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Section 3 Flashcards

1
Q

._____ is the movement of the load by the actuator as it attempts to follow a changing command signal in a motion – control system.

A

tracking

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2
Q

A leadscrew mechanism converts __ ___ motion into __ ___ motion.

A

rotary to linear

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3
Q

List three factors that impede acceleration or deceleration.

A

friction
inertia
gravity

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4
Q

List three devices that are used to enter data into an operator interface device.

A

keyboard terminal

thumb wheels

switch panels

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5
Q

A common application of a _____ is to run a conveyor belt.

A

belt drive

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6
Q

The direction that the housing of a rolling ring drive moves is determined by the_____ .

A

direction rings are pitched

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7
Q

Which of the actuator transmission systems are capable of multiplying rotary speed from the input shaft to the output mechanism?

choose all that apply

A

not belt drive?
JUST Gear box
not rack and pinion

direct drive

leadscrew

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8
Q

The_____ is self-breaking, which enables it to hold a load in a stationary position .

A

worm and wheel

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9
Q

List the five major elements of a closed-loop motion-control system.

A 
Operator interface
Controller
Amplifier
Actuator
Feedback
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10
Q

An inductosyn measures __ __ motion.

A

linear

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11
Q

A hydraulic actuator is a ___ device.

A

linear or rotary

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12
Q

AC drives perform the operation of which element in a motion-control closed-loop system?

Choose all that apply

A

everything but the actuator

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13
Q

The load movement lagging behind the desired movement specified by the command signal is called___.

A

following error

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14
Q

An open-loop configuration considered a servo system

A

is NOT

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15
Q

The direction at which the object being measured moves in relation to the housing of a linear

A

polarity of produced voltage

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16
Q

Convert Gray code number 1000 to an equivalent binary number.

A

to convert from grey to binary
you drop most sigbit and XOR with that bit and next but

1111

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17
Q

The number of degrees per count in an incremental optical encoder is called _____.

A

resolution

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18
Q

Which of the following parameters is measured by a tachometer?

chose all that apply

A

RPM

AND

Direction

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19
Q

A one-track incremental encoder is capable of measuring direction.

A

F

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20
Q

The Wiedemann effect is a _____ action caused by the interaction between two magnetic fields

A

twisting

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21
Q

Which of the following parameters is measured by the optical encoder?

A

all provided answers

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22
Q

Which of the following parameters is measured by a resolver?

A

all answer

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23
Q

An advantage of an absolute optical encoder is that if power is lost and then restored, it is
not necessary to re-establish a reference point.

A

true

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24
Q

wire rope transducer uses _____ to measure velocity

A

tachometer

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25
List two ways an incremental optical encoder can measure velocity.
measuring time interval between pulses | or counting pulses within a time period
26
Where is the rotor positioned over the sections of the receiving board when the angular displacement transducer produces 0 volts?
The rotor is positioned equally across the two sections of AB and CD with an equal area
27
The operation of an inducrosyn is similar to that of a resolver.
TRUE
28
What is the function of the Schmitt trigger in an optical encoder?
convert pulses from phototransistor into sqaure waves
29
Logic circuits that convert binary numbers to gray code, or vice versa, use _____ gates.
XOR
30
The best type of position device to use in conditions where there is extreme heat, humidity, and dirt is the _____ .
NOT pot resolver
31
It is possible to correct an underdamped condition of a position servo by the system gain.
decreasing
32
The characteristics of a servomechanism pertain to the condition of the load when it is moving.
dynamic
33
When equilibrium is reached in a servo system, the error signal becomes zero.
position
34
A current loop in a position-control application has a bandwidth.
HIGH
35
In a closed-loop velocity servosystem with a tachometer, if the load slows the motor down, the error signal (increases, decreases).
increases
36
A bang-bang position servo is used in applications.
hi speed
37
A _____ provides a better braking action in a point-to- point position system.
derivative
38
In the figure What is the purpose of the three exclusive-OR gates?
converting grey code to binary
39
The linear motion-control feedback transducer used by the electrohydraulic system in the Figure is a(n)_____
LVDT
40
Feed-forward the following error signal in a position servosystem.
decreases
41
Another term for speed regulation of a closed-loop velocity control system is _____.
stability
42
In a slow-moving contouring application, the _____ mode provides high stiffness during travel.
NOT derivative integral
43
A position servo has a zero bandwidth.
proporitonal
44
List the four types of static characteristics.
accuracy Response Repeatbiolit Stiffness
45
In Figure 26-8, the LVDT produces a voltage that is the polarity as the output of the D/A converter.
opposite!
46
Indexers perform the operation of which element in a motion-control closed-loop system?
CONTROLLER
47
Which of the following parameters primarily maintain speed regulation?
velociy control
48
In an XYZ system, if two axes movements control horizontal position, which axes controls the vertical position?
Z
49
Linear measurements can also be made by Rotary detectors.
TRUE
50
The actuator of a/an _____-loop system is activated when the command signal or a disturbance occurs.
clsoed
51
A potentiometer is considered a precision measuring device.
true
52
A potentiometer is capable of measuring velocity.
false
53
The _____ of an LVDT is physically attached to the object being measured for position.
iton core
54
5 bit grey code can divide into
32 at 11.25 degrrees
55
The linear velocity transducer produces a voltage that is _____ proportional to the speed of the magnet.
directly
56
Assuming that the system gain of a position servo remains unchanged, the transient response time if the load inertia is decreased.
increase
57
If a master axis slows down on a rewinder paper machine in a master–slave velocity servo, it is likely that the slave axis will
speed up
58
The following error in a contouring position control application is .
minimal
59
List the two ways in which gain adjustments can be made when tuning a servosystem.
potentiamoter or | value picked from software
60
When a setpoint command signal is held constant and the motor that the system is driving is rotating at a steady speed, the _____ amplifier output is zero.
derivative
61
A decelerating braking action called _____ prevents the load in a position servo from overshooting its end point.
damping
62
When input A of the magnitude comparator is less than input B, the motor turns.
CCW
63
A rack-and-pinion transmission system converts __ ___ motion into __ __ motion.
rotary | ;inear
64
lA feedback potentiometer is a linear feedback device.
TRUE
65
The LVDT uses transformer action to measure position
true
66
In the Figure, if the setpoint potentiometer applies +7 V to the summing op amp when the feedback potentiometer applies –12 V to the other summing amplifier input, the rack will move _____
Right

Motion Control (4 decks)

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