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Quizzes > Quizzes for Business > Construction

Master the Electrical Trade Knowledge Quiz

Sharpen your wiring expertise with this quiz

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art display promoting an Electrical Trade Knowledge Quiz.

The Electrical Trade Knowledge Quiz helps you practice wiring, safety, and code rules with 15 quick multiple-choice questions. Use it to spot skill gaps before the exam. For more practice, try the fundamentals quiz or the code compliance quiz .

According to Ohm's Law, what current flows when 12 volts is applied across a 4 Ω resistor?
4 A
3 A
2 A
48 A
Ohm's Law states I = V / R. Dividing 12 V by 4 Ω yields 3 A of current.
In U.S. residential wiring, which color is used for the equipment grounding conductor?
Red
Black
Green
White
The National Electrical Code designates green (or green with yellow stripe) as the equipment grounding conductor color.
Which American Wire Gauge (AWG) size is commonly used for a 15 A branch circuit in residential wiring?
14 AWG
10 AWG
12 AWG
16 AWG
14 AWG copper conductors are rated for up to 15 A and are the standard for 15 A branch circuits in residences.
What is the primary function of a circuit breaker in an electrical panel?
To regulate voltage output
To convert AC to DC
To step down voltage
To protect against overcurrents and short circuits
Circuit breakers are designed to interrupt the circuit when current exceeds safe levels, protecting wiring from overloads and shorts.
Which personal protective equipment (PPE) is essential when performing live electrical work?
Dust mask
Insulated rubber gloves
Hearing protection
Steel-toe boots
Insulated rubber gloves protect against electrical shock by preventing current from passing through the body when working on live circuits.
Which statement correctly describes a series circuit?
Power is divided equally regardless of resistance
Current is the same through each component
Voltage is the same across each component
Resistance decreases as you add more resistors
In a series circuit, the same current flows sequentially through each component because there is only one path for current flow.
According to code, what is the typical trip threshold for a GFCI protecting a kitchen countertop outlet?
15 mA
30 mA
6 mA
5 mA
GFCIs are designed to trip at around 5 mA of leakage current to provide protection against ground faults and shock hazards.
What is the total resistance of a 6 Ω and a 3 Ω resistor connected in parallel?
2 Ω
1.5 Ω
4 Ω
9 Ω
Parallel resistance is found by 1/R = 1/6 + 1/3 = 0.5, so R = 2 Ω.
What is the primary purpose of the neutral conductor in an AC distribution system?
To carry only fault currents
To provide a return path for current back to the source
To ground all exposed metal parts
To step down voltage to appliances
The neutral conductor completes the circuit by providing a low-impedance return path for unbalanced currents back to the supply.
During a continuity test with a multimeter, what indication confirms a good electrical connection?
A beep and near-zero resistance reading
No change in display
A reading above 1 MΩ
A high voltage reading
A continuity test beeps and shows a near-zero ohm reading when the path is conductive and has minimal resistance.
If 10 A flows through a cable with a total resistance of 0.2 Ω, what is the voltage drop across the cable?
5 V
0.5 V
20 V
2 V
Voltage drop is calculated by V = I Ã- R, so 10 A Ã- 0.2 Ω equals a 2 V drop.
Which common nonmetallic sheathed cable is often referred to by the brand name Romex?
THHN cable
MC cable
Armored BX cable
NM cable
NM stands for nonmetallic sheathed cable, and Romex is a well-known trade name for NM cable used in residential wiring.
What is the maximum allowable fill percentage for more than two conductors in a circular conduit by code?
80%
40%
30%
53%
The National Electrical Code limits conduit fill to 40% when more than two conductors occupy a raceway to allow for heat dissipation and ease of pulling.
A lamp connected to a switch won't light. Voltage is present at the switch but not at the fixture. What is the most likely cause?
Open neutral conductor
Tripped circuit breaker
Ground fault in fixture
Reversed polarity
If voltage reaches the switch but not the fixture, the neutral return path is likely open, preventing current flow through the lamp.
A single-phase 12 kVA load is supplied at 240 V. What size circuit breaker is needed to protect this load?
30 A
50 A
40 A
60 A
Current = Power / Voltage. 12 000 VA ÷ 240 V = 50 A, so a 50 A breaker is appropriate.
Designing a voltage divider: which resistor pair gives 5 V from a 12 V source if total current is irrelevant?
R1 = 3 kΩ and R2 = 9 kΩ
R1 = 7 kΩ and R2 = 5 kΩ
R1 = 5 kΩ and R2 = 7 kΩ
R1 = 6 kΩ and R2 = 6 kΩ
For Vout = 5 V from 12 V, the ratio R2/(R1+R2) = 5/12. R2 must be 5 parts and R1 7 parts, such as 5 kΩ and 7 kΩ respectively.
If a ground fault develops with fault impedance of 5 Ω at 120 V, what fault current flows?
24 A
25 A
6 A
120 A
Fault current is calculated by I = V / R. At 120 V divided by 5 Ω, the resulting current is 24 A.
In a 480 V three-phase wye system, what is the line-to-neutral voltage?
277 V
415 V
480 V
240 V
Line-to-neutral voltage in a wye system is line voltage divided by √3. 480 V / 1.732 ≈ 277 V.
A motor's locked-rotor current is typically five times its full-load current. If the full-load current is 20 A, what is the locked-rotor current?
40 A
100 A
60 A
20 A
Locked-rotor current is 5 Ã- full-load current. Multiplying 20 A by 5 gives 100 A during startup.
A busbar is rated at 400 A at 75 °C. If derating due to ambient conditions is 0.9, what is the new rating?
100 A
360 A
400 A
440 A
Derated current = nameplate rating Ã- derating factor. 400 A Ã- 0.9 = 360 A allowable under the new conditions.
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Learning Outcomes

  1. Analyse key electrical trade principles and standards.
  2. Identify common wiring methods and components.
  3. Apply safety protocols in electrical installations.
  4. Evaluate electrical circuits for troubleshooting efficiency.
  5. Demonstrate understanding of code compliance requirements.
  6. Master voltage calculations and circuit design basics.

Cheat Sheet

  1. Master the National Electrical Code (NEC) - Dive into the NEC like it's your favorite rulebook, because it truly is the foundation of safe electrical design, installation, and inspection. Get comfy with its structure and key articles to ensure compliance and keep sparks (and hazards) at bay!
  2. Explore Wiring Methods - From conduit to cable trays and raceways, each wiring method is like its own thrilling maze - learn where each fits best for top-notch safety and functionality. Once you know the installation requirements, you'll breeze through projects like a pro electrician.
  3. Know Your Electrical Components - Circuit breakers, fuses, and transformers are the superheroes that protect and manage electrical circuits - learn their secret identities! Understanding their roles and how they work together is key for troubleshooting and keeping everything powered up safely.
  4. Practice Safety Protocols - Grounding and bonding aren't just buzzwords; they're your best defense against shocks and fires. Always lockout/tagout before you dive into any electrical system to make sure you and your team stay injury-free.
  5. Evaluate Circuits Like a Detective - Arm yourself with a multimeter to measure voltage, current, and resistance - Ohm's Law (V = IR) is your trusty magnifying glass. Use these skills to diagnose hiccups in electrical issues and solve mysteries in no time.
  6. Stay Updated for Code Compliance - The NEC evolves, and so should you - keep up with the latest revisions and local amendments to stay one step ahead. Regularly reviewing code changes means your installations will always meet (or exceed!) current safety standards.
  7. Crunch Voltage Calculations - Practice series and parallel circuit problems to become a voltage wizard; remember, in series circuits voltage splits, while in parallel it stays steady across branches. Hone these calculation skills to light up your grades (and real-world projects).
  8. Design Circuits with Confidence - Load calculations and conductor sizing are your blueprint for circuits that run cool and efficient - no overheating drama here! Nail these basics to ensure every circuit can handle the intended load safely.
  9. Gear Up with PPE Essentials - Insulated gloves and arc flash suits aren't fashion statements - they're life-savers when you're working live. Choose the right protective equipment to keep every job site incident-free.
  10. Champion Energy Conservation & Renewables - Being energy-smart is the future of electrical work - learn techniques to save power and integrate renewables like solar or wind. Your knowledge of energy-efficient practices will power both your career and the planet forward.
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