___________________________________________________________________
Washington Skilled Trades &
Construction Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
Pdf
___________________________________________________________________
1. What agency administers electrician and plumber licensing and certification
programs in Washington?
A. Department of Licensing
B. Department of Labor & Industries
C. Department of Commerce
D. State Fire Marshal
Answer: Department of Labor & Industries
Rationale: Washington L&I administers Washington's electrical and plumbing
licensing and certification programs, including examinations and related
requirements.
2. What is the primary purpose of a construction contractor registration
requirement?
A. To establish building heights
B. To protect the public through regulatory requirements
C. To determine property taxes
D. To issue driver's licenses
,Answer: To protect the public through regulatory requirements
Rationale: Contractor registration helps establish accountability and requires
contractors to meet applicable bonding, insurance, and registration
requirements.
3. In Washington, a general electrical contractor is generally identified by
which classification?
A. 03
B. 06
C. 01
D. 09
Answer: 01
Rationale: Washington uses the 01 classification for general electrical
contractors and journey-level electricians.
4. What publication is the primary national reference for electrical installation
requirements?
A. IRC
B. NEC
C. UPC
D. IMC
Answer: NEC
Rationale: The National Electrical Code provides the fundamental electrical
installation requirements used by Washington with state amendments.
5. What is the main function of an electrical grounding system?
A. Increase voltage
B. Provide a path for fault current and help stabilize the electrical system
C. Reduce conductor size
D. Increase motor speed
,Answer: Provide a path for fault current and help stabilize the electrical system
Rationale: Grounding and bonding help provide effective fault-current paths and
reduce dangerous voltage differences.
6. Which device is designed to interrupt a circuit when excessive current
flows?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Junction box
Answer: Circuit breaker
Rationale: A circuit breaker opens the circuit when current exceeds its permitted
rating for a sufficient period.
7. What does GFCI stand for?
A. Ground-Fault Circuit Interrupter
B. Ground-Frequency Current Indicator
C. General Fault Control Installation
D. Grounded Fuse Circuit Isolator
Answer: Ground-Fault Circuit Interrupter
Rationale: A GFCI monitors current imbalance and disconnects power when it
detects a potentially hazardous ground-fault condition.
8. What is the purpose of electrical bonding?
A. To increase resistance
B. To connect conductive parts together to maintain electrical continuity
C. To reduce conductor length
D. To eliminate overcurrent protection
Answer: To connect conductive parts together to maintain electrical continuity
, Rationale: Bonding connects conductive parts so that a low-impedance fault-
current path is available when needed.
9. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: Ohm
Rationale: Resistance is measured in ohms and represents opposition to current
flow.
10.Which formula expresses Ohm's law?
A. P = I/R
B. V = I × R
C. R = V × I
D. I = V × R
Answer: V = I × R
Rationale: Ohm's law states that voltage equals current multiplied by
resistance.
11.What is the purpose of an electrical panelboard?
A. Store water
B. Distribute electrical power and provide overcurrent protection
C. Ventilate a building
D. Support roof framing
Answer: Distribute electrical power and provide overcurrent protection
Rationale: Panelboards distribute branch and feeder circuits and normally
contain overcurrent protective devices.
Washington Skilled Trades &
Construction Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
___________________________________________________________________
1. What agency administers electrician and plumber licensing and certification
programs in Washington?
A. Department of Licensing
B. Department of Labor & Industries
C. Department of Commerce
D. State Fire Marshal
Answer: Department of Labor & Industries
Rationale: Washington L&I administers Washington's electrical and plumbing
licensing and certification programs, including examinations and related
requirements.
2. What is the primary purpose of a construction contractor registration
requirement?
A. To establish building heights
B. To protect the public through regulatory requirements
C. To determine property taxes
D. To issue driver's licenses
,Answer: To protect the public through regulatory requirements
Rationale: Contractor registration helps establish accountability and requires
contractors to meet applicable bonding, insurance, and registration
requirements.
3. In Washington, a general electrical contractor is generally identified by
which classification?
A. 03
B. 06
C. 01
D. 09
Answer: 01
Rationale: Washington uses the 01 classification for general electrical
contractors and journey-level electricians.
4. What publication is the primary national reference for electrical installation
requirements?
A. IRC
B. NEC
C. UPC
D. IMC
Answer: NEC
Rationale: The National Electrical Code provides the fundamental electrical
installation requirements used by Washington with state amendments.
5. What is the main function of an electrical grounding system?
A. Increase voltage
B. Provide a path for fault current and help stabilize the electrical system
C. Reduce conductor size
D. Increase motor speed
,Answer: Provide a path for fault current and help stabilize the electrical system
Rationale: Grounding and bonding help provide effective fault-current paths and
reduce dangerous voltage differences.
6. Which device is designed to interrupt a circuit when excessive current
flows?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Junction box
Answer: Circuit breaker
Rationale: A circuit breaker opens the circuit when current exceeds its permitted
rating for a sufficient period.
7. What does GFCI stand for?
A. Ground-Fault Circuit Interrupter
B. Ground-Frequency Current Indicator
C. General Fault Control Installation
D. Grounded Fuse Circuit Isolator
Answer: Ground-Fault Circuit Interrupter
Rationale: A GFCI monitors current imbalance and disconnects power when it
detects a potentially hazardous ground-fault condition.
8. What is the purpose of electrical bonding?
A. To increase resistance
B. To connect conductive parts together to maintain electrical continuity
C. To reduce conductor length
D. To eliminate overcurrent protection
Answer: To connect conductive parts together to maintain electrical continuity
, Rationale: Bonding connects conductive parts so that a low-impedance fault-
current path is available when needed.
9. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: Ohm
Rationale: Resistance is measured in ohms and represents opposition to current
flow.
10.Which formula expresses Ohm's law?
A. P = I/R
B. V = I × R
C. R = V × I
D. I = V × R
Answer: V = I × R
Rationale: Ohm's law states that voltage equals current multiplied by
resistance.
11.What is the purpose of an electrical panelboard?
A. Store water
B. Distribute electrical power and provide overcurrent protection
C. Ventilate a building
D. Support roof framing
Answer: Distribute electrical power and provide overcurrent protection
Rationale: Panelboards distribute branch and feeder circuits and normally
contain overcurrent protective devices.
