Chapter 116

7740

A golf cart has a bank of six 6-volt batteries to run its 36-volt motor. The motor develops 5.2 horsepower and draws 105 amps. Each battery in the bank is rated for 6 volts and 215 A-hrs. The total capacity of the bank is ___ VA-hrs.

3" × 2" × 2.5" device

A group of five single-gang boxes are to be ganged together and have the following installed in the assembly: threesingle-pole switches, two three-way switches, two-12 AWG hot conductors, seven-12 AWG neutral conductors, five-12 AWG switch legs, five-12 AWG grounds, and five internal cable clamps. What minimum size would each of the ganged boxes have to be?

3 1/2

A kitchen countertop receptacle box is to be installed. A 12-2 MC "home run" enters the box and exits to feed the next receptacle in the circuit. Where external connectors are used, what is the shallowest switch (device) box that can be used? Don't forget that MC contains a ground.

5

A single 3" × 2" × 21/4" (switch) device box can hold no more than ___ 14 AWG conductors.

480

Article ___ in the NEC® covers storage batteries. Note: Select N/A ( not applicable) if there is not an NEC article.

hydrogen

Car batteries produce ___ gas.

safe grounding

Ceiling-suspended (paddle) fans must be specially supported for all of the following reasons,except for ___.

III

Each of the loads should operate at 12 volts. Each of the batteries delivers 12 volts. Without damaging the batteries or the loads, which of the connection diagrams shown in Figure 116.316 will supply the correct voltage to the loads?

short

If a conductor is placed across the terminals of a battery, what kind of circuit is created?

All of these: dirty loose corroded

Many battery problems are caused by ___ terminal connections.

black

Negative battery terminals generally have a ___ color marking.

7.37

Refer to Figure 116.413. The current through Load 2 is ___ amps.

11.0769

Refer to Figure 116.418. The fixed resistance of Element 2 is ___ ohms.

4.250

Refer to Figure 116.418. The power delivered by Element 2 is ___ kW.

4.995

Refer to Figure 116.418. The power used by Element 1 is ___ kW.

9245

Refer to Figure 116.418. The total power delivered to the loads (both elements) is ___ watts.

2561

See Figure 115.317. The totalpower consumed by the duct heater when connected to the208-volt circuit is ___ watts.

33.8

See Figure 115.346. The total resistance of the sterilizer is ___ ohms.

200.7(C)(1)

The Code section that specifies that white conductors in a cable assembly must be re-identified where used to "feed" a switch is ___. Select N/A (not applicable) if there is not a Code reference for this.

black

The negative terminal on a battery is generally color coded ___.

the vehicle frame

The negative terminal on a battery is generally connected to ___.

red

The positive terminal on a battery is generally color-coded ___.

a fuse block and the vehicle's starter

The positive terminal on a battery is generally connected to ___.

600

The resistance of the lamp shown below is ___ ohms.

13.5

Three 12 AWG circuit conductors that enter through one conduit and exit another conduit can be spliced with wire nuts inside an "LB" if the "LB" is marked with a cubic inch capacity of at least ___ cubic inches.

11.5

Two 12 AWG circuit conductorsand a 10 AWG equipment grounding conductor that enter through one conduit and exit another conduit can be spliced with wire nuts inside an "LB" if the "LB" is marked with a cubic inch capacity of at least ___ cubic inches.

II only

When batteries are connected in series, the ___ supplied to the connected load increases. I. current II. voltage

I only

Which connection diagram in Figure 116.303 is correct where the batteries are rated at 6 volts?

16

With the switch ON, the meter shown in Figure 116.318 should read ___ volts.

parallel

You have a load that operates at 6 volts but requires more current to operate than a single battery could deliver. To supply enough current to operate the load, you should connect multiple 6-volt batteries in ___.

7

A single 4" × 21/8" × 21/8" (handy) device box can hold no more than ___ 14 AWG conductors.

not specified in the NEC®

Along a wall line (not separated by doors), the maximum spacing between receptacles in the dining room in a cafeteria is ___.

arc-fault circuit interrupter (AFCI)

The NEC® at Section 210.12 requires that ___ protection be provided for all electrical outlets in residential bedrooms.

1.5

Type D, C, AA, and AAA batteries are ___-volt batteries.

4.44

The lamp is rated to deliver 20 watts when operated at this applied voltage. The current that will be indicated on the meter is ___ amps.

series

Two 12-volt batteries would be connected in ___ to deliver the correct voltage to a 24-volt load.

6

Typical 12-volt automobile batteries contain ___ cells.

210.52(A)(2)(2)

When determining the spacing between wall receptacles, the Code section that specifies whether or not the slidingpanels in glass doors in a dwelling are counted in the maximum spacing is ___. Select N/A (not applicable) if there is not a Code reference for this.

distilled water

When filling a wet-type battery, such as a vehicle battery, you should fill it with ___.

a grounded surface in the vehicle with the "dead" battery

When giving someone's vehicle a "jump start" using jumper cables, the last connection made is to ___.

75.5

116.04.092_link A piece of equipment has a nameplate rating of 22.7 KW at 250 volts. How much current will the equipment draw when connected to a 208-volt circuit?

"Weatherproof" and "GFCI protected" only

A 125-volt, 15- or 20-ampere receptacle installed outside a house is required to be ___.

Neither "an exhaust fan" or "a low-voltage lighting transformer"

A standard incandescent dimmer can be used to control which of the following loads?

Either "lead-acid" or nickel-cadmium"

A storage battery is comprised of one or more rechargeable cells of the ___ or other rechargeable electrochemical types.

12

Along a wall line (not separated by doors), the maximum spacing between receptacles in the dining room in a house is ___ feet.

196

Refer to Figure 110.14. Using Ohm's law (Table 8, Chapter 9), the voltage applied to the load is ___. The circuit conductors are #6 un coated THHN/THWN stranded copper. The circuit current is 14.4 amps. The load is located 898 feet away from the breaker panel where the voltage is 209 volts line-to-line.

192

Refer to Figure 110.15. A copper circuit conductor has a resistance of .778 ohms/1000 feet. This circuit feeds a load that is drawing 42 amps. The wirelength is 250 feet out to the load plus 250 feet back to the panel. Use Ohm's Law [E = I × R] to find the volts dropped in the circuit conductors and then find how much voltage will be applied to the load. The voltageapplied to the load is ___.

3686

Refer to Figure 115.343. What is the total power consumed by the duct heater when connected to the 480-volt circuit?

the exterior light fixture

Refer to Figure 116.109. The single-pole switch to the left of the sliding doors controls ___.

5.56

Refer to Figure 116.318. There will be ___ amps of current flowing through the switch. Each lamp has a rated operating voltage of 12 volts.

70

The NEC® at 314.27(C) states that listed outlet boxes or outlet box systems that are listed and marked for the purpose shall be permitted to support ceiling-suspended fans (paddle type) that weigh ___ pounds or less.

21/8"-deep 4" round box

The ceiling box shown in Figure 121.320 is part of a wiring layout drawing for a room. The wiring method will be 12 AWG wire with an EGC installed in EMT. Which of the following boxes is the smallest that can be used for the outlet box? A luminaire will be installed on the box.

13

The maximum number of 12 AWG conductors that are permitted to be installed in a 411/16 × 11/2 square box is ___.

36

The meter shown in Figure 116.332 should read ___ volts with the switch ON.

3 1/2

The switch box shown in Figure 116.203 will contain a duplex receptacle. One "hot," one neutral, and one EGC enter the box through each of the conduits. These are spliced in the box with wire nuts and "pigtails" are connected to the receptacle. All wires are 12 AWG copper THHN/THWN. The shallowest switch box permitted for this installation is ___ inches deep.

9

The transistor-type batteries used in smoke detectors have a voltage rating of ___.

4.5

The voltage is applied to the flashlight lamp when the 1.5-volt batteries are inserted in the flashlight, as shown at the right, is ___ volts.

1.5

The voltage that is applied to the flashlight lamp when the 1.5-volt batteries are inserted in the flashlight, as shown at the right, is ___ volts.

Both "voltage" and "Amp-Hr"

When connecting batteries as a bank, each battery should have the same ___ rating.

Both I and II

Which connection diagram in Figure 116.310 shows all the equipment correctly connected? The downrigger and the pump are both rated for 12-volt DC operation. The troll motor is rated for 24-volt DC operation.

411/16 × 21/8 square

According to the NEC®, what is the smallest size box permitted to hold three 12 AWG, six 8 AWG, and four 10 AWG conductors?

a baking soda and water mix

Battery terminals should be cleaned with ___.

14

Each battery can deliver 7 amps per hour. Two 12-volt batteries that are connected in parallel can deliver ___ amps per hour.

210.8(A)(3)

Refer to Figure 116.109. Theplans require that the outside receptacle for this dwelling be GFCI protected. The Code reference(s) for this requirement is ___. Select N/A (not applicable) if there is not a Code reference for this.

2 3/4

Refer to Figure 116.201, shown above. The wiring method used is 12 AWG MC cable (with external connectors). Two 3" × 2" metal switch boxes will be ganged together to form a 2-gang switch box for the switches. The minimum depth of EACH box is ___ inch. Remember: MC cable contains a grounding conductor!

600

Refer to Figure 116.301. The resistance of the lamp is ___ ohms.

24

Refer to Figure 116.310. ___ volts is being supplied to the trolling motor in Diagram II.

none of these: 240 2880 576 1152

Refer to Figure 116.313. The resistance of the lamp is 100 ohms. The power used by the lamp is ___ mW.

28.22

Refer to Figure 116.413. The total "hot" resistance of the connected load (both elements) is ___ ohms.

7.37

Refer to Figure 116.413. The total current supplied by the circuit (flowing in each wire in the J-Box) is ___ amps.

104

Refer to Figure 116.413. The voltage applied to Load 1 is ___ volts.

.505

Refer to Figure 116.416. The current flowing through Lamp 1 is ___ amps.

52.4

Refer to Figure 116.416. The power delivered to Lamp 3 is ___ watts.

.505

Refer to Figure 116.416. The total current flowing through the power supply to the lamp loads is ___ amps.

132.2

Refer to Figure 116.416. The voltage applied to Lamp 1 is ___ volts.

2.0

Refer to the legend and partial wiring plan in Figure 116.201. The wiring method used is 10 AWG wire installed in EMT. A separate equipment grounding conductor is not required for this installation. A 4 11/16 × 11/4inch square metal box with a 2-gang plaster ring is to be installed as the box assembly. The minimum cubic inch capacity of the plaster ring that will be installed on the box is ___ inch.

6.75

Refer to the legend and partial wiring plan in Figure 116.201. The wiring method used is 12 AWG wire installed in EMT. A separate equipment grounding conductor is not required for this installation. A 4 × 11/4 inch square metal box with a 2-gang plaster ring is to be installed as the box assembly. The minimum cubic inch capacity of the plaster ring that will be installed on the box is ___ inch.

240

See Figure 116.425. E 2 = Voltage dropped across Element 2 = ___ volts.

34.25

See Figure 116.425. I 2 = Current through Element 2 = ___ amps.

7.0064

See Figure 116.425. R 2 = Fixed resistance of Element 2 = ___ ohms.

series

See Figure 116.425. These elements are ___ connected.

distilled water

Serviceable battery fluid levels should be maintained by filling with ___.

none of these

Which of the boxes or box assemblies is permitted to contain a 50-amp, 120/240-volt, 1Ø, 4-wire receptacle and its 6 AWG copper THHN/THWN circuit wiring and ground wire? A single "drop" of EMT has been connected to the box. The EGC is installed in the EMT. This is the only outlet connected to the circuit. I. 3" × 2" × 31/2" device (switch) box II. 4" × 21/8" square box with a 3.2 cu. in. 1-gang plaster ring III. 4" × 21/8" square box with a 5.1 cu. in. 2-gang plaster ring

Section 314.24

Although a box has been selected to meet the minimum volume requirements of the NEC®, the box may be too small to accommodate the device installation without damage to the wiring. ___ in the NEC®addresses this potential problem.

16

Refer to Figure 110.15. A copper circuit conductor has a resistance of .778 ohms/1000 feet. This circuit feeds a load that is drawing 42 amps. The wirelength is 250 feet out to the load plus 250 feet back to the panel. Use Ohm's Law [E = I × R] to find the volts dropped in the circuit conductors. The voltage dropped in the circuit conductors (out & back) is ___.

3 1/2

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 secondreceptacle in this box. Thesecond 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).