Exam 21: Control and Controlled Devices

The difference between a motor starter and a relay or contactor is that a motor starter also contains ____________________ protection for the motor.

What are the three methods of operating a photoelectric switch?

A capacitive proximity switch senses conductive and non-conductive material.

What are the two versions of the inductive proximity switch?

Pushbutton switches are manually operated and require a turning motion to operate.

When a relay is in its de-energized state, a magnetic field exists in the coil.

Inductive proximity switches will not detect ____.

Which of the following is not a type of relay?

The letters NO represent ____.

When a relay is de-energized, ____.

What kind of switches are designed to switch higher voltages and currents?

A relay is a(n) ____________________ switch.

Some type of human intervention is needed to operate ____________________ devices.

Photoelectric switches have all but which of the following components?

A retroreflective device transmits the light to a reflector and detects the reflected light at its receiver.

Which of the following is not a part of a limit switch?

____________________ switches are noncontact-type switches that are used to sense the presence or absence of an object without actually contacting the object.

The make-before-break switch is used in circuits that cannot tolerate the brief open-circuit condition created by the break-before-make switch.