Electrical Practice Exam 2
The connection between the grounded circuit conductor and the equipment grounding conductor at the service is which of the following: a. A main bonding jumper b. A grounding connector c. Service grounded conductor d. None of the above
a. A main bonding jumper
Taps and splices shall not be located within which of the following fixture components: a. Stems and arms b. Splice boxes c. Ring assembly d. None of the above
a. Stems and arms
What type of transformer is used to produce 24 volts? a. Step-down b. Delta c. Auto transformer d. None of the above
a. Step-down
Which of the following, minimum rebar size, can be used for grounding? a. # 1 b. # 2 c. # 4 d. # 6
c. # 4
Refer to the diagram below. Identify the air conditioning plug. a. 125 V @ 15 A b. 250 V @ 15 A c. 250 V @ 20 A d. 250 V @ 50 A
c. 250 V @ 20 A
Refer to the diagram below. Identify the air conditioning plug. a. 125 V @ 15 A b. 250 V @ 15 A c. 250 V @ 30 A d. 250 V @ 50 A
c. 250 V @ 30 A
The maximum voltage drop of two feeders and three branch circuits to the farthest outlet in a wiring system should not exceed: a. 2% for the feeders b. 3% for the branch circuits c. 5% d. 10% maximum
c. 5%
AC - DC general use snap switches may be used to control inductive loads that do not exceed the rating of the voltage of: a. 5% b. 45% c. 50% d. 100%
c. 50%
A fixture supported by the screw shell of a lampholder may not exceed which of the following: a. 2 - 1/2 pounds b. 4 pounds c. 6 pounds d. 10 pounds
c. 6 pounds
Aluminum enclosures and fittings are allowed to be used with which: a. PVC conduit b. Electrical nonmetallic tubing c. Ferrous conduits d. Steel electrical metal tubing
d. Steel electrical metal tubing
What percent of the input is the output, if a motor receiving 12 horsepower delivers 9 horsepower of work? a. 75% b. 80% c. 85% d. 90%
a. 75% 9/12 = 0.75 or 75%
Refer to the diagram below. Identify the air conditioning plug. a. 125 V @ 15 A b. 250 V @ 15 A c. 250 V @ 30 A d. 250 V @ 50 A
a. 125 V @ 15 A
Three resistors, rated 5, 10, and 15 ohms respectively, are connected in parallel, will produce a combined total resistance of: a. 2.7 ohms b. 3.33 ohms c. 18.33 ohms d. 30 ohms
a. 2.7 ohms 1/R(total) = 1/R1 + 1/R2 + 1/R3 1/R(total) = 1/5 + 1/10 + 1/15 1/R(total) = 0.367 R(total) = 1/0.367 = 2.7 ohms
In general, electrical nonmetallic tubing (ENT) shall be securely fastened at intervals not exceeding ______. a. 3 feet b. 4 feet c. 5 feet d. None of the above
a. 3 feet
One watt equals how many BTU's? a. 3.4131 b. 4.1342 c. 1.3413 d. 3.3421
a. 3.4131 1W = 3.4 BTU/hr
What is the highest voltage permitted for a Class 1 power limited circuit? a. 30 volts b. 1000 volts c. 24 volts d. None of the above
a. 30 volts
A three-phase squirrel cage motor operates at 460 volts and 65 amps, when running at full load, which means that the horsepower rating for this motor based on the NEC is which of the following: a. 50 horsepower b. 60 horsepower c. 40 horsepower d. 30 horsepower
a. 50 horsepower The horsepower rating for the motor will be hp. Table 430.250
Enclosures around electrical equipment shall be considered accessible if they meet which of the following conditions: a. Are controlled by combination locks b. Are surrounded by fencing that is 7 feet tall c. Both A & B d. None of the above
a. Are controlled by combination locks
When connecting 240 volts, what wires would you use? a. Black and red b. White and blue c. Brown and black d. None of the above
a. Black and red
Which of the following is considered hazardous when present in quantities sufficient to create the potential for combustion for Class II locations: a. Combustible dust b. Ignitable vapors c. Combustible Oil d. None of the above
a. Combustible dust
Yellow wiring is normally used in what circuit? a. Cooling b. Heating c. It is never used d. Both heating and cooling
a. Cooling
An ohmmeter is used on what type of circuit? a. De-energized circuits b. Under 110 volts c. Over 220 volts d. It is never used
a. De-energized circuits
Removing which of the following from conduit threads will ensure electrical continuity between conductors: a. Enamel b. Copper ends c. Rubber coating d. All of the above
a. Enamel
Refer to the diagram below. Identify the fuse type a. Fusetron b. Two element renewable c. Cartridge type d. None of the above
a. Fusetron
A circuit conductor that is intentionally grounded is known as? a. Grounded conductor b. Conductor c. Grounding conductor d. Grounding electrode
a. Grounded conductor
Either white or brown wiring is generally used for which circuit? a. Heating b. Cooling c. Heating and cooling d. It is never used
a. Heating
A disconnecting means for a controller is also permitted to be the disconnecting means for the motor and driven machine, even where out of sight of the motor and driven machine: a. In an industrial building with qualified service personnel, if capable of being locked in the open position b. If capable of being locked in the open position c. In commercial and industrial buildings with qualified service personnel d. If provided with an alarm to indicate when the disconnect is closed
a. In an industrial building with qualified service personnel, if capable of being locked in the open position
Type AC cables are allowed for which of the following uses: a. In concealed work b. In wet locations c. For aerial service power d. None of the above
a. In concealed work
The primary role of a supplementary overcurrent protective device is best described by which of the following statements? a. Is not a substitute for branch circuit overcurrent protection b. Is required to be installed in light fixtures c. Must be installed in any branch circuit system d. Shall not be required on circuits rated more than 50 amps
a. Is not a substitute for branch circuit overcurrent protection
The neutral conductor in an electrical installation has which of the qualities: a. It carries the unbalanced current b. It is the white conductor only c. It does not apply ampacity correction d. All of the above
a. It carries the unbalanced current
Where would a contractor install a GFCI in a bathroom? a. Next to the basin b. Near the floor c. Just to the side of the mirror d. Next to the shower
a. Next to the basin
When adding a fuse panel, the connection to the main panel is called? a. Power takeoff b. Subpanel c. Fuse panel d. None of the above
a. Power takeoff
Switches, panel boards, wire wats and transformers are allowed to be mounted above or below one another if which of the conditions exists: a. They don't extend more than 6 inches beyond the front of the equipment b. No piece of equipment is rated over 300 volts c. They are flush along the front edge d. None of the above
a. They don't extend more than 6 inches beyond the front of equipment
Where are flexible cords, not allowed for use: a. To replace fixed wiring of a structure b. Hoists c. Cranes d. All of the above
a. To replace fixed wiring of a structure
Grounding equipment with a 40 amp automatic overcurrent device in the circuit ahead of the equipment, requires a minimum size copper equipment grounding conductor of which of the following sizes: a. #8 b. #10 c. #12 d. None of the above
b. #10
The frame of an electric range may be considered a grounding source if it is connected to the grounded conductor of a 120/240 volt branch circuit which is not less than: a. #6 copper b. #10 copper c. #8 aluminum clad d. None of the above
b. #10 copper
When computing ampacity, a fraction of an ampere is considered only when it is: a. Over 75% b. 0.5 of larger c. 0.25 to 0.5 d. Never
b. 0.5 or larger
At what voltage does an underwater pool light requires a light GFCI? a. 10 volts b. 15 volts c. 120 volts d. 220 volts
b. 15 volts
Find the size EMT nipple required to enclose 3 each 500 kcmil THHN conductors between two panels. a. 1 1/2 inch b. 2 inch c. 3 inch d. 3 1/2 inch
b. 2 inch
The voltage drop allowed from the electric meter to the air conditioner is a. 1% b. 2% c. 10% d. 12%
b. 2%
Refer to the diagram below. Identify the air conditioning plug. a. 125 V @ 15 A b. 250 V @ 15 A c. 250 V @ 30 A d. 250 V @ 50 A
b. 250 V @ 15 A
If a transformer vault is not protected by an automatic sprinkler system, then it must have a minimum fire resistance and structural strength of which periods of time: a. 2 hours b. 3 hours c. 4 hours d. 6 hours
b. 3 hours
Unless a recessed light fixture is marked as suitable for direct contact with insulation, thermal insulation cannot be installed within which distances from a recessed light fixture: a. 1 -1/4 inches b. 3 inches c. 6 inches d. 8 inches
b. 3 inches
In a commercial office building, the maximum size permitted for flexible metallic tubing installed is: a. 1 inch b. 3/4 inch c. 1/2 inch d. 1/4 inch
b. 3/4 inch
Unless an expected load as specified by the Code, a conductor rated 56 amperes shall be protected by a _______ fuse. a. 50 b. 60 c. 70 d. 80
b. 60
Which of these shall not be used in wet or damp locations? a. Open wiring b. AC armored cable c. Both A & B d. None of the above
b. AC armored cable
Junction boxes shall be _______. a. Visible b. Accessible c. Inside removable panels d. None of the above
b. Accessible
According to Electrical Code, electrical equipment shell be installed: a. According to needs of customers b. According to the Electrical Code c. According to the subcontractor d. None of the above
b. According to the Electrical Code
On a 110-volt circuit, what color conductor is used for hot wire? a. White b. Black c. Green d. Yellow
b. Black
Switches rated at 20 Amps or less and connected to aluminum wires shall be listed for that purpose and marked _______. a. ALU b. CO/ALR c. Multi wire d. AL/CU
b. CO/ALR
The inside of a spray booth is considered which of the following locations: a. Class I, Division 1 b. Class I, Division 1, or Class II, Division 1 c. Class III, Division 1 d. None of the above
b. Class I, Division 1, or Class II, Division 1
In electrical construction, mica is most commonly used for which of the following: a. In switchboard panels b. Communicator bus separators c. Conductor insulators d. None of the above
b. Communicator bus separators
Photovoltaic system currents are considered to be which of the following: a. Inverted currents b. Continuous currents c. Limited currents d. Stand alone systems
b. Continuous currents
To activate timed fan, you need _________. a. Thermostat b. Fan control c. Limit switch d. Joint filler
b. Fan control
To control humidity you should use a: a. Thermostat b. Humidistat c. Barometer d. Humidifier
b. Humidistat
Lighting, that is required for a hoist pit, should meet which of the following requirements: a. Connections must be run in flexible metal conduit b. It will not be connected to the load size of the ground-fault circuit interrupter c. The switch will not be readily accessible d. All of the above
b. It will not be connected to the load size of the ground-fault circuit interrupter
What does the abbreviation LRA mean? a. Locked rotor angles b. Locked rotor amperes c. Locked rotor arms d. None of the above
b. Locked rotor amperes
The motor branch circuit fuse size, for a general motor application, must be determined by referring to: a. NEMA standards b. NEC tables c. NEC FPNs d. The motor nameplate listing
b. NEC tables
The white conductor is normally: a. Hot wire b. Neutral wire c. Ground wire d. All of the above
b. Neutral wire
In determining load on the volt-ampere per square foot basis the _______ the building shall be used for each floor. a. Inside dimensions of b. Outside dimensions of c. Height of d. Number of rooms in
b. Outside dimensions of
Which of the following is not a file type: a. Mill b. Tubular c. Bastard d. Half round
b. Tubular
A multi-wire branch circuit that supplies more than one device on the same yoke in a dwelling unit, must be protected by? a. One fuse b. Two single-pole circuit breakers that are tied together c. Two single-pole circuit breakers that operate independently d. One single-pole non-fused disconnect
b. Two single-pole circuit breakers that are tied together
What colors are normally used for 120-volt wiring? a. Brown, orange, yellow b. White, black, green c. Blue, white, black d. None of the above
b. White, black, green
Floor boxes have to meet the same requirements for spacing as wall receptacles if the box is: a. 24 inches from the wall b. Within 18 inches of the wall c. Within a 12-inch radius of the wall d. Floor boxes never have to meet wall receptacle requirements
b. Within 18 inches of the wall
Based on the display below, Voltage A should be which of the following? 120 volts ))) Voltage A 100 turns ))) 1,000 turns a. 120 volts b. 240 volts c. 1,200 volts d. 12,000 volts
c. 1.200 volts According to turns ratio 100/1000, the turns ratio of a transformer is 1/10 --> 1/10 = 120/Voltage A --> Voltage A = 120 * 10 = 1200 Volts
Receptacles must be of the grounding type if they are installed on: a. 40 amp circuit b. 30 amp branch circuit c. 15 and 20 amp branch circuits d. None of the above
c. 15 and 20 amp branch circuits
Direct burial of nonmetallic conduit without any other protection in a parking lot must be buried at least ____ deep. a. 9 inches b. 18 inches c. 24 inches d. 4 feet
c. 24 inches
What is the most common law voltage? a. 12 volts b. 16 volts c. 24 volts d. 48 volts
c. 24 volts
If 240 Volts is applied to a conductor, which supplies a 10 amp load 500 feet out and the conductor has a resistance of 1.45 ohms per 1000 feet, then the total voltage drop in the circuit conductors would be: a. 10% b. 15% c. 6% d. 1.45%
c. 6% VD = (2 * L * R * l) / 1000 VD = (2 * 500 * 1.45 * 10) / 1000 VD = 14,500 / 1,000 = 14.5 V VD% = (VD / Source Voltage) * 100 VD% = (14.5V / 240) * 100 VD% = 6% Note: L- One-way wire length (feet) R - Resistance of wire (ohm/kft) Chapter 9, Table 8 l - Load current (amperes)
Which of the following listed circuit breakers is NOT a standard ampere rating listed in the NEC? a. 110 ampere b. 90 ampere c. 75 ampere d. 60 ampere
c. 75 ampere
Based on the figure displayed below, the total resistance in ohms would be which of the following: ^ Rt R1 - 15 ohms /\/\/\ R1 - 25 ohms a. 3.75 b. 4.0 c. 9.4 d. 40
c. 9.4 R(total) = (R1 * R2) / (R1 + R2) R(total) = (15 * 25) / (15 + 25) R(total) = 9.4 ohms
Which of these receptacles, listed below, may be connected to small appliance circuits? a. A garage ceiling receptacle for a garage door opened b. A living room receptacle for a television set c. A receptacle in the kitchen for an electric clock d. None of the above
c. A receptacle in the kitchen for an electric clock
Solid dielectric insulated conductors in permanent installations, operating over 2000 volts, should: a. Be shielded b. Have ozone-resistant insulation c. Both A & B d. None of the above
c. Both A & B
Which of the following is permitted to be connected ahead of service switches: a. Current-limiting devices b. Surge arrestors c. Both A & B d. None of the above
c. Both A & B
Which of the following line type should edges that are invisible in an electrical drawing be represented by: a. Solid b. Dotted c. Broken d. All of the above
c. Broken
The minimum electrical requirements for a dwelling to meet code is: I. Two small appliance circuits II. One laundry circuit III. 3 volt-amps per square foot IV. One 8 kW range connection a. I & II b. III only c. I, II, & III d. All of the above
c. I, II, & III
To prevent toxic fumes from entering conduit, use _______. a. Nothing b. Teflon tape c. Sealing compound d. Joint filler
c. Sealing compound
Which of the following provides speed-limiting devices? a. Synchronous motors b. Polyphase motors c. Series motors d. Compound motors
c. Series motors
When installed in a ventilated channel cable tray with a 4-inch inside width, the sum of the diameters of all of the single conductors: a. Shall be less than the width of the channel b. Shell be permitted to total 8 inches or less c. Shall not exceed 4 inches d. None of the above
c. Shall not exceed 4 inches
Why would an electric panel be locked down and tagged? a. Inspector located a bad switch b. Motor is not working on the other end c. Shock hazard if energized d. Untrained personnel in area
c. Shock hazard if energized
Each kitchen in a two-family dwelling unit requires a minimum of which of the following in order to meet the small appliance load: a. Two 15 amp circuits b. One 20 amp circuits c. Two 20 amp circuits d. Four 20 amp circuits
c. Two 20 amp circuits
What is the total number of receptacles required to serve the bathroom area for a single-family dwelling with 2050 square feet of living space and includes a kitchen, two bedrooms, a living room, dining room, and a bathroom with 7 feet of counter space including the sink? a. 4 b. 3 c. 2 d. 1
d. 1
A lamp that is 1000 watt, 120-volt will use the same amount of energy as a 14.4 ohm resistor at which of the following: a. 1200 watts b. 240 volts c. 144 volts d. 120 volts
d. 120 volts I = P/E = 1000/120 = 8.333 Amps V = I * R = 14.4 * 8.333 = 120 Volts
Refer to the diagram below. Identify the air conditioning plug. a. 125 V @ 15 A b. 250 V @ 15 A c. 250 V @ 30 A d. 250 V @ 50 A
d. 250 V @ 50 A
The amperage required for an 8 kW to 12 kW oven is: a. 10 amps b. 20 amps c. 30 amps d. 40 amps
d. 40 amps Taking the highest number (12 kW), the amperage required is 40-amps.
What is the maximum number of overcurrent devices allowed in one branch circuit panel? a. 16 b. 28 c. 40 d. 42
d. 42
The minimum total circuit ampacity required to supply an air conditioning motor compressor unit which consumes 10,000 volt amperes of power at a line voltage of 240 volts is ____________ amperes. a. 41 b. 50 c. 51 d. 52
d. 52 I = P/E = 10,000 VA. 240 volts = 41.6 amperes NEC section 440.32. 125 per cent of 41.6 = 52 amperes. NEC section 440.32
If an enclosure is supported by a suspended ceiling system, then it shall be fastened to the framing by: a. Screws b. Rivets c. Bolts d. All of the above
d. All of the above
Low voltage equipment in a hospital that comes in frequent contact with people's bodies must be: a. Able to operate at an electrical potential of 10 volts or less b. Approved as intrinsically safe c. Be moisture resistant d. All of the above
d. All of the above
The size of an electrical conductor supplying a circuit is decided by: a. Amperage b. Voltage c. Length d. All of the above
d. All of the above
What is the disadvantage of BX cable? a. It should not be used in damp locations b. It can cut insulation c. For interior use only d. All of the above
d. All of the above
What is the separation distance from non-current-carrying metal parts of electrical equipment to lightning protection conductors? a. 6 feet through the air b. 3 feet through dense materials c. 3 feet through concrete d. All of the above
d. All of the above
In a commercial building, which of the following locations must have GFCI protection: a. The hallway b. Outdoor receptacle c. Bathroom receptacles d. Both B & C
d. Both B & C Commercial buildings must have 125 Volts GFCI receptacles in bathrooms, kitchens, rooftops, outdoors, and sinks.
Which of the following statements listed below is considered mandatory by the NEC: a. See UL Standard 1699 on Arc-Fault Circuit Interrupters b. NFPA 70e c. FPN: For conductors exposed to deteriorating agents, see 310.9 d. Circuits and equipment shall comply with 820.3(A) through 820.3(G)
d. Circuits and equipment shall comply with 820.3(A) through 820.3(G)
How should cable trays be supported? a. At intervals of 12 feet b. At intervals of 14 feet c. At intervals of 20 feet d. In accordance with the installation instructions
d. In accordance with the installation instructions
Which functions do Grounding electrodes perform? a. Prevent current flow into the earth b. Absorb stray currents c. Return neutral current to the earth d. Make an electrical connection to the earth
d. Make an electrical connection to the earth
Any 125 volt single-phase receptacles must be protected by ground fault circuit interrupters if they are within which of the following distances from the inside wall of a hot tub: a. 15 feet b. 13 feet c. 12 feet d. None of the above
d. None of the above
What is the minimum service load for each individual mobile home in a mobile home park? a. 12,000 volts-amperes b. The greater of 14,0000 volts-amperes or the calculated load c. 16,000 volt-amperes d. None of the above
d. None of the above
The grounding electrode conductor connection to a driven ground rod should be: a. Made with wire taps b. Accessible c. Direct-buried d. Not required to be accessible
d. Not required to be accessible
The conductors connecting to motor controllers and to control devices are required to be: a. Copper, aluminum, or copper-clad aluminum conductors b. Only copper-clad aluminum conductors c. Copper or copper-clad aluminum conductors d. Only copper conductors unless identified for other materials
d. Only copper conductors unless identified for other materials