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100+ Free MS Residential Electrician Practice Questions

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2026 Statistics

Key Facts: MS Residential Electrician Exam

70%

Passing Score

PSI MS Contractor Bulletin 4/23/2026

60 Q

Official Exam Questions

PSI MS Contractor Bulletin 4/23/2026

3 hours

Time Allowed

PSI MS Contractor Bulletin 4/23/2026

$120

PSI Exam Fee

PSI MS Contractor Bulletin 4/23/2026

Open book

Exam Format

PSI MS Contractor Bulletin 4/23/2026

MS Residential Electrician PSI trade exam: 60 questions, 70% pass, 3 hours, fee $120. Open-book MSBOC classification (bulletin 4/23/2026).

Sample MS Residential Electrician Practice Questions

Try these sample questions to test your MS Residential Electrician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to NEC 90.1(A), what is the stated purpose of the National Electrical Code?
A.To serve as a design specification and instruction manual for untrained persons
B.The practical safeguarding of persons and property from hazards arising from the use of electricity
C.To establish the most efficient and least-cost wiring methods for dwellings
D.To set energy-conservation targets for residential electrical systems
Explanation: NEC 90.1(A) states that the purpose of the Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. The NEC is a minimum safety standard. It is not written as a design specification, a construction-efficiency guide, or an energy code.
2Per NEC Article 100, a qualified person is one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and who has also received:
A.A Mississippi contractor license, regardless of field training
B.Safety training to recognize and avoid the hazards involved
C.Permission from the utility to work on the load side of the meter
D.At least 40 hours of first-aid instruction
Explanation: Article 100 defines a qualified person as one with the skills and knowledge related to the construction and operation of the electrical equipment and installations and who has received safety training to recognize and avoid the hazards involved. Licensure, utility permission, or first-aid hours alone do not meet that definition.
3A resistive baseboard heater draws current from a 240-volt circuit and has a measured resistance of 19.2 ohms. Using Ohm's law (I = E / R), what is the current?
A.8.0 amperes
B.10.0 amperes
C.12.5 amperes
D.19.2 amperes
Explanation: Ohm's law for current is I = E / R. Dividing 240 volts by 19.2 ohms gives 12.5 amperes. Ugly's and the NEC calculation questions use this same relationship for purely resistive loads.
4A 120-volt branch circuit supplies a purely resistive load that draws 12.5 amperes. What is the power of the load (P = E × I)?
A.96 watts
B.1,200 watts
C.1,500 watts
D.3,000 watts
Explanation: Power in a resistive circuit is P = E × I. Multiplying 120 volts by 12.5 amperes equals 1,500 watts. That is the familiar rating of many portable heaters and a useful check against nameplate VA on the exam.
5In a parallel 120-volt residential branch-circuit arrangement, which quantity is the same across each load?
A.Current through each load
B.Resistance of each load
C.Voltage across each load
D.Wattage of each load
Explanation: Loads connected in parallel are connected across the same two circuit conductors, so each load sees the same voltage. Current then divides according to each load's resistance, and wattage differs unless the loads are identical.
6Per NEC 90.4, who has the authority to interpret the Code rules, decide on approval of equipment and materials, and grant special permission?
A.The licensed electrical contractor
B.The authority having jurisdiction (AHJ)
C.The National Fire Protection Association staff
D.The electric utility meter department
Explanation: NEC 90.4 assigns interpretation, equipment approval, and special permission to the authority having jurisdiction. On a Mississippi dwelling that is usually the local building official or electrical inspector, not the contractor, NFPA, or the utility.
7Per NEC Article 100, a load is a continuous load when the maximum current is expected to continue for how long?
A.30 minutes or more
B.1 hour or more
C.2 hours or more
D.3 hours or more
Explanation: Article 100 defines a continuous load as a load where the maximum current is expected to continue for 3 hours or more. That definition drives the 125 percent conductor and overcurrent-device sizing rules used for water heaters, space heating, and similar residential loads.
8Two resistive heating elements of 16 ohms and 8 ohms are connected in series to a 240-volt source. What is the circuit current?
A.10 amperes
B.15 amperes
C.20 amperes
D.30 amperes
Explanation: Series resistances add, so the total resistance is 16 + 8 = 24 ohms. Current is 240 V / 24 Ω = 10 A. The same 10 A flows through both elements.
9A 240-volt, single-phase, 4,800-volt-ampere load operates at 100 percent power factor. What is the line current (I = VA / E)?
A.10 amperes
B.15 amperes
C.20 amperes
D.40 amperes
Explanation: For a single-phase load, I = VA / E. Dividing 4,800 VA by 240 V equals 20 A. At unity power factor, watts and volt-amperes are the same number.
10Using the conversion 1 horsepower = 746 watts, what is the output of a 2-horsepower motor in watts?
A.746 watts
B.1,000 watts
C.1,492 watts
D.2,000 watts
Explanation: One horsepower equals 746 watts, so 2 HP equals 1,492 watts of mechanical output. Input watts will be higher once efficiency and power factor are applied, but the output conversion itself is 2 × 746.

About the MS Residential Electrician Exam

Mississippi Residential Electrician Contractor Examination is a classification trade examination administered by PSI for the Mississippi State Board of Contractors. The official open-book exam has 60 questions, a 70% passing standard, and 3 hours allowed. PSI examination fee is $120 per portion (bulletin updated 4/23/2026). This English-language MCQ bank is a study aid for the official content outline; it is not an official PSI form, does not replace the required Law and Business Management exam, and is not a substitute for MSBOC application review or the official open-book examination.

Questions

60 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

$120 (PSI Services LLC (for Mississippi State Board of Contractors))

MS Residential Electrician Exam Content Outline

22%

General Electrical Knowledge

Residential electrical theory

25%

Services, Feeders, and Branch Circuits

Residential services and branch circuits

8%

Overcurrent Protection

Overcurrent protection

10%

Grounding and Bonding

Grounding and bonding

8%

Conductors and Cables

Residential conductors

7%

Raceways and Boxes

Raceways and boxes

7%

Lighting

Residential lighting

7%

Specialty

Special residential equipment

7%

Safety

Electrical safety

How to Pass the MS Residential Electrician Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 60 questions
  • Time limit: 3 hours
  • Exam fee: $120

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

MS Residential Electrician Study Tips from Top Performers

1Study only the approved references listed for this classification in the current PSI Mississippi Contractor bulletin (updated 4/23/2026)
2Practice open-book navigation with permanent tabs and indexes before test day
3Drill OSHA 29 CFR 1926 topics that appear across nearly every trade outline
4Confirm MSBOC classification scope and eligibility at msboc.us before scheduling with PSI
5All applicants must also pass Law and Business Management unless it is waived

Frequently Asked Questions

How many questions are on the MS Residential Electrician exam?

The official PSI examination has 60 scored questions (plus possible unscored experimental items). Passing is 70% within 3 hours.

How much does the MS Residential Electrician exam cost?

PSI lists $120 per examination portion (Candidate Information Bulletin updated 4/23/2026). MSBOC application fees are separate: $400 commercial or $50 residential. Additional classifications are $100 each.

Is the Mississippi contractor exam open book?

Yes. PSI administers MSBOC classification exams as open book. Only bulletin-listed approved references are allowed; temporary tabs such as Post-it notes are prohibited.

Do I still need the Law and Business Management exam?

Yes. MSBOC requires the Mississippi Law and Business Management exam (50 questions, 70%, 2 hours) of all applicants. Reciprocity may waive a trade exam in some cases but does not waive Law and Business.