Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 1. According to Ohm’s Law, if the voltage across a resistor is
doubled and the resistance remains constant, what happens to the
current?
A) It halves
B) It remains the same
C) It doubles
D) It quadruples
Answer: C
Explanation: Ohm’s Law states that I = V/R. If voltage (V) doubles and
resistance (R) stays the same, current (I) must also double.
Question 2. In a series circuit, what is true about the total resistance?
A) It is the sum of the individual resistances
B) It is less than the smallest resistance
C) It is the average of all resistances
D) It equals the resistance of the largest resistor only
Answer: A
Explanation: In a series circuit, total resistance is the sum of all
individual resistances, which increases circuit resistance proportionally.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 3. Which waveform characteristic distinguishes AC from DC?
A) AC has a constant magnitude
B) AC alternates direction periodically
C) DC has a sinusoidal waveform
D) DC voltage fluctuates sinusoidally
Answer: B
Explanation: Alternating current (AC) periodically reverses direction,
producing a sinusoidal waveform, whereas direct current (DC) flows in
one direction.
Question 4. What principle underlies the operation of a transformer?
A) Magnetism and electromagnetic induction
B) Resistance heating
C) Piezoelectric effect
D) Piezoelectricity and capacitance
Answer: A
Explanation: Transformers operate based on electromagnetic induction,
where changing magnetic flux induces voltage in a secondary coil.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 5. Which component in an AC circuit primarily opposes
changes in current?
A) Resistance
B) Inductance
C) Capacitance
D) Conductance
Answer: B
Explanation: Inductance opposes changes in current due to its property
of magnetic energy storage, causing reactance in AC circuits.
Question 6. What is the primary function of a GFCI device?
A) Protect against overload currents
B) Interrupt ground faults to prevent shock hazards
C) Provide surge protection
D) Detect arc faults in circuits
Answer: B
Explanation: GFCIs detect ground faults and quickly shut off power to
prevent electrical shock in wet or risky environments.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 7. When sizing a conductor, which factor does NOT influence
the ampacity?
A) Ambient temperature
B) Conductor insulation type
C) Length of the conductor
D) Number of conductors bundled together
Answer: C
Explanation: Length affects voltage drop, not ampacity directly.
Ampacity depends on temperature, insulation, and bundling, among
others.
Question 8. In a box fill calculation, which factor is NOT considered?
A) Number of conductors entering the box
B) Volume of devices installed
C) Length of conductors
D) Conductor insulation type
Answer: C
Explanation: Box fill calculations consider conductor count and device
volume, but not conductor length.
Supervising Electrician (S) Exam
Question 1. According to Ohm’s Law, if the voltage across a resistor is
doubled and the resistance remains constant, what happens to the
current?
A) It halves
B) It remains the same
C) It doubles
D) It quadruples
Answer: C
Explanation: Ohm’s Law states that I = V/R. If voltage (V) doubles and
resistance (R) stays the same, current (I) must also double.
Question 2. In a series circuit, what is true about the total resistance?
A) It is the sum of the individual resistances
B) It is less than the smallest resistance
C) It is the average of all resistances
D) It equals the resistance of the largest resistor only
Answer: A
Explanation: In a series circuit, total resistance is the sum of all
individual resistances, which increases circuit resistance proportionally.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 3. Which waveform characteristic distinguishes AC from DC?
A) AC has a constant magnitude
B) AC alternates direction periodically
C) DC has a sinusoidal waveform
D) DC voltage fluctuates sinusoidally
Answer: B
Explanation: Alternating current (AC) periodically reverses direction,
producing a sinusoidal waveform, whereas direct current (DC) flows in
one direction.
Question 4. What principle underlies the operation of a transformer?
A) Magnetism and electromagnetic induction
B) Resistance heating
C) Piezoelectric effect
D) Piezoelectricity and capacitance
Answer: A
Explanation: Transformers operate based on electromagnetic induction,
where changing magnetic flux induces voltage in a secondary coil.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 5. Which component in an AC circuit primarily opposes
changes in current?
A) Resistance
B) Inductance
C) Capacitance
D) Conductance
Answer: B
Explanation: Inductance opposes changes in current due to its property
of magnetic energy storage, causing reactance in AC circuits.
Question 6. What is the primary function of a GFCI device?
A) Protect against overload currents
B) Interrupt ground faults to prevent shock hazards
C) Provide surge protection
D) Detect arc faults in circuits
Answer: B
Explanation: GFCIs detect ground faults and quickly shut off power to
prevent electrical shock in wet or risky environments.
, Oregon (OR) Reciprocal General
Supervising Electrician (S) Exam
Question 7. When sizing a conductor, which factor does NOT influence
the ampacity?
A) Ambient temperature
B) Conductor insulation type
C) Length of the conductor
D) Number of conductors bundled together
Answer: C
Explanation: Length affects voltage drop, not ampacity directly.
Ampacity depends on temperature, insulation, and bundling, among
others.
Question 8. In a box fill calculation, which factor is NOT considered?
A) Number of conductors entering the box
B) Volume of devices installed
C) Length of conductors
D) Conductor insulation type
Answer: C
Explanation: Box fill calculations consider conductor count and device
volume, but not conductor length.
