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WorksheetsElectrical Safety Quiz
Total questions: 81
Worksheet time: 1hrs 11mins
When working outdoors, before using an extension cord to operate a power tool, the extension cord should be...
Routed away from sharp objects
Routed around vehicle travel routes
Inspected for damage
All of the above
Cord sets and portable electric tools must be visually inspected...
For the defect to be field repaired
Unless they were used by the previous crew
Before each use
To make sure the pinch points haven't exposed any conductors
Work can be performed using power tools in wet locations if...
A personnel have been informed of the risk
A waiver of liability is signed
Absolutely necessary
The tool uses a low-voltage isolation transformer
Which of the following is NOT considered an electrical hazard by OSHA?
Arc Fault
Arc Blast
Power Tool Injury
Shock
Per OSHA 29 CFR 1910.305(g)(1)(IV) which of the following is an acceptable use of a flexible cord?
You should have adequate working space when moving conduit in order to avoid contact with...
People
Equipment
Energized objects
All of the above
Keeping your work area clean will help...
Prevent accidents
Decrease work production
Both A and B
None of the above
Which of the following is NOT a true statement regarding a lockout/tagout procedure?
Before lockout/tagout is applied, all workers in the affected area must be notified
If a worker is not present to remove his own lock, any co-worker can remove it as long as he first makes sure it's safe
Lockout/tagout is the process of removing the source of electrical power and installing a lock and tag that prevents the power from being turned ON
Lockout/tagout should be used whenever you are performing service or maintenance around any machine where you could be injured by unexpected start-up or release of stored energy
What is the term for the electrical force that occurs when two charges have a difference in potential?
Watt
Charge
Current is measured in...
Volts
Amperes
Watts
Potential
A duct heater has a nameplate rating of 6.32 KW @ 250 volts. This duct heater will draw amperes when operated at the nameplate rated voltage.
25.28
9.89
10.11
39.56
30.0
If resistance is lowered in a simple circuit, what will the current do?
Fluctuate
Remain the same
Go up
Go down
An incandescent lamp consumes of power at 110 volts where the manufacturer's stamp on the lamp shows 100 watts @130 volts.
118.2
121
71.6
84.6
100
Referring to the Ohm's Law formula I=E/R, in a DC circuit, the current is directly proportional to the voltage and proportional to the resistance.
Conversely
Directly
Inversely
Equally
Voltage is similar to ___ in a water pipe.
Flow
Pressure
Temperature
Size
If the voltage is lowered in a simple circuit, what will the current do?
Fluctuate
Go down
Remain the same
Go up
What is the resistance of a 6" PVC heater if the nameplate supplies the following information: 28 amps 250Volts
8.5714
3.146
47.2456
8.9286
73.4694
A particular load is rated to use 2.2kW at 240 volts. This load is connected to a 2-pole breaker in a panel using 12 AWG conductors. How much current will this load draw?
A. 11.5
B. 9.2
C. 10.9
D. 26.2
E. 20
A 750-watt heating element will draw __ amps at 120 volts. The element is rated to operate at 120 volts.
What is the current drawn by a 240-volt, 7.5 kW electric furnace when operated at 240 volts?
A. 31.25
B. 36.06
C. 7.68
D. 27.08
AC is an abbreviation for...
A. Alternating Current
B. Always Charged
C. Action Calibration
D. Amplitude Cancellation
A standby power system generator is typically...
Which of these statements correctly describes the basic law of magnetism?
Charged poles repel and uncharged poles attract
Unlike poles repel and like poles attract
North poles repel and south poles attract
Like poles repel and unlike poles attract
A standby power system has been installed at a dwelling. The NEC requires the electrician to place a sign at the service-entrance equipment. What information about the standby power system must appear on the sign?
Size and voltage
Type and location
Location and power output
Fuel type and duration
When portable generators are stored until needed by a homeowner or small business owner to operate cord-connected equipment, these are commonly referred to as __ power sources.
Standby
Backup
Emergency
Temporary
According to NEC Section 240.4(B), if the ampacity of a conductor does not match up with a standard fuse rating, what are you allowed to do?
Use the next higher standard rating
Derate the conductor to match the fuse
According to NEC Section 240.4(B), if the ampacity of a conductor does not match up with a standard fuse rating, what are you allowed to do?
Use the next higher standard rating
Derate the conductor to match the fuse
Install a smaller conductor
Use any rating that is within 50% of the ampacity
Refer to the Article 100 definition for continuous load in the NEC. According to 210.20(A) the overcurrent protection for a continuous load shall be sized at not less than ___ of the current drawn by the load.
Branch circuits are rated according to...
the size of the wire used for the circuit
the amperage rating of the overcurrent device
the voltage rating of the circuit
All of the above
GFCI is an abbreviation for...
Governed by Federal and International
Grounded Fault Circuit Interface
Ignoring the effects of voltage drop, a 20-ampere branch circuit requires (a) conductors.
Branch circuits that serve a __ are required to be rated at 20 amperes when installed in a house.
Laundry Room
All Only
Kitchen
Bathroom
II & III only
In a dwelling (such as your house) how many 20-amp branch circuits are required by the NEC to supply power to an area where a washing machine is to be plugged into a receptacle?
at least one
at least three
at least two
none are required
What is the minimum number of 20-ampere branch circuits for small appliances required in a residence?
(a)
The NEC defines a branch circuit as...
the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)
a minimum of two circuit conductors protected by an overcurrent protective device
all conductors that are connected to a load
none of these
Where 10 AWG THHN/THWN copper circuit conductors are connected to a 15-amp circuit breaker, the circuit is considered to be a ___ amp branch circuit.
25
35
20
30
15
For a single-family dwelling with a total of 3500 square feet of occupied area, the minimum number of 15-ampere lighting branch circuits is...
7
6
5
8
In a restaurant, receptacles should be installed along a 15-foot long kitchen countertop per the minimum requirements in the NEC.
Which areas in a residence require a switch-controlled lighting outlet instead of a switch-controlled receptacle?
Any of these
porch
bathroom
hallway
How many 20-amp small-appliance branch circuits are required by the NEC to supply power to countertops in commercial restaurant kitchens?
none are required
at least three
at least one
at least two
How many cubic inches are contained in a junction box that measures 10" X 12" X 6" deep?
720
600
26.83
132
Where a branch circuit is protected with a 30-amp circuit breaker, the smallest circuit conductors that can be installed are AWG copper.
14
10
12
none of these
The fewest number of receptacles that can be installed outside on a house is...
1
2
3
0
Which of these tools should be used to cut bolts?
A
B
C
D
E
The tool shown is a...
Wood (paddle) bit
Masonry Drill Bit
Hole Saw
High-Speed Drill Bit
Step-Drill Bit (Unibit)
In the tool diagram, which one is the hex key (allen) wrenches?
A
B
Which tool(s) could be (properly) used to "mark" or make a dent in metal so that a hole can be drilled at exactly that point with a power drill and drill bit?
Center Punch
Phillips Screwdriver
Scratch Awl
Straight Pick
Any of these
Which of these wrenches would be safer to use to loosen a frozen/stuck nut?
Open-Ended Wrench
12 Point Box-End Wrench
6-Point Socket
Flare Nut Wrench
Which of these hand tools are diagonal cutting pliers?
What does the "Sp" symbol represent?
Switch with pilot lamp
Power switch
Perimeter switch
Pull chain switch
A neutral conductor shall not be used for more than what kind of circuit?
A series circuit
A parallel circuit
The continuity of a ______ shall not depend on a connection to a metallic enclosure, raceway, or cable armor.
Which are is not covered in Article 200?
Lighting
Grounded conductors
Identification of terminals
Identification of grounded conductors
By means of identifying terminals, a grounded conductor shall be connected to what color?
Blue
Black
White
Brown
Which device terminals are excluded from section 200.10 A?
Appliances
Receptacles
Panelboards
Screw devices
What does Article 200.7 not cover?
What size, or larger, shall be permitted to employ an external ridge on the grounded conductor?
2 AWG
4 AWG
8 AWG
14 AWG
Which article identifies the wiring of device equipment grounding conductor terminals?
234.15
250.12
250.126
256.12
How many circuits are in the home?
Which bedrooms are on the same circuit?
How many GFCI circuits are in the home?
3
4
5
6
Which NEC articles cover bathroom receptacles?
214.12 and 231.6
213.10 and 213.8
210.89 and 210.90
210.11 and 210.8
How many receptacles are outside?
1
2
3
4
According to the NEC Table 300.5, the minimum cover is from the top of the wiring method to the finished surface. For a future parking lot with 6" of concrete covering the present level of dirt using 3 1/2" (4" OD) conduit, how deep do you need to dig the trench?
24"
22"
20"
28"
Branch-circuit conductors at outlet boxes are required to have at least how many inches of free conductor for making splices and connections? The length of the conductor is measured from the point in the box where it emerges from its raceway.
A. 12 inches
B. 8 inches
C. 6 inches
D. 4 inches
According to building codes and the NEC, unless special provisions are made, electrical wall boxes shall not be mounted back to back in the same stud space in fire-rated walls because:
A. it reduces the fire resistance of the wall
B. there is not sufficient room in the wall cavity to mount electrical wall boxes back to back
C. sound may be transmitted from room to room
D. all of the above
According to the NEC, what must be installed wherever outlets are required?
A. Box
B. Device
C. Fixture
D. Switch
Boxes are to be mounted in non-combustible walls so that the box is flush with the finished wall surface. However, the NEC permits these boxes to be set back how far from the finished wall surface?
A. 3/16"
B. 1/8"
C. 1/2"
D. either A or B
Identify the single pole switch.
An electrical company has a payroll of 72 people. Forty-nine electricians make $20.50 per hour, 11 electrical apprentices make $18.00 per hour, laborers make $14.25 per hour, and three clerks make $10.75 per hour. What is the total amount earned each week if they all work a 40-hour week?
$55,510
$55,320
$54,520
$61,520
An electrician just wired 4 houses and used the following material: The first house used 178 feet of 12-3/G and 1137 feet of 12-2/G. The second house used 213 feet of 12-3/G and 1291 feet of 12-2/G. The third house used 135 feet of 12-3/G and 1213 of 12-2/G. The fourth house used 169 feet of 12-3/G and 1172 feet of 12-2/G. How many total feet of 12-2/G and 12-3/G was used?
695 feet 12-3/G, 4813 feet 12-2/G
694 feet 12-3/G, 4694 feet 12-2/G
694 feet 12-3/G, 4812 feet 12-2/G
695 feet 12-3/G, 4812 feet 12-2/G
For a length of Romex cable 237 feet in length, 80 staples were used. The staples are equally spaced. One staple is placed at the beginning and one at the end. How far apart are the staples placed?
34 inches
35 inches
36 inches
37 inches
Four rooms of a house contain lamps that have the following wattages: The living room has 4-150 watt lamps; the dining room has 5-75 watt lamps; the master bedroom has 2-75 watt lamps and 4-150 watt lamps; the bathroom has 3-65 watt lamps. What is the total load when all the lamps are operating?
A. 1,885 watts
B. 1,920 watts
C. 1,960 watts
D. 1,985 watts
A total load of 28,800 watts is distributed equally over 15 circuits. What is the load per circuit in watts?
A. 1,860
B. 1,460
C. 1,920
D. 1,820
Round the following value to the nearest tenth 6.88.
A. 7
B. 6
C. 6.8
D. 6.9
If the gas tank of the company truck holds 22.5 gallons and the truck averages 15.75 miles per gallon, the truck can travel miles on half a tank of gas.
An electrical contractor employs 240 electricians. The number of electricians represents 75% of the total number of employees. What is the total workforce?
A. 180
B. 215
C. 225
D. 320
The electrician had a piece of conduit 76 3/4 inches long. To fit the piece between two electrical boxes, he had to cut 9/16" off one end. After the piece was cut off, the conduit was inches in length.
A. 76 3/16
B. 75 1/8
C. 76 1/2
D. 76 7/16
The company truck measures 239 1/2 inches long. The company garage is 21 feet and 9 inches inside. The garage door takes up an additional 4 inches of interior space. How many feet and inches of space will be left after parking the truck inside?
A. 19 1/2"
B. 15'1/2"
C. 1'1/2"
D. 3'51/2"
What color should flexible cords be identified as?
A. black
B. only gray
C. only white
D. white or gray
Which of these are not a means of identifying grounded conductors?
A. It should be MC cable
B. A continuous white outer finish
