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.
Which of the following is true of thermistors?
Which of the following is true of temperature transmitters?
Temperature sensors are used to measure a variety of variables, including:
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.
To measure the temperature of fluid in pipes, normally a/n ____ is used.
_____ measure the relative level of moisture in the air, and are important in critical environments like libraries, labs and data centers.
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.
Which of the following gases are relevant for monitoring in a building system?
This type of flowmeter measures the speed of the flow and uses the cross-sectional area to calculate the volume that has passed through.
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
e. Sensors must be correctly positioned, e.g. outside temperature sensors should not be positioned in full sun.
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- 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
- 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.
Read Also
- MCQ on Building Controls I: An Introduction to Building Controls | Primo Engineering
- MCQ on Building Controls II: Control Sensors | Primo Engineering
- MCQ on Building Controls III: Introduction to Control Loops | Primo Engineering
- MCQ on Measurement and Verification Including IPMVP Course
- MCQ on A Comparison of AC and DC Power Distribution in the Data Center Answer
- MCQ on HVAC Thermodynamic States | ENERGY UNIVERSITY COURSES
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