenience receptacle near a pool shall be located so that it is ___ feet or more from the inside edge of the pool. a.61/2 b.10 c.6 d.12 e.20 c. 6' Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. True or False True When swimming pool installations are made, Article ___ in the NEC® provides the requirements for these installations. a.240 b.680 c.424 d.430 e.250 b. 680 7 | P a g e For spas and hot tubs in other than single-family dwellings, a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) that provide power to the recirculation system and jet system shall be installed at a point readily accessible to the users and not less than ___ away, adjacent to, and within sight of the spa or hot tub. a.10 b.5 c.6 d.20 b. 5 A disconnecting means (or disconnect switch) for a swimming pool circulation pump must be installed ___. a.so that it is visible from the pump b.readily accessible c.at least 5 feet from the inside wall of the pool d.all of these d. all of these What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC® requires to be installed near a permanently installed pool? The pool is located in your neighbor's backyard. a.two (one at each end) b.one c.four (one on each side) d.none are required b. one When receptacles that provide power for water-pump motors or for other loads directly related to the circulation and sanitation system are located at least 6 feet and 10 feet from the inside walls of the pool, these receptacles are required to meet which of the following conditions?I. They consist of single receptacles.II. They employ a locking configuration.III. They are of the grounding type.IV. They have GFCI protection. a.I & IV only b.I & II only c.III & IV only d.IV only e.I, III & IV c. III & IV only 10 | P a g e How much current is flowing in the neutral conductor at in Figure 128.209? a.4 b.2 c.0 d.5 e.none of these b. 2 The neutral has been broken in the circuit shown in Figure 128.418. The current through Lamp F (IF) with the neutral opened is ___ amps. a.6 b.1 c.2 d.8 e.3 b. 1 Refer to the panel schedule shown in Figure 128.231. If the neutral is removed from the neutral bar, ___ volts will be applied to the TV. a.120 b.160 c.240 d.32 e.80 b. 160 11 | P a g e A copier is connected to circuit LA-1. A microwave is connected to circuit LA-3. These two circuits share a neutral. The copier should draw 13.2 amps at 120 volts. The microwave is rated to use 1,800 watts at 120 volts. Circuits LA-1 and LA-3 originate in a 120/240-volt, 1Ø, 3-wire panelboard. If the neutral is disconnected from the neutral bar while the equipment is operating, there will be ___ volts applied to the microwave. a.128 b.56 c.184 d.120 e.112 e. 112 Volts Refer to Figure 128.523. Each battery puts out 12 volts. The voltage applied to the load is ___ volts. a.48 b.0 c.24 d.36 e.12 c. 24 Volts Both the schematic (near right) and the pictorial drawing (far right) are shown. The fixed resistance of EACH of the four elements in the furnace is 40 ohms. Refer to Figure 129.104. If the leads of a voltmeter are placed at T3 and T4, the meter will indicate ___ volts. a.0 b.480 c.120 d.240 12 | P a g e e.none of these c. 120 Volts Both the schematic (near right) and the pictorial drawing (far right) are shown. The fixed resistance of EACH of the four elements in the furnace is 40 ohms. Refer to Figure 129.104. When connected to the circuit, the total current drawn by the furnace (all four heating elements together) is ___ amps. a.12 b.48 c.40 d.24 e.6 e. 6 Amps This piece of equipment contains 4 heating elements that are equally rated. Each has the same power and voltage rating. Refer to Figure 129.106. When the equipment is energized and the current flowing through the element connected at T3 & T4 is 10 amps, the current flowing through the branch circuit conductors between the circuit breaker and the equipment ___. a.is 20 amps b.is 2.5 amps c.is 5 amps d.is 10 amps e.can’t be determinedThis piece of equipment contains 4 heating elements that are equally rated. Each has the same power and voltage rating. 15 | P a g e The load of lesser resistance would overheat and probably be damaged. c. No effect until one load is turned off or opens. d. No effect. a. The load of higher resistance would overheat and probably be damaged. Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13 amps and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral? a.3 b.13 c.29 d.16 3 Amps The Code reference that specifies the type of disconnecting means (circuit breaker for example) that can be used on a multiwire branch circuit that feeds devices mounted on the same yoke [a stack switch or a duplex receptacle for example] is ___.Note: Select N/A (not applicable) if there is not an NEC® requirement. a.Article 100 b.240.15(B)(1) c.404.8(A) d.N/A b. 240.15(B)(1) Voltmeters are connected in ___ with the load when used to measure voltage across a load in a circuit. Parallel The neutral has been removed from the neutral bar in the circuit shown in Figure 128.407. Lamp 3 is connected in ___ with Lamps 1 and 2. Series (3 wire parallel circuits turn to series when the neutral is disconnected from the neutral bar) What is the minimum number of receptacles required in an unfinished basement? a.2 b.4 c.1 d.0 c. 1 16 | P a g e The overall diameter (including insulation) of a 250 kcmil THHN/THWN copper conductor is ___ inches? a..082 b..397 c..765 d..711 e..575 d. 711 NEC Chapter 9 Table 5 pg 701 What part of the NEC® is a reference for calculating conduit fill where all conductors are the same size? a.Article 100 b.Table 310.15(B)(16) c.Annex C d.Table 314.16(A) c. Annex C What is the minimum trade size Schedule 80 PVC required to contain four 8 AWG THHN/THWN copper conductors? a.1 b.3/4 c.11/4 d.11/2 e.none of these b. 3/4 NEC Annex C Eleven #12, five #10, and six #6 THHN/THWN conductors will be installed in a run of EMT. The smallest trade size EMT you can use is ___. a.11/2 b.21/2 c.11/4 d.2 e.1 c. 11/4 NEC Chapter 9 Tables 4 and 5 17 | P a g e A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated, as long as the length of the EMT does not exceed ___. a.12 inches b.18 inches c.24 inches c. 24 inches An extension ladder should extend ___ feet above the top of the building and be secured. a.four b.three c.two d.one b. three ___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. a.Service point b.Attachment c.Mast service d.Lateral a. Service point Which term best describes a service lateral? a.underground feed b.overhead drop c.service ground d.service entrance a. Underground feed How many kW does a 100-ampere residential service draw when fully loaded? a.10 kW b.240 kW c.100 kW d.24 kW d. 24kW 100A x 240V = 24,000 W OR 24kW 20 | P a g e 150 A 12/3 cable is installed from a 120/240-V, 1Ø panel and feeds a split-wired duplex receptacle. One "hot" is connected to a 20A breaker in panel space 1. The second "hot" is connected to a 20A breaker in space 3. A 16-amp load is connected to the upper receptacle and a 14-amp load is connected to the lower receptacle. Which of the following will happen if the neutral is removed from the receptacle? Because a higher voltage will be applied, 120-volt equipment could be destroyed. Refer to Figure 129.106. With the equipment energized and the power used by the element connected at T3 & T4 is 0.3kW, the power used by the equipment (all 4 elements) ___. is 1.2 kW A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated, as long as the length of the EMT does not exceed ___. 24 in. An extension ladder should extend ___ feet above the top of the building and be secured. 3ft. What is the monthly energy cost to operate a 250-watt high-pressure sodium lamp? Electricity costs $0.15 per kW-hr and the lamp will be ON for 8 hours per day. There are 30 days in a billing month. $9.00 ___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. Service Point If a 60-watt lamp operates for 21 hours, the utility will bill for ___ kWh. 1.260 To minimize conductor insulation damage and arcing damage to electrical equipment during a ground fault or a short circuit, ___ should be minimized. a. time duration of the fault Article ___ in the NEC ® covers grounding and bonding of electrical systems. 250 Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box. are not For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors. 21 | P a g e 3 Loads, such as heating and air conditioning, that do not operate at the same time are said to be noncoincident loads. While separate circuits must be designed to serve each load, when calculating service load only the ___ of two noncoincident loads needs to be included. larger Which of the following is a 3/0 AWG conductor? 000 When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___. 220.54 The Standard for Electrical Safety in the Workplace requires that all electrical equipment operating at over ___ volts to ground be de-energized and locked out before anyone is permitted to work on or near the equipment. 50 Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. true Article ___ of the NEC ® is the article that gives requirements for swimming pool installations. 680 What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC ® requires to be installed near a permanently installed pool? The pool is located in your neighbor's backyard. one While installing Cat 5 cable, pulling too hard can damage the ___. jacket, conductor, insulation When a portable generator provides power for frame-mounted receptacles only, the NEC ® ___ require the frame to be connected to a grounding electrode. does not Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power. mechanical interlock 22 | P a g e It is permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure. true when installing and audio/video/data cables, the cables run should ___ not be kinked, be secured with rounded or depth stop staples, be bounded loosely with other cables terminations of RG-6 cable are made using __ connectors (jacks) F (connector) only Home automation controllers that utilize radio frequency (RF) ___ can send signals through walls A disconnecting means (or means of disconnect) for a swimming pool circulation pump must be installed ___ at least 5' from the inside of the pool, readily accessible, so that it is visible from the pump When receptacles that provide power for water pump motors or other loads directly related to the circulation and sanitation system are located 6' and 10' from inside walls of the pool, these receptacles are required to meet which of the following conditions? They are of the grounding type, they have GFCI protection what is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC requires to be installed near a permanently installed pool locates in you neighbors backyard one a 20-amp, 120-volt duplex convenience receptacle near a pool shall be located so that it is ___ feet or more from the inside edge of the swimming pool 6' Generally, safety switches and wall switches must be located at least ___ from the inside edge of the swimming pool 5' When calculating residential service load, ___ is allowed for each branch circuit serving laundry receptacles 1,500 volt-amperes the minimum size service disconnect for a single-family dwelling with a computed load of kVA is ___ amperes 60 25 | P a g e none if the leads of a voltmeter are placed at T1 and T8 the meter will indicate 0 how much current is following in the neutral conductor at C inn the figure 2 the nuetral conductor carries ___ amps 2.13 circuits 7 and 9 share neutral. this is a multi-wire branch circuit. if ckt 7 is drawing 13 amps and ckt 9 will draw 16 amps, how much current is flowing in the neutral 3 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 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 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) d . 12 26 | P a g e 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 . 6.18 b . 24.73 c . 42.86 d . 1.48 e . 45 c . 42.86 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 7/8 b . 2 1/8 c . 2 1/2 d . 1 1/2 e . 3 1/2 e. 3 1/2 See Figure 115.317 . The total current drawn by the duct heater when connected to the 208-volt circuit is_____amps . a . 8.89 b . 15.42 c . 12.31 27 | P a g e d . 16.89 e . 13.52 c . 12.31 Refer to Figure 110.15 A copper circuit conductor has a resistance of .778 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 b . 192 Refer to Figure 128.203 . The voltage across Lamp 1 is______ Volts. a . 120 b. 0 c . 30 d . 60 e . 240 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 b . 96 30 | P a g e Refer to Figure 130.104 . In amps , how much current will flow in the circuit conductor , connected to terminal 9 on the 2-pole? a . 20.5 b . 81.8 c . 5.86 d . 40.9 e . 32.7 d . 40.9 Refer to Figure 130.104 . Circuit 14 will draw___amps a . 10.3 b . 78 c . 97.5 d . 84.44 e . 48.75 c . 97.5 Refer to Figure 129.105 . The voltage applied to element R₂ is____volts. a . 60 b . 120 c . 480 d . 240 e . none of these d . 240 Refer to Figure 119.105 . When correctly connected , the dimmer is connected in_____with the two luminaires a . Series 31 | P a g e Refer connected to Figure 119.105 Schematic Diagram_____( below ) shows the dimmer and the lamps correctly A 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 . $8.8 b . $7.92 c . $6.6 d . $660 e . $15.94 b . $7.92 25. Refer to Figure 128.202 . volts are applied across the water heater element . a . 480 b . 0 c . 120 d . 240 d . 240 Refer to Figure 128.202 . The neutral conductor carries _____amps. a . 1.07 b . 2.13 c . 2.5 d . 4.26 e . 2.31 32 | P a g e b . 2.31 220.52(B) Nameplate or 1500VA is allocated for laundry circuit Overcurrent Type of circuit condition Ex: overload, short, and ground fault GEC (Grounding electrode conductor) 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? 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) Lists the size of residential service conductors 210.21(B)3 Lists the receptacle sizes per branch circuit sizes. Example you can put a 15a or 20a receptacle on a 20 amp circuit. 210.8 Covers when GFCI protection is required An unfinished basement must have how many outlets that are GFCI protected 1 Service conductors must maintain minimum clearance of___ from doors and windows 3 ' Chapter 9, table 8 Where you can find circular mil area of conductors Dryer load calculation When performing a load calculation, you must allocate 5KW or the nameplate rating of clothes dryer whichever is higher Dwelling load calc 35 | P a g e The Standard for Electrical Safety in the Workplace requires that all electrical equipment operating at over ___ volts to ground be de-energized and locked out before anyone is permitted to work on or near the equipment. 50 Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. true Article ___ of the NEC ® is the article that gives requirements for swimming pool installations. 680 What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC ® requires to be installed near a permanently installed pool? The pool is located in your neighbor's backyard. one While installing Cat 5 cable, pulling too hard can damage the ___. jacket, conductor, insulation When a portable generator provides power for frame-mounted receptacles only, the NEC ® ___ require the frame to be connected to a grounding electrode. does not Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power. mechanical interlock It is permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure. true when installing and audio/video/data cables, the cables run should ___ not be kinked, be secured with rounded or depth stop staples, be bounded loosely with other cables terminations of RG-6 cable are made using __ connectors (jacks) F (connector) only Home automation controllers that utilize radio frequency (RF) ___ can send signals through walls A disconnecting means (or means of disconnect) for a swimming pool circulation pump must be installed ___ at least 5' from the inside of the pool, readily accessible, so that it is visible from the pump 36 | P a g e When receptacles that provide power for water pump motors or other loads directly related to the circulation and sanitation system are located 6' and 10' from inside walls of the pool, these receptacles are required to meet which of the following conditions? They are of the grounding type, they have GFCI protection what is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC requires to be installed near a permanently installed pool locates in you neighbors backyard one a 20-amp, 120-volt duplex convenience receptacle near a pool shall be located so that it is ___ feet or more from the inside edge of the swimming pool 6' Generally, safety switches and wall switches must be located at least ___ from the inside edge of the swimming pool 5' When calculating residential service load, ___ is allowed for each branch circuit serving laundry receptacles 1,500 volt-amperes the minimum size service disconnect for a single-family dwelling with a computed load of kVA is ___ amperes 60 For a 125-amp, 120/240-V, 3W residential service, ____ AWG copper THHN/THWN conductors are the smallest permitted for the underground conductors 2 for purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per sq. ft. of area 3 volt-amperes plug fuses can be used on which of the following voltage systems? 120/208-volt, 1-ph, 3-wire 120/208-volt, 3ø, 4-wire (anything under 150- volts) the NEC has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. these are specified at ___ none A breaker panel is permitted to be located ___ 37 | P a g e in an electrical room in a school in a bathroom in a restaurant the disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 8-10 in the 277/480-volt, 3ø, 4-wire panel. Is a code violation Yes Usually, load centers are not available with "bolt-on" circuit breakers true when determining the minimum size of a grounding electrode conductor, table __ is used 250.66 if connected to a metal water piping system, the grounding electrode conductor shall be connected at some point within the first ___ of where it enters the building 5' an equipment grounding conductor (EGC) is the conductor that is ___ installed with the branch circuit conductors in a conduit or cable run the grounding blade on an attachment plug is ___ than the current-carrying conductor blades. This is to ensure that the grounding connection is made before the current-carrying conductor connections and breaks its connection after the current-carrying conductor connections (first to make last to break) longer the initial cost of metal halide luminaires is ___ than that of quartz greater the conductors at point III in figure 130.101 are ___. the service point is located at the meter service-lateral conductors refer to figure 130.104. circuit 13 is connected to the ___ busbar AØ in amps how much current will flow in the circuit conductor connected to terminal 13 on the 1-pole breaker 52.7 how many kw does a 100-ampere residential service draw when fully loaded 24kw which term best describes a service lateral underground feed