1. The operation of a float switch is controlled by the forward or backward movement of a float placed in a water tank.
a. True
b. False
2. An electrode, or stainless steel probe system, conducts a circuit in the liquid instead of using floats.
a. True
b. False
3. The mercury bulb switch appears to be a rubber bulb connected to a conductor.
a. True
b. False
4. In a mercury bulb-type float switch, when the liquid level is below the position of the bulb, the bulb is in a horizontal
position.
a. True
b. False
5. One mercury bulb float switch is used to control a pump motor.
a. True
b. False
Name: Class: Date:
Unit 11 Float Switches
6. A float switch is used when a pump motor must be started and stopped according to changes in the ____ in a tank
or sump.
a. mercury level b. Bourdon
c. water pressure d. liquid level
7. The float switch contacts may be either normally open or normally closed and ____.
a. may not be submerged b. may not be suspended
c. may be submerged d. may be suspended
8. ____ methods of control may be used in place of the basic float switch for liquid level control.
a. Magnetic b. Electronic
c. Liquid d. Rod-based
9. In a mercury bulb-type of float switch, a set of mercury contacts is located inside the ____.
a. conductor b. bulb
c. motor d. tank
10. When the mercury bulb-type float switch changes position, ____.
a. the mercury contacts multiply
b. the mercury bulb-type float switch is no longer usable
c. the pump begins operation
d. the state of the contacts in the mercury switch are changed
Name: Class: Date:
Unit 11 Float Switches