Solid-State Devices

Question 1

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

Answer 1

A) light/dark operation

Question 1

___ proximity sensors can only detect metals that conduct current.

A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic

Answer 1

C) Inductive

Question 2

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

Answer 2

B) forward / reverse

Question 3

The P side of a PN junction is referred to as the ___.

A) anode
B) cathode

Answer 3

A) anode

Question 4

___ 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

Answer 4

B) Photoelectric

Question 5

___ is the process of converting an AC voltage to a DC voltage.

A) Alternation
B) Conversion
C) Doping
D) Rectification

Answer 5

D) Rectification

Question 6

A ___ has three leads, identified as drain, source, and gate.

A) BJT
B) JFET
C) SCR

Answer 6

B) JFET

Question 7

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

Answer 7

A) hole

Question 8

When the gate pulse is removed from an SCR, the SCR will stop conducting.

A) True
B) False

Answer 8

B) False

Question 9

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

Answer 9

A) capacitive

Question 10

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

Answer 10

C) breakdown

Question 11

A(n) ___ has three leads, identified as anode, cathode, and gate.

A) optocoupler
B) phototransistor
C) SCR

Answer 11

C) SCR

Question 12

___ devices are solid-state sensors that detect the presence of a magnetic field.

A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic

Answer 12

B) Hall effect

Question 13

___ 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

Answer 13

C) Response time

Question 14

The ___ has three leads, identified as gate, main terminal 1, and main terminal 2.

A) diac
B) SCR
C) triac

Answer 14

C) triac

Question 15

The ___ is controlled by current.

A) BJT
B) FET
C) SCR

Answer 15

A) BJT

Question 16

Excess electrons can be added to intrinsic silicon or germanium by adding impurities such as ___, ___, and ___.

A) antimony / arsenic / bismuth
B) boron / gallium / indium

Answer 16

A) antimony / arsenic / bismuth

Question 17

Proximity sensors that detect objects using an electromagnetic field are known as ___ devices.

A) capacitive
B) inductive

Answer 17

B) inductive

Question 18

Zener diodes are designed to operate with a ___ bias voltage.

A) forward
B) reverse

Answer 18

B) reverse

Question 19

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

Answer 19

C) zener

Question 20

A ___ has three leads identified as base, collector, and emitter.

A) BJT
B) JFET
C) Triac

Answer 20

A) BJT

Question 21

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

Answer 21

A) capacitive

Question 22

___ devices are solid-state sensors that detect the presence of a magnetic field.

A) Capacitive
B) Hall effect
C) Inductive
D) Ultrasonic

Answer 22

B) Hall effect

Question 23

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

Answer 23

A) negative / positive

Question 24

Zener voltage remains reasonably constant over a wide range of zener currents.

A) True
B) False

Answer 24

A) True

Question 25

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

Answer 25

A) Diffuse