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Question 1. What does Ohm’s Law state for a purely resistive circuit? A) V = I × R B) V = I / R C) I = V × R D) R = V + I Answer: A Explanation: Ohm’s Law defines voltage as the product of current and resistance (V = I·R) for resistive elements. Question 2. In a three-phase Wye system, the line-to-neutral voltage is ______ the line-to-line voltage? A) equal to B) √2 times larger than C) √3 times smaller than D) √3 times larger than Answer: C Explanation: V_line-to-neutral = V_line-to-line / √3, so it is √3 times smaller. Question 3. Which component is used to correct a lagging power factor caused by inductive loads? A) Inductor B) Capacitor bank C) Resistor D) Transformer Answer: B Explanation: Capacitors provide leading reactive power, offsetting the lagging reactive power of inductive loads. Question 4. According to OSHA 1910.269, what is the minimum approach distance (MAD) for a 15 kV uninsulated energized line when using a hot stick? A) 3 ft
B) 4 ft C) 5 ft D) 6 ft Answer: B Explanation: The OSHA table sets a 4-ft MAD for 15 kV when using hot-stick tools. Question 5. When performing a lockout/tagout (LOTO) on a pole-mounted transformer, which of the following must be documented? A) Only the lock number B) The name of the person applying the lock, the equipment isolated, and the lock’s unique identifier C) The voltage rating of the transformer D) The weather conditions at the time of lockout Answer: B Explanation: LOTO requires identification of the authorized employee, the equipment, and a unique lock/tag ID. Question 6. Which PPE item provides the highest protection against arc flash exposure? A) Arc-rated (FR) coat, class 4 B) Rubber insulated gloves, 30 kV rating C) Hard hat with chin strap D) Safety glasses with side shields Answer: A Explanation: Arc-rated clothing is rated by incident energy; class 4 provides the highest protection among the listed options. Question 7. In a confined space entry, which atmospheric condition is the most critical to monitor? A) Temperature above 120 °F B) Oxygen level below 19.5% or above 23.5% C) Relative humidity above 80%
Explanation: Suspension disc (or string) insulators support the conductor and are common on high-voltage lines. Question 11. A pole is classified as “Class 1” according to ANSI standards. What does this indicate? A) The pole can support up to 5 kV B) The pole is made of concrete C) The pole is suitable for low-voltage distribution (≤ 2.4 kV) D) The pole can be used for transmission (≥ 69 kV) Answer: C Explanation: Class 1 poles are intended for low-voltage distribution up to 2.4 kV. Question 12. When installing a dead-end pole, what is the recommended minimum embedment depth for a 40-ft wooden pole in sandy soil? A) 1 ft B) 2 ft C) 3 ft D) 4 ft Answer: C Explanation: For sandy soil, a 40-ft pole generally requires at least a 3-ft embedment to achieve adequate holding strength. Question 13. Which of the following best describes a “lead-to-height” ratio for guy wires? A) Ratio of conductor tension to pole height B) Ratio of the horizontal distance from pole to anchor (lead) to the vertical height of the anchor point (height) C) Ratio of soil bearing capacity to pole load D) Ratio of insulator length to pole diameter Answer: B Explanation: Lead-to-height is the horizontal distance (lead) divided by the vertical height of the guy attachment point.
Question 14. During live-line work, what is the purpose of a “rubber glove” technique? A) To provide insulation for the worker while handling energized parts B) To increase the worker’s grip on metal tools C) To protect the worker from chemical exposure D) To reduce heat buildup on the hands Answer: A Explanation: Rubber gloves are insulated to prevent current flow through the worker’s body when handling live equipment. Question 15. Which type of transformer connection results in a line voltage that is √3 times the phase voltage? A) Wye-Wye B) Delta-Wye C) Delta-Delta D) Open-Delta Answer: C Explanation: In a Delta-Delta connection, line voltage equals phase voltage; however, the question asks for line voltage √3 times phase voltage, which occurs in a Wye-Wye. The correct answer is A. Answer: A Explanation: In a Wye-Wye system, line voltage = √ 3 × phase voltage. Question 16. What does the “additive polarity” marking on a transformer indicate? A) The secondary winding is wound opposite to the primary B) The secondary voltage adds to the primary when connected in series C) The transformer can only be used for step-up applications D) The transformer must be grounded at the neutral point Answer: B
Question 20. When pulling a conduit string through a duct bank, the maximum pulling tension should not exceed what percentage of the conduit’s rated breaking strength? A) 25 % B) 40 % C) 50 % D) 75 % Answer: B Explanation: Industry practice limits pull tension to 40 % of the conduit’s breaking strength to avoid damage. Question 21. What is the primary function of a “cold-shrink” termination on a medium-voltage cable? A) To provide a high-temperature seal B) To expand under heat and seal the cable after cooling C) To create a hermetic seal without applying heat, using a resilient elastomer that contracts when released D) To serve as a mechanical splice only, not a seal Answer: C Explanation: Cold-shrink terminations use a pre-stressed elastomer that shrinks to seal the cable when the outer sleeve is released. Question 22. Which of the following ground-ing components is commonly called a “duck” in utility practice? A) A ground rod with a U-shaped bend B) A copper-clad steel plate used to improve soil contact C) A flexible grounding strap with a looped end D) A pressure-treated wooden post used as a ground electrode Answer: B Explanation: “Duck” refers to a copper-clad steel grounding plate that provides a large surface area for earth contact.
Question 23. In an equipotential zone (EPZ) on a live-line work platform, what is the main safety benefit? A) Reduces the need for personal protective equipment B) Eliminates all electric fields in the area C) Keeps all conductive parts at the same potential, preventing step and touch voltages D) Allows workers to touch the energized conductor safely Answer: C Explanation: EPZ equalizes potential across the work area, minimizing hazardous step and touch voltages. Question 24. What is the typical voltage rating for a service drop meter socket used on a residential 120/240 V service? A) 120 V B) 240 V C) 480 V D) 600 V Answer: B Explanation: Residential service drops are 240 V line-to-line; the meter socket must be rated for at least that voltage. Question 25. Which of the following is a common indicator of power diversion (tampering) on a utility pole? A) A missing street light B) An unusually high current reading on a residential meter C) A broken transformer oil tank D) A rusted pole base Answer: B Explanation: Anomalously high consumption suggests illegal tapping or meter tampering.
C) 400 Hz D) 25 Hz Answer: B Explanation: The North American grid operates at 60 Hz. Question 30. Which of the following best describes the “skin effect” in AC conductors? A) Current flows uniformly across the cross-section at all frequencies B) Higher frequency currents concentrate near the surface, reducing effective conductor area C) The conductor skin becomes hotter than the core D) It only occurs in DC circuits Answer: B Explanation: At higher frequencies, current density is higher near the surface, reducing effective cross-section. Question 31. When a line conductor is subjected to a short-circuit fault, which protective device typically operates first? A) Recloser B) Fuse C) Circuit breaker D) Surge arrester Answer: C Explanation: Circuit breakers detect overcurrent quickly and trip to clear the fault before fuses melt (which may be slower) and reclosers act after the breaker. Question 32. A utility worker must climb a 45-ft pole with a safety harness. According to OSHA, what is the minimum required fall arrest distance? A) 3 ft B) 5 ft C) 7 ft D) 10 ft
Answer: C Explanation: OSHA mandates at least a 7-ft deceleration distance for a full-body harness system. Question 33. Which of the following is the correct sequence for a proper LOTO procedure? A) Notify, isolate, lock, verify, tag, restore B) Isolate, notify, lock, verify, tag, restore C) Notify, isolate, lock, verify, tag, restore D) Isolate, lock, notify, verify, restore, tag Answer: C Explanation: The standard steps are: notify affected employees, isolate energy, apply lock(s), verify isolation, tag, then restore after removal. Question 34. What is the purpose of a “safety grounding conductor” in a residential service panel? A) To carry normal load current B) To provide a low-impedance path for fault current back to the source C) To balance the three phases D) To reduce voltage drop on the hot conductors Answer: B Explanation: The grounding conductor safely carries fault currents, limiting voltage rise during a fault. Question 35. During a bucket-truck rescue, which of the following is the most important first step? A) Lower the bucket to the ground B) Secure the patient with a stretcher C) Establish a stable platform and ensure the bucket is locked in the “up” position D) Call for additional medical assistance Answer: C
Question 39. What is the typical resistance value of a standard 250 kV grounding resistor used in a neutral grounding system? A) 5 Ω B) 25 Ω C) 100 Ω D) 400 Ω Answer: C Explanation: A 250 kV system often uses a 100 Ω resistor to limit fault current while providing effective grounding. Question 40. Which of the following is a primary cause of “corona discharge” on high-voltage transmission lines? A) Low ambient temperature B) High surface electric field exceeding the air breakdown strength C) Excessive conductor sag D) Use of aluminum conductors instead of copper Answer: B Explanation: Corona occurs when the electric field at the conductor surface exceeds the dielectric strength of air, ionizing it. Question 41. In a dead-end structure, why is a dead-end brace installed on the pole? A) To support the conductor tension and prevent pole rotation B) To provide a mounting point for street lights C) To increase the pole’s visual appeal D) To house the ground wire Answer: A Explanation: A dead-end brace resists the horizontal pull of the conductor, keeping the pole from rotating. Question 42. Which testing instrument is used to verify the insulation resistance of a high-voltage cable?
A) Clamp-on ammeter B) Megohmmeter (insulation tester) C) Multimeter set to ohms D) Voltage regulator Answer: B Explanation: A megohmmeter applies a high DC voltage and measures the resulting resistance, indicating insulation quality. Question 43. When calculating the voltage drop on a 3-phase feeder delivering 200 A over 500 ft of 4/0 AWG copper conductors, which factor is most significant? A) Conductor temperature rating B) Power factor of the load C) Number of phases D) Conductor resistance per 1000 ft Answer: D Explanation: Voltage drop is directly proportional to conductor resistance; the per- 1000 - ft resistance of 4/0 AWG is the key variable. Question 44. Which of the following is the correct order of phases for a standard U.S. three-phase system? A) A-B-C (positive sequence) B) A-C-B (negative sequence) C) B-A-C D) C-B-A Answer: A Explanation: The standard positive sequence is A, B, C (120° apart). Question 45. What is the primary function of a “surge arrester” on a transmission line? A) To limit over-current during a short circuit B) To divert excessive voltage transients to ground
Answer: B Explanation: The primary side of the transformer matches the distribution voltage, 13.8 kV. Question 49. When using a mechanical rigging sling, the Working Load Limit (WLL) is determined by: A) The sling’s length B) The material type and construction factor of safety (typically 5:1) C) The color of the sling D) The ambient temperature only Answer: B Explanation: WLL = Rated Load / Safety Factor; manufacturers specify WLL based on material strength and a standard safety factor. Question 50. Which type of pole-mounted device is used to detect and clear ground faults on a distribution line? A) Recloser B) Fault-current limiter (FCL) C) Ground fault detector (GFD) with a trip coil D) Capacitor bank Answer: C Explanation: A ground fault detector senses fault current to ground and initiates a trip. Question 51. In a Wye-Delta transformer bank, what is the phase shift between primary and secondary line voltages? A) 0° B) 30° leading C) 30° lagging D) 60° leading Answer: B
Explanation: Wye-Delta connections introduce a 30° leading phase shift from primary to secondary. Question 52. When performing a “thumping” test on a buried cable, the operator listens for a change in tone. What does a higher-pitched tone generally indicate? A) The cable is intact B) The fault is located near the thump point C) The cable has excess moisture D) The conductor size is larger than expected Answer: B Explanation: A change to a higher pitch often signifies the acoustic wave encountering a fault, indicating proximity. Question 53. Which OSHA standard specifically addresses safety for electric power generation, transmission, and distribution? A) 29 CFR 1910. B) 29 CFR 1910. C) 29 CFR 1926. D) 29 CFR 1910. Answer: B Explanation: OSHA 1910.269 covers safety for electric power generation, transmission, and distribution. Question 54. What is the primary purpose of a “dead-end clamp” on a conductor string? A) To join two conductors together in a splice B) To secure the conductor to a pole at the termination point, resisting tension C) To provide a grounding path for the conductor D) To serve as a marker for line identification Answer: B Explanation: Dead-end clamps anchor the conductor at the termination, handling the full tension of the line.
A) 120 V
B) 277 V
C) 480 V
D) 13.8 kV Answer: B Explanation: Street-lighting systems often operate at 277 V (line-to-neutral) supplied by a Class III transformer. Question 59. Which tool is specifically designed to safely cut live energized conductors without direct contact? A) Cable cutter with insulated handles B) Hot-stick insulated cutter C) Hydraulic bolt cutter D) Conventional bolt-cutting pliers Answer: B Explanation: A hot-stick cutter is an insulated, pole-mounted device allowing safe cutting of live conductors. Question 60. When a utility worker uses a “rubber mitt” while gloving, what is the primary benefit? A) Improves grip on tools B) Provides a secondary barrier against arc-flash exposure C) Reduces hand fatigue from weight D) Increases thermal conductivity for better heat dissipation Answer: B Explanation: Rubber mitts add an extra insulating layer, reducing the chance of arc-flash injury. Question 61. What is the primary effect of “skin effect” on the resistance of a conductor at 60 Hz compared to DC? A) Resistance decreases significantly B) Resistance remains unchanged
C) Resistance increases slightly due to reduced effective cross-section D) Resistance becomes zero Answer: C Explanation: At 60 Hz, the current concentrates near the surface, effectively reducing cross-section and slightly raising resistance. Question 62. Which of the following is a correct description of a “dead-end” pole in a distribution line? A) A pole that only supports a single phase conductor B) A pole where the line terminates and must resist the full horizontal tension of the conductors C) A pole equipped with a transformer for voltage step-down D) A pole used exclusively for street lighting fixtures Answer: B Explanation: Dead-end poles anchor the line and must handle the entire horizontal pull of the conductors. Question 63. In a three-phase delta system, what is the relationship between line and phase voltage? A) Line voltage = Phase voltage B) Line voltage = √2 × Phase voltage C) Line voltage = √3 × Phase voltage D) Line voltage = 2 × Phase voltage Answer: A Explanation: In a delta connection, line voltage equals phase voltage. Question 64. When measuring the continuity of a transformer winding with a multimeter, which reading indicates an open circuit? A) 0 Ω B) 1 Ω C) 10 Ω D) Infinite (or “OL”)
