Question 1: Themisters are used to measure which of the following quantity?
- Temperature
- Resistance
- Pressure
- Humidity
HVAC
NEC 2023
HVAC Controls Practice Questions(sensor)-2
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TimeHVAC Controls Practice Questions(sensor)-2 — Question List
Question 2: Which of the following is the magnetic flow meter output signal?
- Voltage signal
- Pneumatic signal
- Hydraulic signal
- Pressure signal
Question 3: The amount of water vapor that moisture contains increases rapidly with increase in temperature.
- True
- False
Question 4: What is the maximum allowed relative humidity to maintain indoor air quality as per ASHRAE?
- 65 %
- 85 %
- 90 %
- 70 %
Question 5: A bourdon tube sensor is used to measure ………..
- Temperature
- Pressure
- Flow velocity
- Humidity
Question 6: Magnetic flow measures the flow rate by ………………………. Caused by the moving fluid when exposed to strong magnetic field?
- Magnetic induction
- Electric induction
- Acceleration of diaphragm
- Movement of the coil
Question 7: The aim of HVAC control system
- Lower energy cost
- Increase flexibility
- Lower operating cost
- All the options are correct
Question 8: Which of the following device is self powered control device?
- Thermopile
- Thermocouple
- Thermister
- Thermostat
Question 9: What may be maximum pressure that self powered VAV diffuser can operate?
- 60 kpa
- 20 kpa
- 50 kpa
- 90 kpa
Question 10: Which of the following is not a self powered control device?
- Thermopile
- VAV diffuser
- VAV diffuser Hot Water Control Valve
- Pneumatic
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