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HVAC NEC 2023

HVAC Basic Electrical Questions -2

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HVAC electrical exams cover electrical theory (Ohm's Law, circuits), transformers, single-phase and three-phase motors, control wiring, safety, and troubleshooting.

Requirements vary by state. HVAC technicians typically need EPA 608 certification and may need a separate electrical license for line voltage work.

How to Use This Practice Test

This HVAC Basic Electrical Questions -2 has 10 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Draw out series and parallel circuits on paper as you answer — visual thinking helps with circuit analysis questions.

Topics covered: Ohm's Law, motor types, transformers, control wiring, and troubleshooting HVAC electrical systems.
Passing score: Aim for 80%+ on practice tests to build confidence for the real exam.
Questions: 10 multiple-choice, one correct answer each

10

Questions

15 min

Time

70%

Pass

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HVAC Basic Electrical Questions -2 — Question List

Question 1: The input side of the transformer is termed as ……………………….

Primary side
Secondary side
High voltage side
Low voltage side

Question 2: What is the measuring unit of inductance?

Henry
Farad
Ohm
Mho

Question 3: If smallest resistance and higher resistance resistors are connected in parallel, what will be its equivalent resistance?

Less than smallest resistance resistor
Equal to smallest resistance resistor
Equal to highest resistance resistor
Higher than smallest resistance resistor and lesser than highest resistance resistor

Question 4: The strength of electronic magnet or coil conductor depends on the amount of ……………………

Current flow in the coil
Voltage applied to the coil
Power of the coil

Question 5: An electric current seeks the path of ……………..

Low resistance
High resistance
Low reluctance
High reluctance

Question 6: A magnetic field seeks the path of ………….

Low reluctance
High reluctance
Less resistance
High resistance

Question 7: A DC meter can be used to measure AC by inserting a ………………….. in series with meter movement?

Rectifier
Capacitor
Impedance
Inductor

Question 8: A meter which is used to measure low resistances is ……………..

Series ohmmeter
Shunt ohmmeter
Impedance meter
Combination of voltmeter and ammeter

Question 9: Which of the following is used to check insulation breakdown in motors and compressors?

Shunt ohmmeter
Multimeter
Megger
Capacitive volt meter

Question 10: A halogen leak detector can detect refrigerant leaks as small as …………….ounce per year

0.5
1
1.5
2

Key NEC References for This Test

Article	What It Covers
Art. 440	Air Conditioning Equipment — use nameplate MCA and MOCP, not FLA alone
Art. 430	Motors — general motor rules that Art. 440 modifies

Study Tip: Practice reading ladder diagrams. Trace each rung from L1 to the load: contacts open → circuit dead. Contacts closed → current flows. This is how HVAC electrical troubleshooting works.

EXAM CARD HVAC

Questions10

Time limit15 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

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Source: NEC 2026 Art. 440 & electrical theory