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JATC Year 3: Motor Control - Mid Term > MC II: Lesson 3 - Solid State Motor Control Pilot Devices > Flashcards

MC II: Lesson 3 - Solid State Motor Control Pilot Devices Flashcards

1
Q

The output signal of a discrete sensor can only be on or off.

True or False

A

True

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2
Q

Discrete mechanical sensors have contacts that open and close. Since discrete electronic sensors often do not have mechanical contacts, the output condition is described as activated or de-activated.

True or False

A

True

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3
Q

Capacitive, inductive and ultrasonic are three types of ______ sensors that are based on the sensor’s operating principles.

a. analog
b. contact
c. photoelectric
d. proximity

A

d. proximity

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4
Q

Since solid-state sensors use semiconductor circuits instead of contacts to switch the attached load, the load must match the voltage and current specifications for the sensor.

True or False

A

True

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5
Q

Sensors that use an NPN transistor to switch DC loads are current-______ devices.

a. sinking
b. sourcing

A

a. sinking

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6
Q

Current-sinking outputs use the ______ side of the DC output circuit as the switch leg to the load device.

a. negative
b. positive

A

a. negative

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7
Q

Sensors that use a PNP transistor to switch DC loads are current- ______ devices.

a. sinking
b. sourcing

A

b. sourcing

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8
Q

Current-sourcing outputs use the ______ side of the DC output circuit as the switch leg to the load device.

a. negative
b. positive

A

b. positive

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9
Q

Identify the NEMA symbol with the correct 3-wire sensor.

A
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10
Q

______ 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

A

b. Photoelectric

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11
Q

Electronic sensors with a(n) ______ output interface can switch AC or DC without the specific polarity requirements for DC circuits.

a. BJT
b. FET
c. Relay
d. SCR

A

c. Relay

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12
Q

A photocell is a photoelectric device that only reacts to ______ light.

a. ambient
b. laser
c. LED
d. sun

A

a. ambient

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13
Q

The component present in a photoelectric device that provides a light source is a ______.

a. receiver
b. transmitter

A

b. transmitter

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14
Q

The component present in a photoelectric device that detects the presence of the light source is a ______.

a. receiver
b. transmitter

A

a. receiver

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15
Q

Response time, sensitivity, operation margin, and light/dark operation are four parameters that are commonly used to describe the operation of ______ devices.

a. contact
b. Hall effect
c. photoelectric
d. proximity

A

c. photoelectric

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16
Q

______ 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

A

c. Response time

17
Q

______ is the threshold value for received light to trigger a change in the output status of a photoelectric device.

a. Light/dark operation
b. Operating margin
c. Response time
d. Sensitivity

A

d. Sensitivity

18
Q

The ratio of the available level of light at a photoelectric sensor’s receiver to the minimum level of light required to trigger the sensor is the ______.

a. light/dark operation
b. operating margin
c. response time
d. sensitivity

A

b. operating margin

19
Q

A ______ operating margin indicates that a sensor will be reliable when ambient light conditions are variable.

a. higher
b. lower

A

a. higher

20
Q

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

a. light/dark operation

21
Q

What is the photoelectric scanning method in which the transmitter and receiver are placed opposite each other?

a. Diffuse
b. Direct
c. Polarized
d. Retroreflective

A

b. Direct

22
Q

What is the photoelectric scanning method in which the transmitter and receiver are housed in the same enclosure and the transmitted beam is reflected back to the receiver from a reflector?

a. Diffuse
b. Direct
c. Polarized
d. Retroreflective

A

d. Retroreflective

23
Q

What is the photoelectric scanning method in which the receiver responds only to the depolarized reflected light from a special reflector or polarized sensitive reflective tape?

a. Diffuse
b. Direct
c. Polarized
d. Retroreflective

A

c. Polarized

24
Q

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

a. Diffuse

25
Q

Proximity sensors that detect objects using an electrostatic field are known as _____ devices.

a. capacitive
b. inductive

A

a. capacitive

26
Q

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

a. capacitive
b. inductive

A

b. inductive

27
Q

______ proximity sensors can only detect metals that conduct current.

a. Capacitive
b. Hall effect
c. Inductive
d. Ultrasonic

A

c. Inductive

28
Q

The size of the object and the type of metal (ferrous or nonferrous) are two factors that determine the effective sensing range of a(n) _____ proximity sensor.

a. capacitive
b. inductive
c. ultrasonic

A

b. inductive

29
Q

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

a. capacitive

30
Q

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
31
Q

What type of proximity sensor emits a high frequency sound signal and detects the reflected sound from the object?

a. Capacitive
b. Inductive
c. Ultrasonic

A

c. Ultrasonic

32
Q

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

a. Capacitive
b. Hall effect
c. Inductive
d. Ultrasonic

A

b. Hall effect

33
Q

A primary step in troubleshooting any of the sensors covered is to determine if the sensor has the correct operating input voltage.

True or False

A

True

34
Q

The sensor in an IEC Standard NPN device must be connected to provide a ______ connection to the load.

a. sinking
b. sourcing

A

a. sinking

35
Q

The IEC Standard PNP device must be connected to provide a ______ connection to the load.

a. sinking
b. sourcing

A

b. sourcing

JATC Year 3: Motor Control - Mid Term (8 decks)

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