4th Class Power Engineering Unit A9 Chapter 6: Electrical Control Systems 100% Verified

4th Class Power Engineering Unit A9 Chapter 6: Electrical Control Systems 100% Verified This type of thermostat is equipped with an open-contact switch or a snap switch: Select one: a. on-off control b. two position c. modulating d. multipositon a A two-terminal variable resistor used for varying current in a circuit is known as a: Select one: a. potentiometer b. rheostat c. thermistor d. photoresistor b These can be either normally closed or normally open: Select one: a. stepper valves b. drive valves c. modulating valves d. solenoid valves d A _________ is a device that controls large amounts of energy with small amounts of energy: Select one: a. delay b. relay c. micro switch d. controller b This measures the relative humidity of air in a room or in an air duct: Select one: a. humidiscope b. humidistar c. humidistat d. humidiprobe c Low pressure controllers measure and control low pressure or vacuums, measured in: Select one: a. mm of light oil b. kN or mm of mercury c. mm of water d. kPa or mm of mercury c A _________ thermostat operates like an on-off type, however it has two or more switches that operate in sequence: Select one: a. modulating b. multi-position c. two position d. aquastat b This component of an electrical control