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MCQ on Building Controls II: Control Sensors | Primo Engineering

True or false? Sensors can be a weak link in a building control system because if the control system is getting a signal from a faulty sensor, the control system makes wrong decisions, which can result in wasted energy and wasted money.
  • True
  • False


Which of the following is true of thermistors?
  • They are inexpensive
  • They require a source of power
  • They are consistent in their performance over time
  • They have excellent resolution that allows them to be used where precision control is a requirement


Which of the following is true of temperature transmitters?
  • They are inexpensive
  • They have adequate resolution for commercial applications
  • They do not deliver the performance required for critical applications requiring high accuracy
  • They require a source of power


Temperature sensors are used to measure a variety of variables, including:

  • Outside air temperature
  • The occupied space temperature
  • Various temperatures within the mechanical system
  • All of the above


Direct sunlight on an outside air temperature sensor will give the controller a false sense of the actual ambient temperature when making decisions. For buildings located in the northern hemisphere, the _____ side of the building is the best place to locate the outside air temperature sensor.
  • North
  • South
  • East
  • West


To measure the temperature of fluid in pipes, normally a/n ____ is used.
  • Humidity sensor
  • Temperature transmitter sensor
  • Immersion sensor with well
  • Averaging sensor


_____ measure the relative level of moisture in the air, and are important in critical environments like libraries, labs and data centers.
  • Humidity sensors
  • Temperature transmitter sensor
  • Immersion sensor
  • Strap-on sensor


True or False? There are practical limits on the distance between a sensor and the controller. Manufacturers provide specific guidelines on how far a sensor can be located from the controller for accurate control.
  • True
  • False


Which of the following gases are relevant for monitoring in a building system?
  • Carbon monoxide
  • Carbon dioxide
  • Refrigerants
  • All of the above


This type of flowmeter measures the speed of the flow and uses the cross-sectional area to calculate the volume that has passed through.
  • Differential pressure flow meter
  • Positive displacement flowmeter
  • Velocity flowmeter
  • Mass meters

Summary of Building Controls II: Control Sensors Course


a. Sensors measure the data that the controller uses to make decisions based on its set of programmed standards and set points. Sensors are the first step of control.

b. The communication from the sensors to the controllers is almost always electrical. The firmware in the controller is designed to interpret changes in the electrical inputs that it receives from the sensors.

c. Sensors must not be too far from their controller, or losses due to electrical resistance will cause measurement errors

d. Today we talked about many different types of sensors; each suits a different purpose within an energy efficient building control plan
MCQ on Building Controls II: Control Sensors | Primo Engineering
  • i. Temperature sensors
  • ii. Relative humidity sensors
  • iii. Pressure sensors
  • iv. Flow meters
  • v. Electrical sensors
  • vi. Gas sensors
  • vii. Switches
  • viii. Occupancy sensors

e. Sensors must be correctly positioned, e.g. outside temperature sensors should not be positioned in full sun.

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