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100+ Free NV A-17 Transmission Lines Practice Questions

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2026 Statistics

Key Facts: NV A-17 Transmission Lines Exam

40 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Closed Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada A-17 Lines to Transmit Electricity Contractor Examination is the official NSCB/PSI closed book exam: 40 questions, 70% (28 of 40 points), 1.5 hours, USD 95 (bulletin 291, updated 3/25/2026). Official delivery: English.

Sample NV A-17 Transmission Lines Practice Questions

Try these sample questions to test your NV A-17 Transmission Lines exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1The kVA rating on a primary overhead distribution transformer nameplate is a rating of:
A.Apparent power the windings can carry continuously at the nameplate voltage and temperature rise
B.Real power in kilowatts that the transformer can deliver only at unity power factor
C.The utility's peak system load in megawatts
D.The interrupting rating of the primary fuse
Explanation: Transformer capacity is stated in kilovolt-amperes because winding heating depends on current, not on the load power factor. A 25 kVA tank can deliver 25 kVA continuously at rated voltage and rise whether the load is mostly watts or a mix of watts and vars. Lineman's Handbook practice treats that nameplate kVA as the thermal limit used to size fusing and loading.
2A single-phase pole-mount transformer is rated 7,200 V primary and 240 V secondary. What is the turns ratio of the windings?
A.10:1
B.24:1
C.30:1
D.240:1
Explanation: Turns ratio equals voltage ratio: Np/Ns = Vp/Vs. 7,200 divided by 240 is 30, so the primary has 30 times as many turns as the secondary. Crews use the same ratio to predict primary current from a known secondary load before energizing.
3A 25 kVA single-phase pole-mount transformer is fully loaded on a 240 V secondary. What is the approximate full-load secondary current?
A.10 A
B.52 A
C.104 A
D.208 A
Explanation: Single-phase current is I = S / V. Convert 25 kVA to 25,000 VA and divide by 240 V: 25,000 / 240 = 104 A. Line workers use this check when sizing secondary leads, connectors, and expected loading on a primary overhead transformer.
4A single-phase 50 kVA transformer has a 7,200 V primary. What is the approximate full-load primary current?
A.3.5 A
B.208 A
C.14 A
D.6.9 A
Explanation: I = S / V = 50,000 / 7,200 ≈ 6.9 A. Crews use that figure when selecting the primary fuse and when checking whether a cutout or current-limiting fuse is in the right range for the tank.
5A no-load tap changer on a primary overhead distribution transformer is intended to be operated:
A.While the transformer is energized and carrying full load
B.As a substitute for a line voltage regulator under varying daily load
C.Only after the transformer is deenergized, to select a different primary voltage tap
D.To reverse polarity so two tanks can be paralleled
Explanation: Distribution no-load taps change the primary turns to match the feeder voltage (for example 7,200 V versus 7,620 V). The handle is interlocked for deenergized operation. Live tap changing requires a load-tap changer, which ordinary pole-mount units do not have.
6What is the defining feature of a completely self-protected (CSP) overhead distribution transformer?
A.It has only a secondary winding and no primary winding
B.It must be fused exclusively with a station-class circuit breaker
C.It can be installed only on a concrete pad at grade
D.It includes internal overcurrent protection and typically a tank-mounted arrester so a separately mounted primary cutout is not required
Explanation: A CSP transformer carries its own primary protective link, usually a secondary breaker, and a lightning arrester on or in the tank. That package replaces the external fused cutout and separately mounted arrester used with a conventional unit, which is why CSP units are common on simple primary overhead services.
7Before paralleling two single-phase distribution transformers on the same secondary, a line crew must verify that the units have matching:
A.Paint color and manufacturer only
B.Primary fuse sizes only
C.Voltage ratings, polarity, and compatible percent impedance
D.Oil types, even if the voltage ratings differ
Explanation: Paralleled transformers share load only if they have the same voltage ratio and polarity and similar impedance. A polarity or tap mismatch circulates current between tanks; a large impedance mismatch dumps most of the load onto the lower-impedance unit.
8On a conventional (non-CSP) pole-mount transformer, the primary fused cutout is installed mainly to:
A.Protect the transformer and isolate a failed unit from the primary feeder
B.Regulate secondary voltage under load
C.Serve as the customer's main service disconnect
D.Bond the tank to the multi-grounded neutral
Explanation: A conventional transformer has no internal primary fuse, so an external expulsion cutout is hung on the pole. The fuse is coordinated with transformer kVA and primary voltage so a winding fault or severe overload blows the fuse and drops the tank off the feeder.
9Why is a wye-connected secondary preferred on a multi-grounded four-wire primary distribution system?
A.A wye connection provides a common neutral point that can be grounded and used for single-phase loads
B.A wye secondary has no neutral, which eliminates ground-fault current
C.A wye secondary can be used only with delta primaries and never with wye primaries
D.Wye secondaries block all lightning surge current
Explanation: In a wye, the three windings meet at a neutral. That point is grounded and carried out as the system neutral so single-phase transformers and services can be connected phase-to-neutral. A delta secondary has no inherent neutral and is a three-wire system unless a grounding transformer is added.
10Three 25 kVA single-phase transformers are banked wye-wye to serve a 480Y/277 V three-phase load. What is the approximate full-load secondary line current of the bank?
A.30 A
B.52 A
C.90 A
D.156 A
Explanation: Bank capacity is 3 × 25 kVA = 75 kVA. Three-phase current is I = S / (V × √3) = 75,000 / (480 × 1.732) ≈ 90 A. Each tank still sees its own 25 kVA, but the line conductors carry about 90 A.

About the NV A-17 Transmission Lines Exam

The Nevada A-17 Lines to Transmit Electricity Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 40 scored questions. Passing is 70% (28 of 40 points) in 1.5 hours. The examination is closed book. PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Closed Book computer-based multiple-choice. See the current PSI Nevada contractor bulletin for allowed and closed-book references.

Time Limit

1.5 hours

Passing Score

70% (28 of 40 points)

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV A-17 Transmission Lines Exam Content Outline

15%

Transformers

Transformer installation (6 items)

12%

Electrical Knowledge

Electrical theory for transmission (5 items)

12%

Conductors

Overhead conductors (5 items)

28%

Overhead Lines

Primary overhead lines (11 items)

10%

Equipment and Safety

Line equipment and safety (4 items)

8%

Grounding Methods

System grounding (3 items)

8%

Poles and Structures

Poles, towers, anchors, and guys (3 items)

8%

Electric Supply Stations

Substations and supply stations (3 items)

How to Pass the NV A-17 Transmission Lines Exam

What You Need to Know

  • Passing score: 70% (28 of 40 points)
  • Assessment: Closed Book computer-based multiple-choice. See the current PSI Nevada contractor bulletin for allowed and closed-book references.
  • Time limit: 1.5 hours
  • Exam fee: USD 95

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NV A-17 Transmission Lines Study Tips from Top Performers

1Distribute study time to the official bulletin 291 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada A-17 Lines to Transmit Electricity Contractor Examination?

The official PSI examination has 40 scored questions. Passing is 70% (28 of 40 points) within 1.5 hours (Candidate Information Bulletin 291, updated 3/25/2026).

How much does the NV A-17 Transmission Lines exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV A-17 Transmission Lines exam open book?

No. PSI lists this examination as closed book. Study the bulletin reference list before the appointment; those books are not allowed in the center.

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.