A contactor is a relay that contains ____________________ contacts.

Regardless of the type of photoemissive device used, or the type circuit it is used in, the greatest advantage of the photoemissive device is ____________________.

Figure 22-1 In the accompanying figure, two float switches are necessary in this circuit because the tank is to be ____________________.

Which two taxonomic groups are in the correct sequence to be between Class and Genus?  (T 2)

____________________ are designed to produce an output voltage that is proportional to the strength of a magnetic field.

Circuits that permit the automatic starting of motors in sequence are rare.

Figure 17-11 The accompanying figure is showing a(n) ____________________.

Float switches are used to control the action of a(n) ____________________ in accordance with the level of a liquid in a tank or sump.

Instantaneous contacts change their positions immediately when the coil is energized and change back to their normal positions immediately when the coil is de-energized.

Air flow switches are often called ____________________.