Question 1: ………………………… sensors are used to measure temperature in ducts, piper and tanks.
- Capillary sensors
- RTD
- Bimetallic strips
- Thermocouples
HVAC
NEC 2023
HVAC Controls Practice Questions(sensor)-4
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TimeHVAC Controls Practice Questions(sensor)-4 — Question List
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
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