Title: Unit 9 Quiz
Course: REEC 220 Solar Thermal Systems > Section: REEC 220 Solar Thermal Systems

Q: A set point controller turns on or off the solar thermal system when ___________.
- voltage rises or falls
- temperatures rise or fall
- current hits set points
A: temperatures rise or fall

Q: Analog controllers _____.
- are an older design that measures voltage to turn on off pumps
- use set points and can fail in an unsafe manor
- both answers are correct
- none of the answers are correct
A: both answers are correct

Q: 1. Digital Controllers are?
- A. Use simple on off controls
- B. Has dynamic set points and monitors many sensors
- C. Is sensitive to power outages and loses memories
A: B. Has dynamic set points and monitors many sensors

Q: What does RTD stand for?

Q: Solid wire is preferred to stranded for sensor wire.
- True
- False
A: False

Q: The ideal location for the tank sensor is at the very bottom of the tank.
- True
- False
A: False

Q: Thermistor type sensors change what?
- The current of the sensor
- The voltage of the sensor
- The resistance of the sensor
A: The resistance of the sensor

Q: Typically the maximum collector temperature is set at what value?
- 260° F
- 270° F
- 280° F
A: 270° F

Q: Vacation mode is a setting that will do what?
- Cycle HTF back into the collectors at night
- Pulse the pump when residents are on vacation
- Stops the pumps when residents are on vacation
A: Cycle HTF back into the collectors at night

Q: Relay is a device that allows the controller to electrically energize the pump.
- True
- False
A: True