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Question 1. Which OSHA subpart specifically addresses safety requirements for electric power transmission and distribution work? A) Subpart D – Walking-Working Surfaces B) Subpart V – Electric Power Transmission and Distribution C) Subpart J – General Industry D) Subpart L – Personal Protective Equipment Answer: B Explanation: OSHA 1926 Subpart V is dedicated to regulations governing electric power transmission and distribution activities, covering hazards such as electrical shock, arc flash, and equipment safety. Question 2. The National Electrical Safety Code (NESC) primarily governs which of the following? A) Installation of residential wiring B) Safety standards for utility transmission and distribution systems C) Fire alarm system design D) Low-voltage communication cabling Answer: B Explanation: NESC sets safety and performance standards for utility transmission and distribution facilities, including grounding, clearances, and equipment specifications. Question 3. Minimum Approach Distance (MAD) for a 15 kV line is required to be at least: A) 3 ft B) 6 ft C) 9 ft D) 12 ft Answer: B
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Explanation: According to NESC Table 3, the MAD for a 15 kV line is 6 ft, ensuring safe working clearances to prevent accidental contact. Question 4. Which PPE item is mandatory when working on live parts above 600 V? A) Hard hat only B) Insulating rubber gloves rated for the voltage level C) Safety glasses D) Steel-toed boots Answer: B Explanation: Insulating rubber gloves rated for the specific voltage provide protection against electrical shock when handling live parts above 600 V. Question 5. The arc flash thermal performance value (ATPV) of a clothing ensemble is measured in: A) Joules per square centimeter (J/cm²) B) Watts per square meter (W/m²) C) Newtons per square meter (N/m²) D) Volts per meter (V/m) Answer: A Explanation: ATPV quantifies the amount of thermal energy a garment can absorb before the wearer receives a second-degree burn, expressed in J/cm². Question 6. When selecting a pole class for a 69 kV distribution line, which class is typically appropriate? A) Class 1 B) Class 3 C) Class 5 D) Class 8
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D) Facilitate future line re-configuration Answer: B Explanation: A dead-end brace resists lateral forces at the line’s endpoint, preventing movement of the pole and maintaining alignment. Question 10. Which conductor type combines aluminum’s conductivity with steel’s strength? A) AAC (All-Aluminum Conductor) B) ACSR (Aluminum Conductor Steel Reinforced) C) Copper-Aluminum Composite D) X-Cable Answer: B Explanation: ACSR incorporates a steel core for tensile strength while the outer aluminum strands provide high conductivity. Question 11. When using a sag chart for a 500 ft span of ACSR conductor, a temperature increase of 30 °F will cause the sag to: A) Decrease proportionally B) Remain unchanged C) Increase proportionally D) Reverse direction Answer: C Explanation: Higher temperatures cause conductors to expand, increasing sag; sag charts quantify this relationship. Question 12. According to NESC Section 23, the minimum vertical clearance for a 33 kV line over a public roadway is: A) 12 ft B) 18 ft
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C) 22 ft D) 28 ft Answer: C Explanation: NESC mandates a minimum vertical clearance of 22 ft for 33 kV lines over public roads to ensure vehicle safety. Question 13. The lead-to-height ratio for a down-guy on a pole is typically: A) 1: B) 1: C) 1: D) 1: Answer: C Explanation: A 1:3 ratio (lead length to pole height) provides adequate stabilization while maintaining reasonable installation space. Question 14. Which anchor type is most suitable for rocky soil when installing a guy system? A) Screw anchor B) Plate anchor C) Rock anchor with epoxy grout D) Concrete-encased anchor Answer: C Explanation: Rock anchors with epoxy grout are designed to bond securely in hard, rocky substrates where other anchors cannot achieve proper embedment. Question 15. For a high-voltage direct-buried cable, the minimum burial depth over a public right-of-way is: A) 12 inches B) 18 inches
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A) 1 kN B) 2 kN C) 3 kN D) 4 kN Answer: B Explanation: Pulling tension limits are specified by the cable manufacturer; for 500 kcmil copper, the typical maximum is around 2 kN to avoid conductor damage. Question 19. In an overhead transformer installation, the primary winding is typically connected to: A) The secondary distribution circuit B) The utility supply voltage C) A grounding electrode D) A load-side protective relay Answer: B Explanation: The primary winding receives the high-voltage supply from the utility, while the secondary provides the lower distribution voltage. Question 20. Pad-mounted transformers must be equipped with a lockable enclosure primarily to: A) Prevent theft of metal components B) Ensure only authorized personnel can access high-voltage connections C) Reduce noise emissions D) Facilitate cooling airflow Answer: B Explanation: Lockable enclosures protect against accidental contact with live parts and restrict access to qualified staff. Question 21. A tap changer on a distribution transformer is used to:
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A) Adjust voltage output to maintain line regulation under varying loads B) Change the transformer’s frequency rating C) Provide over-current protection D) Switch the transformer between primary and secondary circuits Answer: A Explanation: Tap changers modify the turns ratio, allowing fine adjustments of the secondary voltage to compensate for load variations. Question 22. Selecting a fuse for transformer protection, the fuse rating should be set at approximately:** A) 50 % of the transformer’s full-load current B) 75 % of the transformer’s full-load current C) 125 % of the transformer’s full-load current D) 150 % of the transformer’s full-load current Answer: C Explanation: A fuse rating of about 125 % of full-load current provides protection while avoiding nuisance blowing during normal operation. Question 23. Reclosers differ from sectionalizers in that reclosers: A) Operate automatically to restore service after a transient fault B) Require manual operation for each fault clearing C) Only isolate a faulted section without reclosing D) Provide voltage regulation functions Answer: A Explanation: Reclosers automatically attempt to re-energize a line after a temporary fault, whereas sectionalizers only isolate a faulted segment. Question 24. The primary function of a lightning arrestor on a distribution line is to:
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A) Normal load operation B) A ground-fault on a high-voltage line C) Routine maintenance with de-energized equipment D) Switching operations on a transformer Answer: B Explanation: A ground-fault creates a voltage gradient in the soil, causing dangerous step potentials for personnel walking nearby. Question 28. Temporary grounding for line maintenance is intended to create an Equipotential Zone (EPZ) that: A) Increases line voltage for testing B) Equalizes potential between the line and the ground to protect workers C) Isolates the line from all ground currents D) Allows for higher fault currents during maintenance Answer: B Explanation: An EPZ ensures that any exposed conductive parts are at the same potential as the earth, minimizing shock risk. Question 29. Ohm’s Law states that V = I × R. If a 120 V circuit draws 10 A, the resistance is: A) 6 Ω B) 12 Ω C) 120 Ω D) 1.2 Ω Answer: A Explanation: R = V / I = 120 V / 10 A = 12 Ω (Correction: The correct calculation yields 12 Ω, not 6 Ω. The answer should be B). Question 30. In a three-phase wye system, the line-to-ground voltage is:
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A) Equal to the phase voltage B) √3 times the phase voltage C) 1/√3 times the phase voltage D) Twice the phase voltage Answer: A Explanation: In a wye configuration, line-to-ground voltage equals the phase voltage. Question 31. For a three-phase delta system, the line-to-line voltage is: A) Equal to the phase voltage B) √3 times the phase voltage C) 1/√3 times the phase voltage D) Twice the phase voltage Answer: B Explanation: In delta, line voltage = √3 × phase voltage due to the 120° phase displacement. Question 32. The full-load current of a 500 kVA, 13.8 kV transformer (three-phase) is approximately:** A) 20 A B) 21 A C) 20.9 A D) 23 A Answer: C Explanation: Full-load current I = (KVA × 1000) / (√ 3 × V) = 500,000 / (1.732 × 13,800) ≈ 20.9 A. Question 33. Ice loading on a pole is typically calculated using a uniform ice thickness of:
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A) Attach insulators, then mount the crossarm, then secure hardware B) Install the crossarm, then attach hardware, then mount insulators C) Mount hardware, install crossarm, then attach insulators D) Install insulators, then hardware, then crossarm Answer: B Explanation: The crossarm is first bolted to the pole using hardware; insulators are then mounted on the crossarm. Question 37. Which type of conduit is most resistant to chemical corrosion for underground high-voltage cables? A) Rigid steel conduit B) PVC conduit C) Fiberglass reinforced conduit (FRC) D) Aluminum conduit Answer: C Explanation: Fiberglass reinforced conduit offers superior chemical resistance compared to metal or PVC options. Question 38. A “dead-end” in a transmission line refers to: A) The point where the line connects to a substation B) A line termination without a continuation on the opposite side of the pole C) The midpoint of a line span D) A section of line with no load Answer: B Explanation: A dead-end is a line termination where the conductor ends on a pole without extending beyond, requiring specific hardware for stability. Question 39. The purpose of a “head guy” on a pole is to:
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A) Support the pole’s top section against overturning forces B) Provide a path for grounding conductors C) Secure the crossarm to the pole D) Anchor the pole in the ground Answer: A Explanation: Head guys are tensioned cables attached near the top of a pole to counteract uplift and lateral forces. Question 40. In a conduit system, the “pulling tension” limit for a 2-inch PVC conduit is generally: A) 5 kN B) 10 kN C) 15 kN D) 20 kN Answer: B Explanation: Manufacturer specifications often set a maximum pulling tension of about 10 kN for 2-inch PVC conduit to avoid deformation. Question 41. When installing a grounding electrode system for a pad-mounted transformer, the recommended spacing between ground rods is: A) 2 ft B) 4 ft C) 6 ft D) 8 ft Answer: C Explanation: Spacing ground rods 6 ft apart helps achieve a lower overall earth resistance by increasing the effective contact area. Question 42. A “stress cone” is typically made from which material?
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A) The mats are placed directly under the fault location B) The mats are installed at the service entrance only C) The mats are spaced uniformly every 10 ft along the line D) The mats are used only on metal-clad cables Answer: A Explanation: Grounding mats placed beneath the fault location lower the voltage gradient in the soil, reducing step-potential hazards for personnel. Question 46. Which of the following is a correct statement about “arc flash boundary” (AFB)? A) It is the distance at which the incident energy is 1.2 cal/cm² B) It is the distance at which a worker could receive a second-degree burn without PPE C) It is the distance at which the flashover voltage equals the system voltage D) It is the distance where the incident energy is 8 cal/cm², the threshold for a second-degree burn with standard PPE Answer: D Explanation: The AFB is defined as the distance where the incident energy reaches 8 cal/cm², the level at which a worker could sustain a second-degree burn despite wearing standard arc-flash PPE. Question 47. For a 13.2 kV distribution line, the recommended minimum horizontal clearance from a roadway is: A) 10 ft B) 15 ft C) 20 ft D) 25 ft Answer: C Explanation: NESC specifies a minimum horizontal clearance of 20 ft for 13.2 kV lines over roadways to ensure safety.
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Question 48. The “tap changer” on a transformer is classified as: A) On-load tap changer (OLTC) if it can operate without de-energizing the transformer B) Off-load tap changer (OFTC) if it can operate while the transformer is energized C) Both A and B simultaneously D) Neither A nor B; tap changers are only manual devices Answer: A Explanation: An on-load tap changer can adjust voltage while the transformer remains energized, unlike an off-load tap changer which requires de-energization. Question 49. The standard color coding for a grounding conductor in a three-phase system is: A) Black B) Red C) White D) Green or bare copper Answer: D Explanation: Grounding conductors are identified by green insulation or bare copper per NEC and NESC standards. Question 50. When performing a pull test on a newly installed underground cable, the acceptable maximum tension is typically: A) 75 % of the cable’s rated tensile strength B) 50 % of the cable’s rated tensile strength C) 100 % of the cable’s rated tensile strength D) 125 % of the cable’s rated tensile strength Answer: B
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Answer: B Explanation: Ground-fault protection monitors zero-sequence (ground) current to detect and isolate faults on the line. Question 54. When installing a “dead-end” insulator string, the final component is typically a: A) Suspension clamp B) Strain insulator C) Grounding strap D) Weatherhead Answer: B Explanation: A strain insulator is used at the end of a dead-end string to handle the mechanical tension of the conductor. Question 55. The primary reason for using a “copper-aluminum composite conductor” is: A) To reduce sag compared to pure copper B) To combine the conductivity of copper with the lower cost of aluminum C) To increase thermal resistance D) To simplify installation procedures Answer: B Explanation: Composite conductors aim to achieve a balance between copper’s conductivity and aluminum’s lower cost and weight. Question 56. A “rock anchor” installed in a granite formation typically requires which of the following for proper load transfer? A) Concrete grout only B) Mechanical expansion bolts only C) Epoxy-based adhesive in combination with mechanical means
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D) No additional material; rock anchors are self-anchoring Answer: C Explanation: Epoxy adhesives improve bond strength in hard rock, complementing the mechanical anchoring action. Question 57. The “ground-potential rise” (GPR) during a fault is primarily a concern for: A) Low-voltage residential circuits only B) High-voltage transmission lines where large fault currents can elevate earth potential C) Isolated grounding systems D) Systems with no grounding electrode Answer: B Explanation: GPR occurs when large fault currents flow into the earth, raising the local ground potential and posing a shock hazard. Question 58. Which of the following is NOT a typical component of a “manhole” for underground distribution? A) Ladders or steps B) Drainage sumps C) Ventilation grates D) High-voltage capacitor bank Answer: D Explanation: Manholes provide access, drainage, and ventilation; high-voltage capacitor banks are not standard components. Question 59. When calculating the “ampacity” of a conductor, the primary factor that reduces the allowable current is: A) Conductor length
