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HVAC NEC 2023

HVAC Controls Practice Questions(sensor)-5

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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.

10

Questions

15 min

Time

70%

Pass

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HVAC Controls Practice Questions(sensor)-5 — Question List

Question 1: The RTD temperature-resistance characteristic is linear.

True
False

Question 2: When the capacitance sensor is used to measure fluid level in tank, the capacitance valve will ………….. with increase in fluid level.

Increase
Decrease

Question 3: The resistance of RTD ………………. With increase in temperature.

Increases
Decreases

Question 4: Which of the following sensors are used to measure dew point?

Chilled Mirror Hygrometers
Pitot-static tube
Thermister
Magnetic meter

Question 5: …………………………………………….. helps in measuring dew point.

Pressure and temperature
Flow and pressure
Temperature and humidity
Humidity and pressure

Question 6: Which of the following sensor uses frequency to measure relative humidity?

Quartz crystal
Magnetic meter
Pitot-static tube
Ultrasonic

Question 7: When liquid velocity increases the induced voltage in the magnetic flow meter ……………..

Increases
Decreases

Question 8: Which of the following temperature sensor is most suitable to measure 1000 <sup>0</sup> F?

RTD
Thermister
Thermocouple
Thermostat

Question 9: In low temperature measurements the error in the RTD measurement will be high.

True
False

Question 10: When the length of the wire has increased, the resistance of the wire ……………………

Increases
Decreases
Remains same

EXAM CARD HVAC

Questions10

Time limit15 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

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