Solid-State Devices Flashcards
The ___ modes enable a photoelectric sensor to detect whether a target is present or absent.
A) light/dark operation
B) operating margin
C) response time
D) sensitivity
A) light/dark operation
___ proximity sensors can only detect metals that conduct current.
A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic
C) Inductive
For a BJT to operate as an amplifier, the base-emitter junction must be ___ biased and the base-collector junction must be ___ biased.
A) forward / forward
B) forward / reverse
C) reverse / forward
D) reverse / reverse
B) forward / reverse
The P side of a PN junction is referred to as the ___.
A) anode
B) cathode
A) anode
___ devices are non-contact solid-state devices that use light to detect the presence of objects.
A) Hall effect
B) Photoelectric
C) Triac
D) SCR
B) Photoelectric
___ is the process of converting an AC voltage to a DC voltage.
A) Alternation
B) Conversion
C) Doping
D) Rectification
D) Rectification
A ___ has three leads, identified as drain, source, and gate.
A) BJT
B) JFET
C) SCR
B) JFET
In an atom that has lost an electron, the place vacated by the free electron is referred to as a(n) ___.
A) hole
B) ion
C) proton
D) shell
A) hole
When the gate pulse is removed from an SCR, the SCR will stop conducting.
A) True
B) False
B) False
The size and dielectric properties of the object are the two factors that determine the effective sensing range of a ___ proximity sensor.
A) capacitive
B) inductive
C) ultrasonic
A) capacitive
Current can flow from anode to cathode in a diode if it is reversed biased and the ___ voltage is reached.
A) alternating
B) barrier
C) breakdown
D) pulsating
C) breakdown
A(n) ___ has three leads, identified as anode, cathode, and gate.
A) optocoupler
B) phototransistor
C) SCR
C) SCR
___ devices are solid-state sensors that detect the presence of a magnetic field.
A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic
B) Hall effect
___ is measured by the number of light pulses per second that a photoelectric device transmits.
A) Light/dark operation
B) Operating margin
C) Response time
D) Sensitivity
C) Response time
The ___ has three leads, identified as gate, main terminal 1, and main terminal 2.
A) diac
B) SCR
C) triac
C) triac
The ___ is controlled by current.
A) BJT
B) FET
C) SCR
A) BJT
Excess electrons can be added to intrinsic silicon or germanium by adding impurities such as ___, ___, and ___.
A) antimony / arsenic / bismuth
B) boron / gallium / indium
A) antimony / arsenic / bismuth
Proximity sensors that detect objects using an electromagnetic field are known as ___ devices.
A) capacitive
B) inductive
B) inductive
Zener diodes are designed to operate with a ___ bias voltage.
A) forward
B) reverse
B) reverse
The diac acts like two ___ diodes in series; therefore, it is primarily used as a triggering device for other semiconductors.
A) photo
B) SCR
C) zener
C) zener
A ___ has three leads identified as base, collector, and emitter.
A) BJT
B) JFET
C) Triac
A) BJT
A(n) ___ proximity sensor can detect a wide range of materials, including metals (ferrous and nonferrous), glass, plastics, and liquids.
A) capacitive
B) inductive
C) ultrasonic
A) capacitive
___ devices are solid-state sensors that detect the presence of a magnetic field.
A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic
B) Hall effect
A diode is forward biased when the cathode is connected to the ___ side of the external voltage source and the anode is connected to the ___ side.
A) negative / positive
B) positive / negative
A) negative / positive
Zener voltage remains reasonably constant over a wide range of zener currents.
A) True
B) False
A) True
What is the photoelectric scanning method in which the transmitter and receiver are housed in the same enclosure and in which a specialized scanning technique is used not only to determine when an object is moved into position but also to identify the specific location of the object?
A) Diffuse
B) Direct
C) Polarized
D) Retroreflective
A) Diffuse
