1. Electrical contacts must never be permitted to open or close slowly.
a. True
b. False
2. A bimetal strip is often formed into a spiral.
a. True
b. False
3. The amount of voltage produced by a thermocouple is generally in the order of megavolts.
a. True
b. False
4. A thermistor with a negative temperature coefficient will exhibit an increase of resistance with an increase in
temperature.
a. True
b. False
5. One common method of sensing temperature is by the increase of pressure of some chemicals.
a. True
b. False
Name: Class: Date:
Unit 16 Temperature Switches
6. The ____ relay is so named because it uses a length of resistive wire connected in series with the motor to sense
motor current.
a. serial thermostat b. movable arm
c. solid-state starting d. hot-wire starting
7. The bimetal strip is made by bonding two ____ types of metal together.
a. similar b. dissimilar
c. related d. compatible
8. Because the voltage of thermocouples is so low, they are often connected in series. This connection is referred to as
a ____.
a. type J thermocouple b. thermistor
c. thermopile d. serial thermocouple
9. Thermistors are actually ____ sensitive semiconductor devices.
a. thermally b. voltage
c. contraction d. pressure
10. Becauseofthethermistor’sabilitytochangeitsresistance____,theyarecommonlyusedassolidstatestarting
relays.
a. rapidly b. negatively
c. slowly d. in calibrated increments
Name: Class: Date:
Unit 16 Temperature Switches