Chapter 6
The light source used in most industrial photoelectric sensors is a
LED
An inductive proximity sensor is actuated by
a metal object
The most common actuated for a reed switch is
a permanent or electromagnet
The electromagnetic latching relay
all
capacitor proximity sensors
are actuated by both conductive an non-conductive materials
Fiber optic sensors
are not affected by electrical interference, carry light signals, use a flexible cable containing tiny fibers
A limit switch is usually actuated by..
contact with an object
An encoder is used to
convert motion into a digital signal
An actuator is a device that
converts an electrical signal into mechanical movement
Bar code scanners are used primarily for
data collection
An electromagnet control relay is basically a(n)
electromagnet used to switch contacts
A contactor:
is designed to handle heavy power loads
solenoid valves are available to control
oil flow, air flow, water flow
All servo motors
operate in the closed-loop mode
A thermocoulpe, when heated
produces a small DC votlage
The force applied to a strian gauge causes it to bend and change its
resistance
A tachometer normally refers to a____ used for speed measurements
small generator
A(n) ________ converts light energy directly into electric energy
solar cell
A_____ converts electrical puleses applied to it into discrete rotor
stepper motor
The abbreviations NO (normally open) and NC (normally closed) represent the electrical state of switch contacts when:
the switch is actuated
A_____ operates by sending waves toward a target and measuring the time it takes for the pulses to bounce back
ultrasonic sensor
Most proximity switches come equipped with an LED status indicator to:
verify the output switching action
A proximity switch can be actuated
without any physical contact