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100+ Free MS Master Electrician Practice Questions

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2026 Statistics

Key Facts: MS Master Electrician Exam

70%

Passing Score

PSI MS Contractor Bulletin 4/23/2026

80 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 Master Electrician PSI trade exam: 80 questions, 70% pass, 3 hours, fee $120. Open-book MSBOC classification (bulletin 4/23/2026).

Sample MS Master Electrician Practice Questions

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

1A 480-volt, three-phase feeder on a Mississippi commercial job supplies a balanced load of 75 amperes at a lagging power factor of 0.90. Using √3 = 1.732, what is the real power of this load?
A.56.1 kW
B.62.4 kVA
C.32.4 kW
D.36.0 kW
Explanation: Three-phase real power is P = √3 × V_line × I_line × PF. Substituting the given values yields P = 1.732 × 480 V × 75 A × 0.90 = 56,117 W, which is 56.1 kW. The Mississippi Master Electrician open-book exam expects this Ugly's/NEC power formula, not apparent power.
2A 60 Hz series circuit contains 12 ohms of resistance, 16 ohms of inductive reactance, and 7 ohms of capacitive reactance. What is the total impedance?
A.35 ohms
B.15 ohms
C.21 ohms
D.9 ohms
Explanation: Series impedance is Z = √(R² + (X_L − X_C)²). Net reactance is 16 − 7 = 9 ohms, so Z = √(12² + 9²) = √(144 + 81) = √225 = 15 ohms. Resistance and reactance cannot be added as scalars because they are 90 degrees out of phase.
3A 112.5 kVA, three-phase transformer has a 480-volt primary and a 208Y/120-volt secondary. Using √3 = 1.732, what is the secondary full-load line current?
A.135 A
B.541 A
C.312 A
D.208 A
Explanation: Three-phase transformer current is I = (kVA × 1000) / (√3 × V_line). Secondary current is 112,500 / (1.732 × 208) = 112,500 / 360.3 = 312 A. Primary current at 480 volts is only 135 A and is the usual trap on Master Electrician calculations.
4A 480-volt, three-phase circuit carries 90 amperes for 180 feet on copper conductors. Use K = 12.9, √3 = 1.732, and a circular-mil area of 83,690 CM for 1 AWG. What is the voltage drop?
A.5.0 V
B.7.5 V
C.2.5 V
D.4.3 V
Explanation: Three-phase voltage drop is VD = (√3 × K × I × L) / CM. Substituting gives (1.732 × 12.9 × 90 × 180) / 83,690 = 361,953 / 83,690 = 4.3 V. That is about 0.9 percent of 480 volts and well inside the recommended 3 percent branch-circuit limit.
5What is the peak (zero-to-peak) value of a 277-volt RMS sinusoidal line-to-neutral voltage? Use √2 = 1.414.
A.391.7 V
B.277.0 V
C.196.0 V
D.783.4 V
Explanation: For a sine wave, V_peak = V_RMS × √2. Therefore 277 × 1.414 = 391.7 V. Peak-to-peak voltage would be twice that value, 783.4 V, and is a different quantity.
6A purely resistive 240-volt heater has a resistance of 16 ohms. What current does the heater draw, and what is its power?
A.16 A and 3,840 W
B.15 A and 3,600 W
C.12 A and 2,880 W
D.20 A and 4,800 W
Explanation: Ohm's law gives I = E / R = 240 / 16 = 15 A. Power is P = E × I = 240 × 15 = 3,600 W, which also equals I²R = 225 × 16 = 3,600 W. These are the basic Ugly's relationships used throughout the MSBOC Master Electrician exam.
7A three-phase motor load measures 40 kW of real power and 50 kVA of apparent power. What is the power factor, and what is the reactive power?
A.0.80 lagging and 10 kVAR
B.1.25 leading and 30 kVAR
C.0.80 lagging and 30 kVAR
D.0.64 lagging and 40 kVAR
Explanation: Power factor is P / S = 40 / 50 = 0.80. Reactive power is Q = √(S² − P²) = √(2,500 − 1,600) = √900 = 30 kVAR. The 3-4-5 triangle (30-40-50) is the standard Ugly's power-triangle shortcut.
8Two 20-ohm resistors are connected in parallel, and that combination is in series with a 15-ohm resistor. The circuit is supplied at 100 volts DC. What is the total current?
A.2.0 A
B.6.7 A
C.1.8 A
D.4.0 A
Explanation: Two equal 20-ohm resistors in parallel equal 10 ohms. Adding the series 15-ohm resistor gives 25 ohms total. I = 100 V / 25 Ω = 4.0 A. Each 20-ohm resistor then carries 2.0 A.
9Using the NEC 2020 standard calculation, a 2,800-square-foot dwelling has a general lighting unit load of 3 VA per square foot, two small-appliance branch circuits, and one laundry branch circuit. After applying Table 220.42 dwelling demand (first 3,000 VA at 100 percent, remainder at 35 percent), what is the demand-loaded general lighting and receptacle load?
A.6,465 VA
B.12,900 VA
C.8,400 VA
D.4,515 VA
Explanation: General lighting is 2,800 × 3 = 8,400 VA. Add 2 × 1,500 VA small-appliance and 1,500 VA laundry per 220.52 to get 12,900 VA. Table 220.42 then takes 3,000 VA at 100 percent plus 35 percent of the remaining 9,900 VA (3,465 VA), for 6,465 VA. That figure is only the lighting/receptacle demand; ranges, dryers, and HVAC are added separately.
10A feeder supplies an 80-ampere continuous load and a 50-ampere noncontinuous load. Per NEC 2020 215.2(A)(1) and 215.3, what is the minimum ampacity and overcurrent-device rating basis for that feeder?
A.130 A
B.150 A
C.163 A
D.100 A
Explanation: NEC 215.2(A)(1) and 215.3 require feeder conductors and overcurrent protection to be sized at 125 percent of the continuous load plus 100 percent of the noncontinuous load. That is (80 A × 1.25) + 50 A = 100 + 50 = 150 A. The 125 percent factor covers extra heating from a load expected to run three hours or more.

About the MS Master Electrician Exam

Mississippi Master Electrician Contractor Examination is a classification trade examination administered by PSI for the Mississippi State Board of Contractors. The official open-book exam has 80 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

80 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

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

MS Master Electrician Exam Content Outline

8%

General Electrical Knowledge

Electrical theory and general knowledge

13%

Service, Feeders, and Branch Circuits

Services, feeders, and branch circuits

9%

Grounding and Bonding

Grounding and bonding

13%

Conductors and Cables

Conductor and cable selection

9%

Raceways and Boxes

Raceways and boxes

9%

Special Occupancies and Equipment

Special occupancies and equipment

8%

Electrical Power

Electrical power systems

8%

Motors

Motors and motor circuits

3%

Low Voltage

Low-voltage systems

4%

Lighting

Lighting systems

3%

Illuminated Signs

Electric signs

4%

Fire Detection and Alarm Systems

Fire detection and alarms

6%

Safety Information

Electrical safety

8%

Overcurrent Protection

Overcurrent protection

How to Pass the MS Master Electrician Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 80 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 Master 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 Master Electrician exam?

The official PSI examination has 80 scored questions (plus possible unscored experimental items). Passing is 70% within 3 hours.

How much does the MS Master 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.