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Motor Control II > Motor Control II > Flashcards

Motor Control II Flashcards

1
Q

A ____ is a three terminal, four layer semiconductor, alternating P and N type materials.

A

Silicon Controlled Rectifier (SCR)

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2
Q

The interior barrier voltage for a silicon diode is approximately _________ volt(s).

A

0.6V

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3
Q

A PN Junction in Forward bias has _____ resistance and Reverse bias has _____ resistance?

A

Low / High

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4
Q

A region in a semiconductor in which there is neither an excess of electrons nor holes is known as ________ region?

A

Depletion

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5
Q

The three terminals of the JFET are ___, ___, and ___?

A

Drain / Source / Gate

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6
Q

The three terminals of the BJT are ___, ___, and ___?

A

Collector / Emitter / Base

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7
Q

The addition of impurity atoms into the structure of a semiconductor is known as __________?

A

Doping

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8
Q

A PN junction that operates like a small signal diode in forward direction, but is designed to operate in reverse?

A

Zener Diode

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9
Q

Which semiconductor does current flow during both halves of the AC Cycle?

A

Triac

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10
Q

A ____ is a device formed of either two P type materials and one N type, or Two N type and one P Type.

A

Bi-Polar Junction Transistor (BJT)

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11
Q

A diode produces light is a _____?

A

Light Emitting Diode (LED)

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12
Q

What is a 3 terminal device where the current flows through 2 terminals and is controlled by the 3rd with voltage?

A

Field Effect Transistor (FET)

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13
Q

What is a 3 terminal device where the current flows through 2 terminals and is controlled by the 3rd with Current?

A

Bi-Polar Junction Transistor (BJT)

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14
Q

The process of passing an AC voltage through a diode results in a _____ DC voltage?

A

Pulsating

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15
Q

A diode that is switched on and off by light is a ____?

A

Photodiode

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16
Q

_____ is used to transfer a signal between two electrically isolated circuits.

A

Optocoupler

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17
Q

What detects the presence of an object when it comes within a specific distance of the sensor’s electrostatic field generated by a capacitor at the end?

A

Capacitive Proximity Sensor

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18
Q

SSR Switching method ______ turns the load on when the sine wave crosses the zero axis.

A

Zero Switching

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19
Q

What is a scanning method where the receiver and transmitter are housed in the same enclosure, and the transmitted beam is reflected back to the receiver off a polarized reflector?

A

Polarized Scan

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20
Q

A ______ is a configurable solid state device with relay inputs and outputs. Similar to a PLC, but without the need for expensive software, and limited uses, and functions.

A

Programmable Logic Relay

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21
Q

What is a scanning method where the receiver and transmitter are housed in the same enclosure, and the transmitted beam is reflected back to the receiver off the target?

A

Diffuse Scan

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22
Q

Solid state devices have moving parts. T/F?

A

False

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23
Q

SSR Switching method ______ turns the load on when the load voltage is at Peak.

A

Peak Switching Method

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24
Q

What device is used to limit current extremely fast (about 2 msec)

A

Semiconductor Fuses

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25
Q

What is a scanning method where the receiver and transmitter are housed in the same enclosure, and the transmitted beam is reflected back to the receiver off a reflector?

A

Retroflective Scan

26
Q

Solid State Relay’s A1 and A2 are called ______ rather than the “Coil”, which is used in electromechanical relays.

A

Inputs

27
Q

SSR Switching method ______ turns the load on immediately after control voltage is present.

A

Instant On

28
Q

What protects Solid State devices from Voltage Spikes by shunting current.

A

Metal-Oxide Varistor’s (MOV)

29
Q

What detects the presence of an object using emitting a high frequency sound signal and detecting its reflection back to the sensor?

A

Ultrasonic Proximity Sensor

30
Q

What is a scanning method with a transmitter and receiver opposite each other?

A

Direct Scan

31
Q

What is the technique used to link SSR inputs and outputs?

A

Optoisolation

32
Q

What detects the presence of an object when it comes within a specific distance of the sensor’s high frequency electromagnetic field?

A

Inductive Proximity Sensor

33
Q

When installing, operating, or maintaining an MCC, an electrical worker should use_______

A

Manufacturer’s Manual

34
Q

A Drawout unit of an MCC is typically referred to as a _____.

A

Bucket

35
Q

The fault current is determined by the ______rated device withing the MCC

A

Lowest

36
Q

Coating the copper bus in an MCC with ___ protects it from corrosion.

A

Tin

37
Q

Inspect all cables for tight connections is a part of the Semi-Annual Maintenance of an MCC. T/F

A

False (It is part of the Annual Maintenance)

38
Q

Performing a Meggohm Meter test of all Motors is a part of the Annual Maintenance of an MCC. T/F

A

False

39
Q

______starters apply a low voltage to the motor at startup, and when the motor is at its running speed, a higher voltage is applied.

A

Reduced Voltage

40
Q

Reduced voltage starting for DC motors can be accomplished by _____ or solid state starter.

A

Rheostat

41
Q

Large current fluctiations result in ____, poor voltage regulation and harmonic issues on power systems.

A

Voltage Drops

42
Q

Solid state starters use ____ to control the voltage and current to the motor.

A

SCR’s

43
Q

____ are used to offer greater control of the starting and stopping of motors.

A

Soft Starters

44
Q

The most common timing functions are On-Delay, Off-Delay, ______, and Repeat Cycle.

A

One-Shot

45
Q

The Off-Delay timer is activated by the use of _____ signal.

A

Trigger

46
Q

What timer uses equal on/off time periods?

A

Symmetrical

47
Q

What timer uses unequal on/off time periods (each are selectable)?

A

Asymmetrical

48
Q

A _____ timer maintains its current accumulated time value after power is removed, while _____ does not.

A

Retentive / Non-retentive

49
Q

Mechanical Latching relays are made with two types of coils, _____ and _____.

A

Latch / Unlatch

50
Q

Phase Sequence Relays monitor three-phase input for lost phase, or too high or low _____ level.

A

Voltage

51
Q

Frequency Relays monitor three phase voltage for change of frequency T/F?

A

False (single phase)

52
Q

The most commonly used Voltage Sensors are Overvoltage, Undervoltage and _____ relays.

A

Voltage Band

53
Q

When the resistance is removed from a Wound Rotor the rotor windings are shorted together, and the motor is at full speed.

A

True

54
Q

What controls the power to the motor by changing the firing angle of the AC sine wave?

A

Thyristor (SCR)

55
Q

What braking method injects DC current into two of the three windings of the motor?

A

Injection

56
Q

What braking method injects motor flux into all three phases?

A

Flux

57
Q

What braking method sends excess energy to an external resistor?

A

Dynamic

58
Q

What braking method sends excess energy back to the AC supply?

A

Regenerative

59
Q

When troubleshooting a VFD the phase to phase voltage should be within ____ of the specified level.

A

2%

60
Q

When troubleshooting a VFD the phase to phase FLC should be within ____ of the nameplate value.

A

10%

Motor Control II (1 decks)

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