Variable resistors are known by several common names, including potentiometer and ____.

a. rheostat
b. timostat
c. rhysostat
d. rheometer


a. rheostat

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In regard to the firing of the SCR or the gate control, the ____________________ control method is the least costly control scheme and provides the least amount of control.

Fill in the blank(s) with the appropriate word(s).

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Answer the following statement(s) true (T) or false (F)

1. Developing a wiring diagram from a schematic is the same basic procedure that is followed when installing a control system. 2. Understanding the development of a wiring diagram from a schematic is a great advantage when troubleshooting existing circuits. 3. In a schematic, a system of equations is often used to aid in the connection of the circuit. 4. A double pole double-throw switch is generally marked with one common terminal, one terminal marked NC, and a third terminal marked NO. 5. Once the components of the wiring diagram have been numbered with the same numbers as those on the schematic, the circuit can be connected by connecting like numbers.

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En la Figura 3, el componente marcado con 1 es un:



a. contacto de sobrecarga.
b. ensamble del calentador por aleación de fusión.
c. terminal de carga.
d. terminal de reinicio.

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When cooling tower water is used to cool the building directly it is known as _____________.