Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Moco > 2nd half First Semester > Flashcards

2nd half First Semester Flashcards

(78 cards)

Start Studying
1
Q

Mass

A

/32.2

Force due to weight/gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Are polyphase/3 Phase AC motors self starting?

A

Yes, multiple phases spaced 120 degrees

A phase spaced 120 apart from B phase spaced 120 apart from C phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Object

A

Made up of matter, has mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Permanent Split Capacitor

A

1/120-1 HP

Light starting motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Commutator is found in ____ type of AC motor

A

Commutator is in wound motors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does DC motor spin?

A

Interaction of magnetic field of Armature to magnetic field of the field repel and attract causes motor to spin around

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Velocity Formula

A

Displacement/time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

4 Types of Belts

A
  1. Round
  2. Flat
  3. Synchronous
  4. V Belt
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Signal from drive to motor

A

High voltage
High current

+/- 0-180v DC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Worm drive

A

Input shaft will be smaller than output shaft, because less torque on input

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Commutator

A

DC motor

Device that changes polarity on the armature every half rotation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Resistance

A

Opposition of flow of electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Impedance

A

Total resistance to flow in an AC circuit as result of reactance & resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What’s inside VFD?

A

DC rectifier

Filter to clean signal

High speed transistor

Which fabricates a sine wave that’s still DC, allowing us to change frequency

Frequency is what changes speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is Octal used for?

A

Memory addressing

Largest number displayed is 377

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

PWM

A

Pulse Width Modulation fabricates a sine wave with DC power

fooling motor into thinking it’s receiving three phase AC power but it’s DC in pulses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

3 types of Speed

A

Fixed speed
Multiple Speed - like HI, LO, MED
Variable Speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How change direction on 3 Phase motor?

A

Swap 2 phases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

2 parts of AC motors

A
  1. Rotor

2. Stator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Armature

A

Rotating part of the DC motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

PLC

A

Programmable Logic Control
aka All-in-one
Aka brick

Industrialized Microprocessor

Before PLC we had relay logic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Average Velocity

A

=(Vi+VF)/2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Shunt DC Motor

A

1 voltage to armature
Different voltage to field
Less voltage will speed up field, more will slow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

3 steps to PLC

A
  1. Checks inputs
  2. Scans program
  3. Writes outputs
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Universal Motor
1/60–2 HP Hard starting AC or DC, brushes Sewing machines
26
Potential energy
Energy due to position
27
Insulator
Material that has few free electrons
28
Inductance
Property of an electrical circuit that opposes the change in current -current lags behind voltage
29
NEMA Standard for running wires
1-3 are running’s
30
Current
Amount of electrons passing a particular point over a given time
31
Why use brushes on commutator?
Brushes are carbon & will resist wearing down
32
Standard rotation
Spinning counterclockwise from front | Front = opposite of shaft
33
4 # systems
Decimal Binary Hexadecimal Octal
34
NEMA
National electrical manufacturers association
35
Stator
The coil/stationary part, generates a magnetic field in an AC motor
36
Worm gear
Good torque Will be self locking, will only go in 1 direction -little more expensive
37
3 types of V Belts
1. Industrial 2. Agricultural 3. Automotive
38
NEMA Standard for Starting
2-4 are starting
39
Acceleration Formula
Final Velocity (VF) - Initial Velocity (Vi)/ time
40
Control system
Control->Drive->Motor
41
Capacitor Start Capacitor Run | 2 Value Capacitor
2-20 HP | Hard starting motor
42
Synchronous Speed (SS)
Point at which bars are rotating at same speed as magnetic fields are breaking, then slows down & finds speed at which its happy SS = (120•Hz)/# of poles
43
Motor
Device that converts electrical energy into mechanical energy -cars have engines, not motors
44
Shorting bars are found in _____ AC motors
Shorting bars are found in Squirrel Cage AC motor Squirrel Cage includes: Split phase Capacitor Shaded Pole
45
Capacitor Start Induction Run
Light starting motor 1/250-1/4 HP Small, not a torquey motor
46
VFD
Variable Frequency Drive
47
Open loop control
Control system with no feedback to control
48
Feedback card in control
Card counts pulses from encoder, determines frequency of pulses which tells us how fast
49
Single Phase AC motors
Single phase: - synchronous - induction: - wound - squirrel cage: Squirrel Cage: - split phase - shaded pole - capacitor: - capacitor Start induction run - capacitor start capacitor run aka 2 value capacitor - permanent split capacitor
50
3 Phase motor
1/12-200 HP | Hard starting motor
51
Reason we use DC motors
Speed control is extremely simple, speed is controlled through voltage
52
Voltage
Potential difference between two points
53
Commutation
- passing from one state to another | - in DC motors, commutation is done with brushes and commutator
54
Signal from control to drive
Low voltage Low current Analog +/- 0-10v DC, can get speed and direction out of 1 signal
55
Shaded Pole Motor
Small lightweight motor Low Horsepower Will only run in 1 direction Not reversible because of where heavy coil is wrapped around
56
Mnemonics for PLCs
``` LOD OUT SET RSET CNT TIM ```
57
3 types of DC motors
1. Series 2. Shunt 3. Permanent Magnet
58
Centrifical Switch
On starting winding N.C. Switch that once motor gets to 75% of SS, this will open up
59
Induction
When wire passes through magnetic field, it will induce electron flow
60
Starters must have _____
Overload protection to be legally called a starter Overload is what makes it a starter
61
Parts of DC motor
Armature | Field
62
How to get inductance on motor
Using bigger wire on one coil Wire to one coil must have big wire with few coils, wire to other coil smaller skinnier with lots of wraps Thicker wire has more inductance
63
Heaters
Aka Overloads When draw too much current, they get hot and trip
64
What are the 2 signals going from Control-Drive?
1. Enable Signal | 2. Position/speed
65
3 types of AC Motors
Single Phase 3 Phase aka Polyphase Universal
66
Power
Rate at which we do the work in Horsepower
67
IMA’s other name
Velocity Ratio
68
Kinetic Friction
Once we exceed the point of impending motion
69
Rotor
The rotating part of an AC motor
70
Low voltage is __v or less
24v or less
71
Capacitance
Property of an electrical circuit that opposes the change in voltage -voltage lags behind current
72
Field
The horse shoe magnet on DC motor
73
Semi conductor
Some properties of insulator and conductor
74
P.I.D.
Proportional Integral Derivative
75
Turntable encoder
Digital Optical Incremental Encoders
76
Reactance
Opposition of alternating current as a result of either inductance or capacitance
77
Split phase
Medium load starting | 3/4 HP small
78
Conductors inside rotor
Shorting Bars

Moco (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions