Previous HVAC Basic Electrical Questions -3

HVAC NEC 2023

HVAC Basic Electrical Questions -4

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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 -4 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 -4 — Question List

Question 1: To protect an electrical circuit a fuse should be placed in ………………….

Series
Parallel
Both series and parallel

Question 2: If the is no deflection in a voltmeter which is used to measure voltage between two electrical contacts it indicates ……………..

Two contacts are shorted
Two contacts are opened
Two contacts are driven by same voltage source
Same current is flowing across two contacts

Question 3: The primary winding of a transformer has 1000 turns and secondary coil has 400 turns. What will be its secondary voltage if 480 volts is applied at primary?

192 volts
240 volts
480 volts
1200 volts

Question 4: A magnetic field seeks the path of ………….

Low reluctance
High reluctance
Less resistance
High resistance

Question 5: Which of the following meter is used to measure electrical pressure in the circuit?

Voltmeter
Ammeter
Ohmmeter
Wattmeter

Question 6: Which of the following is used to measure high resistance of circuit?

Series ohmmeter
Shunt ohmmeter
Impedance meter
Wattmeter

Question 7: Battery cells connected in parallel produces ………….

Higher current
Higher voltages
High power

Question 8: Which of the following battery cell can be recharged?

Primary cell
Secondary cell

Question 9: How many 1.5 volts cells should be connected in series to form a 9 volt battery?

4
6
9
2

Question 10: A primary cell is a device which converts …………………

Chemical energy into electrical energy
Electrical energy into chemical energy
Mechanical energy into electrical energy
Electrical energy into mechanical energy

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