Electronic Sensor Applications

Devices consisting of a glass tube containing two small ferromagnetic (easily magnetized) metal reeds are called __________.

• magnetic reed switches

• hall-effect sensors

• photoelectric sensors

• capacitive sensors

The magnetic reed switch is a fast operating, single-pole, single-throw switch with a __________.

• N.O. contact

• N.C. contact

• transistor output

• None of the above

__________ materials conduct magnetic lines of force very well.

• Ferromagnetic

• Paramagnetic

• Diamagnetic

• All of the above

__________ materials, such as aluminum and platinum, conduct magnetic lines of force poorly.

• Ferromagnetic

• Paramagnetic

• Diamagnetic

• Both Ferromagnetic and Paramagnetic

The Hall-Effect sensor uses the principle of __________ to sense the presence of a magnetic object.

• inductive reactance

• capacitive reactance

• transduction

• specular reflection

A Hall-Effect sensor that senses only __________ can help avoid false triggering of the sensor.

• metallic objects

• magnetic objects

• one magnetic polarity

• None of the above

If the Hall effect sensor's amplifier is __________, the output of the switch will rapidly change from one state to the other when a magnetic field is sensed by the device.

• a NPN transistor

• a PNP transistor

• analog

• digital

The photoelectric sensor uses the principle of __________ to sense the presence of an object.

• photoreactance

• phototransduction

• photoconduction

• photodiode

To keep a photoelectric sensor from being actuated by sunlight or regular lighting, sensors generally use __________ light.

• visible

• ultraviolet

• x-ray

• infrared

When light that strikes a highly polished target is reflected away at the same angle that it strikes the object's surface, it is called __________ reflection.

• retro

• specular

• diffuse

• opposed sensing