Electrical Engineering Quiz

Required
1. Figure A-1 is a one-line diagram representing a service entrance. The black box with the letter

C in the center of it represents panel C. How is it possible for you to determine from this diagram if panel C is a single-phase panel or a three-phase panel?

A. Because the conductors feeding panel

C are installed in 2 ½-inch conduit.

B. The letter

C is a standard code that identifies it as single-phase.

C. The four #3/0 conductors feeding it most probably identify it as three-phase, but looking at a

three-line diagram of the same system would tell me for sure if it’s single-phase or three-phase.

D. All time clocks are single-phase, so it must be single-phase since it has a time clock connected to

it.

2. Using the one-line diagram in Figure A-1, how many #12 wires would you install for the roof-top

receptacle circuit, and how did you determine this quantity? A. I would install three #12 conductors to it because the line representing the circuit has three slash marks (///) on it.

B. I would install three #12 conductors to it because the receptacle is rated at 120 volts.

C. I would install four #12 conductors to it because all roof-top receptacles have four #12 wires con-

nected to them.

D. I can’t determine how many #12 conductors to install to the rooftop receptacle circuit by looking at

this one-line diagram.

3. The one-line diagram in Figure A-1 shows that beside the conduit to panel

C, the electrician must also install an empty 2 ½-inch conduit to the meter socket. Based on what you’ve learned about service entrance equipment, what will this conduit be used for?

A. Another panel that will be connected at a later time

B. Ancillary equipment conductors such as telephone and cable television

C. The service conductors from the utility company

D. A structural support for the meter socket

4. An electrician is given the panel schedule shown in Figure A-2. The electrician must collect all the

breakers needed for the listed branch circuits. A main breaker isn’t required at this time. By examining

the panel schedule, determine the pole and amperage combination for each of the breakers and

chose the correct list of breakers from the choices listed below.

A. 24 single-pole 20 amp, 21 single-pole 70 amp, 3 single-pole 225 amp breakers

B. 24 single-pole 20 amp, 7 three-pole 70 amp, 1 three-pole 225 amp breakers

C. 24 single-pole 20 amp, 12 single-pole 70 amp, 3 three-pole 70 amp, 1 three-pole 225 amp breakers

D. 8 three-pole 20 amp, 7 three-pole 70 amp, 1 three-pole 225 amp breakers

5. An electrician is told to measure the distance from the panel whose schedule is shown in Figure A-2

to each of the RTUs listed on the schedule. The electrician must also measure the distance from the

panel to the transformer that will supply Panel 4P. He or she must then measure, cut, and string out

these wire runs to prepare for pulling the branch circuit conductors into conduit. The electrician must

also obtain full reels of all the other conductors needed according to the panel schedule. Which of the

following lists the tasks that the electrician must follow?

A. Measure, cut, and string out #10, #8, and #4 conductors; get a full reel of #4/0

B. Measure, cut, and string out #10, and # 8 conductors; get a full reel of #4 and #4/0

C. Measure, cut, and string out #4/0, and #8 conductors; get a full reel of #10 and #4

D. Measure, cut, and string out #4/0, and #4 conductors; get a full reel of #10 and #8

6. The journeyman on a commercial wiring job gave you the wiring diagram shown in Figure A-3 and

told you to install the receptacle boxes. The diagram doesn’t indicate exactly where to put the boxes

except that all receptacles will be mounted 12 inches from the bottom of the box to the floor. How will

you decide where to locate receptacles?

A. I’ll determine the location of the receptacles by consulting the NEC. I’ll install the receptacles

12 inches from the bottom of the box to the floor.

B. As long as I install receptacles on the wall partition shown, exact location isn’t important.

C. Making sure I install the receptacles 12 inches from the bottom of the box to the floor, I’ll install a

receptacle box every 6 feet to make sure there are enough receptacles in the building.

D. Since this building is commercial, not residential, I’ll determine the location of receptacles by

measuring directly on the drawing using the scale inch on the drawing is equal to one foot on

the actual building. I’ll install the receptacles 12 inches from the bottom of the box to the floor.

7. The drawing in Figure A-4 represents a floor plan for a single room. Based on what you’ve learned about wiring electrical circuits, which of the following statements best describes the wiring in the drawing?

A. The system includes one 120-volt circuit, two 3-way switches, two single-pole switches, one fan

switch, three non-split duplex receptacles, one split duplex receptacle, and two GFCI weatherproof outside duplex receptacles.

B. The system includes one 220-volt circuit, two 3-way switches, two single-pole switches, one fan

switch, four split duplex receptacles, and two GFCI weatherproof outside duplex receptacles.

C. The system includes two 120-volt circuits,  two 3-way switches, two single-pole switches, one fan

switch, four non-split duplex receptacles, and two GFCI weatherproof outside duplex receptacles.

D. The system includes one 120-volt circuit, two 3-way switches, two single-pole switches, four split

duplex receptacles, and two GFCI weatherproof outside duplex receptacles.

8. After considering the locations of receptacles in the electrical system shown in Figure A-4, which of the following characteristics of the system design

does not correspond to presently acceptable practices?

A. There’s only one split duplex receptacle in the room and there should be two.

B. There are no receptacles on the west wall and not enough on the east wall.

C. The distance between the receptacles isn’t exactly even.

D. The split duplex receptacle can’t be on the same circuit as the other duplex receptacles.

9. The room shown in Figure A-4 was remodeled into a small efficiency apartment by adding a small

kitchen and a bathroom as shown in Figure A-5. The kitchen has a sink and a 220-volt electric range.

The bathroom has a basin, commode, and a tub. A 220-volt circuit was installed directly from the range

receptacle to the electrical panel serving the room. An electric water heater was installed but hasn’t yet

been hooked up. According to the circuit lines shown in Figure A-5, which of the following statements

describes one thing (there may be others) that’s wrong with the installation of the newly added circuitry?

A. The kitchen receptacles and the kitchen lights can’t be on the same circuit.

B. The bathroom receptacle and the bathroom light can’t be on the same circuit.

C. There should be a receptacle on each side of the basin in the bathroom.

D. There should be two small appliance circuits in the kitchen.

10. You’ve been given the job to supply the electrical current to a new water heater that has been

installed in the kitchen area of the apartment shown in Figure A-5. The water heater is designed

to operate on 220 volts. It has a total wattage rating of 3500 watts. What are you going to do to supply

this current?

A. Find the nearest duplex receptacle, connect an extension cord to the water heater, and plug it in.

B. Install a new 220-volt circuit with a minimum wire size of No. 12 from the electrical panel to the

water heater.

C. Install a parallel circuit from the nearest 120-volt receptacle in the kitchen to the water heater.

D. Install a parallel circuit from the 220-volt range receptacle in the kitchen to the water heater.

11. In many electronic applications, control transformers reduce the line voltage to a lesser operating volt age. Figure A-6 represents the symbol for a transformer that reduces the line voltage. Based on your

knowledge of the turns ratio and knowing that the primary voltage is 120 V, what is the secondary

voltage?

A. 6 volts

C. 20 volts

B. 12 volts

D. 120 volts

12. Your company has been contracted to install the electrical lighting system in the offices of a small

manufacturing building. The manufacturing company has 277-volt lighting fixtures left over from a

previous expansion. They request that your company use these fixtures in the offices. The service to

the building is 480 volts, three-phase service. What will you need to do in order to supply 277 volts to

these fixtures?

A. Install a new 480-volt three-phase panel with single-phase circuit breakers in it, connecting one

conductor of the lighting circuit to the breaker and the other conductor to the ground terminal.

B. Install one single-phase stepdown transformer to supply the necessary 277 volts.

C. Install one three-phase Wye-Wye or Wye-Delta transformer to supply the necessary 277 volts.

D. Install a new single-phase service to the building.

13. You’ve been contracted to wire a small residence by someone who is doing his own design and

building. The only circuitry he shows on his drawings is the light switching. He has also indicated that

the branch circuit panel will be located next to the service entrance at the exterior location shown in

Figure A-7. All branch circuit “homeruns” will be directed to this location. The homeowner will supply

all lighting fixtures at a later time. The first room that the owner gives you to wire is the kitchen as

shown in Figure A-7. He has marked the location of the countertop receptacles in the kitchen and also

those needed for specialty appliances such as the dishwasher, refrigerator, and range, and has

shown the lighting. From the drawing shown in Figure A-7, which of the following best describes the

circuits you will install in the kitchen?

A. One 120-volt 20-ampere general-purpose circuit to supply the countertop receptacles; one 120volt

20-ampere circuit paralleled

to supply the dishwasher

and the refrigerator;

one 220-volt 50ampere

three-conductor circuit to supply the range

B. Two 120-volt 20-ampere small-appliance circuits to supply the countertop receptacles and kitchen

light; one 120-volt 20-ampere special-purpose circuit to supply the dishwasher; one 120-volt 20ampere

special-purpose circuit to supply the refrigerator;

one 220-volt 50-ampere, three conductor circuit to supply the range

C. One 120-volt 20-ampere general-purpose GFCI-breaker protected circuit to supply the countertop

receptacles and kitchen light; one 120-volt 30-ampere circuit to supply the dishwasher; one 120-volt

30-ampere circuit to supply the refrigerator; one 220-volt 30-ampere circuit to supply the range

D. One 120-volt 20-ampere general-purpose circuit to supply the countertop receptacles; one 120-volt

30-ampere circuit to supply the dishwasher; one 120-volt 30-ampere circuit to supply the refrigerator;

one 220-volt 50-ampere, three-conductor circuit to supply the range

14. Using the information from Question 13 and again referring to Figure A-7, which of the following

best describes the devices you’ll install in the kitchen if you’re attempting to minimize material costs?

Remember that the homeowner will install all lighting fixtures.

A. Six 20-ampere rated GFCI duplex receptacles with plates; two 20-ampere rated single receptacles

with plates; one 50 ampere-rated range receptacle with plate

B. Six 20-ampere rated, grounding-type duplex receptacles with plates; two 20-ampere rated single

receptacles with plates; one 50 ampere-rated range receptacle with plate

C. Six 20-ampere rated GFCI duplex receptacles with plates; two 20-ampere rated single receptacles

with plates; one 50 ampere-rated range receptacle with plate; one single-pole light switch with plate

D. Six 20-ampere rated, grounding-type duplex receptacles with plates; two 20-ampere rated single

receptacles with plates; one 50-ampere rated range receptacle with plate; one single-pole light

switch with plate

15. You’ve finished installing the devices and circuits in the kitchen and are ready for another room. The

dining room, entrance, and outside areas are ready for wiring and the homeowner has given you the

drawing shown in Figure A-8. The homeowner reminds you that you should limit the circuits and wiring

to a required minimum due to budget constraints. Keep in mind that you still have access to the devices

and circuits you installed in the kitchen, as the interior walls aren’t covered up. Based on this information, which of the following statements best describe the circuits you’ll install in the dining room, entrance, and outside areas?

A. One 120-volt 20-ampere general-purpose circuit to supply the dining room receptacles, dining room

light, rear outside receptacle, and rear outside light; one 120-volt 20-ampere general-purpose circuit to

supply the inside receptacle, inside entrance light, front outside receptacle, and front outside light.

B. One 120-volt 20-ampere general-purpose circuit to supply all dining room and entrance-way

receptacles, one 120-volt 20-ampere general-purpose circuit for the lighting, and one GFCI-protected

circuit for the outside receptacles.

C. Supply one half of the dining room receptacles with a parallel circuit from one kitchen small appliance

circuit and the other half of the dining room receptacles with a parallel

circuit from the other kitchen small appliance circuit;

one 120-volt general-purpose 20-ampere circuit to supply the two

outside receptacles (front and back), two inside entrance receptacles, two outside lights (front and

back), and two inside lights (dining room and entrance).

D. No new circuits needed. Supply the dining room, entrance area, and outside devices from the two

small appliance circuits supplied to the countertop receptacles.

Figure A-8—Use this figure to

16. Using the information from Question 15 and again referring to Figure A-8, which of the following best describes the devices you’ll install in the dining room, entrance, and outside area? Remember that

the homeowner will install all lighting fixtures.

A. Five 20-ampere rated duplex receptacles with plates; two 20-ampere rated GFCI duplex receptacles

with weatherproof plates; four 3-way light switches with plates; two single pole light switches with

plates

B. Seven 20-ampere rated duplex receptacles with plates; four 3-way light switches with plates;

two single-pole light switches with plates

C. Five 20-ampere GFCI duplex receptacles with plates; two 20-ampere rated duplex receptacles

with plates; four 3-way light switches with plates; two single-pole light switches with plates

D. Seven 20-ampere rated duplex receptacles with plates; two 20-ampere rated GFCI receptacles

with weatherproof plates; four 3-way light switches with plates; two single-pole light switches with

plates

17. You’ve finished installing the devices and circuits in the dining room and the entrance and are ready

for another room. The owner has finished the bathroom. He gives you the revised drawing shown in

Figure A-9 and asks you to please complete the wiring to the bathroom, again reminding you that you

should limit the circuits and wiring to a required minimum due to budget constraints. Which of the

following is the best method for installing the circuits in the bathroom?

A. Supply the bathroom with the necessary power by paralleling one of the receptacles in the dining

room to the receptacle and light in the bathroom.

B. Supply the bathroom with the necessary power by paralleling the refrigerator circuit to the receptacle

and light in the bathroom.

C. Supply the bathroom with the necessary power by paralleling one of the receptacles in the entrance

area to the receptacle and light in the bathroom.

D. Install one new 120-volt 20-ampere general-purpose circuit for the receptacle and light in the

bathroom.

18. using the information from Question 17 and referring to Figure A-9, which of the following best

describes the devices you would install in the bathroom?

A. Two 20-ampere rated duplex receptacles with plates; one single-pole light switch with plate

B. One 20-ampere rated duplex receptacle with plate; one single-pole light switch with plate

C. Two 20-ampere rated GFCI duplex receptacles with plates; one single-pole light switch with plate

D. One 20-ampere rated GFCI duplex receptacle with plate; one single-pole light switch with plate

19. The homeowner has finished roughing in his two bedrooms and has given you the revised drawing

shown in Figure A-10. He asks that you make any necessary changes to the bathroom wiring and to

concentrate on bedroom and closet #1 next, again reminding you that you should limit the circuits and

wiring to a required minimum due to budget constraints. You immediately notice that after adding the

sliding door from bedroom #1 into the bathroom, he modified the drawing to change the bathroom

light switch to a 3-way switching system. Which of the following best describes the methods you’ll use

to install circuits during this phase of construction?

A. Remove the two-conductor Romex cable from the bathroom light switch and install the necessary

conductors for 3-way switching operation; install one new 120-volt 20-ampere circuit to

bedroom #1 to supply the receptacles, bedroom light, and closet light

B. Use the same two-conductor Romex cable from the bathroom light switch for the 3-way switching

operation; supply bedroom and closet #1 with the necessary power by paralleling the bathroom

circuit to the receptacles and lights in bedroom and closet #1

C. Remove the two-conductor Romex cable from the bathroom light switch and install the necessary

conductors for 3-way switching operation; supply bedroom and closet #1 with the necessary power

by paralleling the dining room circuit to the receptacles and lights in bedroom and closet #1

D. Use the same two-conductor Romex cable from the bathroom light switch for the 3-way switching

operation; install one new 120-volt 20-ampere circuit to bedroom #1 to supply the receptacles,

bedroom light, and closet light

20. Using the information from Question 19 and refering to Figure A-10, which of the following best

describes the devices you’ll install when modifying the bathroom and wiring bedroom and closet #1?

Remember that the homeowner will install all lighting fixtures.

A. Four 20-ampere rated duplex receptacles with plates; two single-pole light switches with switch

plates

B. Four 20-ampere rated duplex receptacles with plates; remove the single-pole light switch in the

bathroom and use it in bedroom #1; one single-pole light switch with switch plate; two 3-way light

switches with switch plates

C. Four 20-ampere rated duplex receptacles with plates; two single-pole light switches with switch

plates; two 1-way light switches with plates

D. Four 20-ampere rated duplex receptacles with plates; two single-pole light switches with switch

plates; three 3-way light switches with switch plates

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