Question 1: In which of the following controls the signal transmission is air pressure?
- Self powered controls
- Pneumatic controls
- Electric controls
- Hydraulic controls
HVAC
NEC 2023
HVAC Controls Practice Questions(sensor)-1
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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.
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TimeHVAC Controls Practice Questions(sensor)-1 — Question List
Question 2: If the valve opens when the control signal is applied, this valve is called as ………….
- Normally open type
- Normally closed type
Question 3: The controlled device receives the signals from …………….
- Sensor
- Controller
- Thermocouple
- Thermostat
Question 4: Which of the following is the suitable current signal range?
- 0 mA to 20 mA
- 4mA to 20 mA
- 1mA to 20 mA
- 6 mA to 10 mA
Question 5: Which of the following is the primary controlled variable in HVAC applications?
- Temperature
- Humidity
- Air velocity
- Radiant temperature
Question 6: In HVAC applications for higher temperature measurement which of the following sensors is generally used?
- Thermocouples
- RTD
- Bimetal
- Thermostat
Question 7: Which of the following temperature sensor has high sensitivity?
- Thermister
- Thermocouple
- RTD
- Bimetal
Question 8: The RTD temperature sensor have a …………….. temperature coefficient.
- Positive
- Negative
- Zero
Question 9: When the length of the wire has increased, the resistance of the wire ……………………
- Increases
- Decreases
- Remains same
Question 10: Pitot tube is used to measure ………………..
- Air flow velocity
- Temperature
- Pressure
- Humidity
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