Iec year 1 final exam
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 will be ON for 12 hours per day. There are 30 days in a billing month. Select one: a. $7.92 b. $8.80 c. $15.94 d. $6.60 e. $660
$7.92
From NEC® Table 8 in Ch 9, the overall diameter of a 1/0 bare stranded copper conductor is ___ inches. Select one: a. .1855 b. .074 c. .372 d. .486 e. .109
.372
Which of the following is a 3/0 AWG conductor? Select one: a. 0000 b. 000 c. 0 d. 00
000
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. Select one: a. 6 b. 1 c. 2 d. 8 e. 3
1
What is the minimum number of receptacles required in an unfinished basement? Select one: a. 2 b. 4 c. 1 d. 0
1
When calculating residential service load, ___ is allowed for each branch circuit serving laundry receptacles. Select one: a. 1,500 volt-amperes b. 2,000 volt-amperes c. 1,920 watts d. 1,440 watts
1,500 volt-amperes
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 ___. Select one: a. 11/2 b. 21/2 c. 1-1/4 d. 2 e. 1
1-1/4
If a 95-watt lamp operates for 11 hours, the utility will bill for ___ kWh. Select one: a. 8.636 b. 10.450 c. 11.579 d. 1.045 e. 1.158
1.045
The minimum size service disconnect for a single-family dwelling with a computed load of 10 kVA is ___ amperes. Select one: a. 60 b. 30 c. 100 d. 50
100
For a 125-Amp, 120/240-V, 3W residential service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors. Select one: a. 1 b. 4 c. 3 d. 2 e. none of these
2
When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___. Select one: a. 220.54 b. 220.12 c. 220.55 d. 220.42 e. 220.56
220.54
Refer to Figure 128.523. Each battery puts out 12 volts. The voltage applied to the load is ___ volts. Select one: a. 48 b. 0 c. 24 d. 36 e. 12
24
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 ___. Select one: a. 12 inches b. 18 inches c. 24 inches
24 inches
How many kW does a 100-ampere residential service draw when fully loaded? Select one: a. 10 kW b. 240 kW c. 100 kW d. 24 kW
24 kW
Refer to Figure 128.202. ___ volts are applied across the water heater element. Select one: a. 120 b. 240 c. 0 d. 480
240
Article ___ of the NEC® covers the requirements for fuses, fuseholders, and fuse adapters. Select one: a. 260 Part III b. 270 Part IV c. 240, Part V d. 250 Part VI
240, Part V
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. Select one: a. Article 100 b. 240.15(B)(1) c. 404.8(A) d. N/A
240.15(B)(1)
Article ___ in the NEC® covers grounding and bonding of electrical systems. Select one: a. 422 b. 424 c. 250 d. 240 e. 280
250
When determining the minimum size of a grounding electrode conductor, Table ___ is used. Select one: a. 250.122 b. 310.15(B)(16) c. 250.66 d. 314.16(A) e. none of these
250.66
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? Select one: a. 3 b. 13 c. 29 d. 16
3
For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors. Select one: a. 6 b. 3 c. 2 d. 4 e. none of these
3
For purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per square foot of area. Select one: a. 1,500 watts b. 2 volt-amperes c. 3 volt-amperes d. 1 volt-ampere
3 volt-amperes
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. Select one: a. 25 ft (7.5 m) b. 10 ft (3.0 m) c. 5 ft (1.52 m)
5 ft (1.52 m)
Generally, safety switches and wall switches must be located at least ___ from the inside edge of a swimming pool. Select one: a. 5' b. 3' c. 8' d. 20' e. 10'
5'
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. Select one: a. 80 b. 50 c. 250 d. 150
50
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. Select one: a. 61/2 b. 10 c. 6 d. 12 e. 20
6
Article ___ of the NEC® is the article that gives requirements for swimming pool installations. Select one: a. 750 b. 680 c. 560 d. 860
680
Generally, an overcurrent protective device is not permitted to be continuously loaded to more than ___ percent of its rating. Select one: a. 50 b. 125 c. 100 d. 80
80
A disconnecting means (or disconnect switch) for a swimming pool circulation pump must be installed ___. Select one: 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
All of these
When installing any audio/video/data cables, the cable runs should ___. Select one: a. be bundled loosely with other cables b. be secured with rounded or depth-stop staples c. not be kinked or knotted d. all of these
All of these
Which of the following types of current travel through a fuse? Select one: a. overload b. short-circuit c. normal d. ground-fault e. all of these
All of these
While installing Cat 5 cable, pulling too hard can damage the ___. Select one: a. jacket b. insulation c. conductor d. all of these
All of these
What part of the NEC® is a reference for calculating conduit fill where all conductors are the same size? Select one: a. Article 100 b. Table 310.15(B)(16) c. Annex C d. Table 314.16(A)
Annex C
Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box. Select one: a. are b. are not
Are not
The number of conductors permitted in 80 PVC is specified in Table ___. Select one: a. 310.15(B)(16) b. 310.13 c. 347.2 d. C.10, Annex C
C.10, Annex C
When a portable generator provides power for frame-mounted receptacles only, the NEC® ___ require the frame to be connected to a grounding electrode. Select one: a. does b. does not
Does not
Electrical equipment located 7 feet from the inside wall of a pool is required to be grounded. Select one: a. True b. False
False
Plug fuses can be used on which of the following voltage systems? I. 120/240-volt, 1-ph, 3-wire II. 120/208-volt, 3Ø, 4-wire III. 277/480-volt, 3Ø, 4-wire Select one: a. I & III only b. II & III only c. I only d. I & II only e. any of these
I & II only
Terminations of RG-6 cable are made using ___ connectors (or jacks). I. F II. RJ-45 III. RJ-11 Select one: a. I, II, or III b. I only c. II only d. III only e. II or III only f. none of these
I only
Which of the following are standard size circuit breakers? I. 20 II. 25 III. 30 Select one: a. I & III only b. I, II & III c. II & III only d. I & II only
I, II & III
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 Select one: a. III only b. II & III only c. I, II & III d. II only e. I & III only
II & III only
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. Select one: a. I & IV only b. I & II only c. III & IV only d. IV only e. I, III & IV
III & IV only
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. Select one: a. larger b. smaller
Larger
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 make-last break). Select one: a.more durable b.longer c.larger d.tarnish-resistant
Longer
Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power. Select one: a. capacitor bank b. mechanical interlock c. SPST switch d. twistlock
Mechanical interlock
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. Select one: a. two (one at each end) b. one c. four (one on each side) d. none are required
One
Voltmeters are connected in ___ with the load when used to measure voltage across a load in a circuit. Select one: a. parallel b. series
Parallel
___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. Select one: a. Service point b. Attachment c. Mast service d. Lateral
Service point
What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads? Select one: a. The load of higher resistance would overheat and probably be damaged. b. 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.
The load of higher resistance would overheat and probably be damaged.
It is permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure. Select one: a. True b. False
True
Usually, load centers are not available with "bolt-on" circuit breakers. Select one: a. True b. False
True
Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. Select one: a. True b. False
True
Which term best describes a service lateral? Select one: a. underground feed b. overhead drop c. service ground d. service entrance
Underground feed
When a ground fault occurs, the OCPD will trip very quickly if the fault current has an effective ground-fault current path (a low-resistance return path) to take by way of the equipment grounding conductor. The lower this resistance, the faster the OCPD opens. Which of these ground-fault current return paths has the least (or lowest) resistance where run between two metal boxes? The copper equipment grounding conductor is bonded (or connected) to each box. Select one: a. the 12 AWG copper equipment grounding conductor inside PVC b. a 3/4" EMT with a 12 AWG copper equipment grounding conductor c. both a & b have equal resistance
a 3/4" EMT with a 12 AWG copper equipment grounding conductor
Home automation controllers that utilize radio frequency (RF) ___. Select one: a. require the receiver to be in sight of the sender b. can send signals through walls
can send signals through walls
According to Article 250, a metal underground water pipe that is in direct contact with the earth for 10 ft. or more (including any metal well casing effectively bonded to the pipe) and electrically continuous (or made electrically continuous by bonding around insulating joints or insulating pipe) to the points of connection of the grounding electrode conductor and the bonding conductors would be a good ___. Select one: a. insulator b. service conductor c. grounding electrode d. neutral
grounding electrode
An equipment grounding conductor (EGC) is the conductor that is ___. Select one: 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
installed with the branch-circuit conductors in a conduit or cable run
To minimize conductor insulation damage and arcing damage to electrical equipment during a ground fault or a short circuit, ___ should be minimized. Select one: a. time duration of the fault b. ampere level of the fault current c. both a and b d. neither a nor b
time duration of the fault
