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HVAC NEC 2023

HVAC Controls Practice Questions(sensor)-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 Controls Practice Questions(sensor)-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 Controls Practice Questions(sensor)-4 — Question List

Question 1: ………………………… sensors are used to measure temperature in ducts, piper and tanks.

Capillary sensors
RTD
Bimetallic strips
Thermocouples

Question 2: The resistance of an element ……………….. to the cross sectional area of it.

Inversely proportional
Directly proportional

Question 3: Which of the sensors does not require external power supply?

RTD
Thermistor
Thermocouple
Thermostat

Question 4: In ultrasonic sensors, the fluid flow can be measured as a function of the ……………..

Difference between time travel of upward wave and the downstream wave
Difference between pressure of upward wave and the downstream wave
Pressure of the sound wave
Difference between velocity of upward and downstream wave

Question 5: Which of the following is not an electronic sensor?

Capillary sensor
RTD
Themister
Thermocouple

Question 6: The temperature which causes moisture in the air to condensate is …………………

Saturation temperature
Dew temperature
Super heat temperature
Boiling temperature

Question 7: What is the output voltage range of thermocouple temperature sensor?

Volts
milli-volts
Mega volts
Kilo volts

Question 8: What can be measured with bi-metalic strip sensor?

Temperature
Pressure
Humidity
Flow Velocity

Question 9: Which of the following sensors uses sound wave to measure the fluid velocity and fluid level?

Ultrasonic sensor
Magnetic flow meter
Pitot static tube
Capillary tubes

Question 10: The temperature –resistance characteristic of thermister is ……………

Linear
Non-linear

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