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Motion Control > SECTION 2 Test > Flashcards

SECTION 2 Test Flashcards

1
Q

The longer time duration that a steady – state exists, the ________the integral action becomes.

A

greater

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2
Q

A system that oscillates is referred to as being ______

A

unstable

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3
Q

The term duty cycle refers to the amount of time a signal is ______ compared to the period of one complete cycle

A

on

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4
Q

By ______ the on – off differential gap, in the cycle time is lengthened.

A

increasing

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5
Q

The output of the derivative function [a] the output of the proportional output when the error signal is getting larger.

A

?

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6
Q

The magnitude of the integral output is proportional to the _____

A

all provided answers

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7
Q

In a PID system, after the derivative function is completed and proportional signal is ineffective the integral function is performed.

A

TRUE

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8
Q

Which section of the closed – loop system performs the four control modes?

A

?

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9
Q

List which type of operational amplifier performs the following PID mode options:

proportional
integral
derivative

A

?

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10
Q

A setpoint change can also produce offset.

T/F

A

TRUE

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11
Q

For a DC variable-speed drive to cause the motor to provide a constant horsepower to the load, it varies the motor’s____ to run it between zero RPM and a base speed, and it varies the ____ to run the motor above the base speed.

options are field strength and arm voltage

A

arm voltage

field strength

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12
Q

Referring to figure 8-7, if the motor speed slows down, the IR voltage at R11 (increase/decrease), causing the SCR’s to fire (sooner/later) in the alternation.

A

increase

sooner

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13
Q

The Armature is the primary part of the motor where an adjustable voltage is connected for speed control.

T/F

A

True

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14
Q

As the motor runs at base speed, the voltage applied to the Armature infield is_____ .

low
moderate
maximum

A

max

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15
Q

The function of Q1 in figure 8-4 is

A

variable resistance

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16
Q

To provide variable torque to a load, the DC variable-speed drive causes the speed of the motor to ___________ when an increase in torque is required.

A

increase

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17
Q

Match the application example with the appropriate motor load classification.

machine tool lathe

pump

hoist

centrifugal fan

extruder

A

?

18
Q

Which of the following types of circuits are used by the drive controller section?

All provided answers
Regulation
Protection
AC-to-DC converter

A

all proided

19
Q

By adjusting the DC drive so that the field current is reduced to half, the motor speed _____ .

stays the same

cut off

doubles

A

doubles

20
Q

Which of the following motor functions can be manipulated by the operator control section?

Starting
Speed
Change of direction
Stopping
All provided answers
A

all

21
Q

A variable-frequency drive supplies current directly to the _____.

stator
rotor

A

either stator or answer is both

22
Q

The semiconductor switching device that is used in the inverter section of a PWM drive is the.

bipolar transistor
SCR
IGBT
A

IGBT

23
Q

The __ oop of the AC closed-loop vector drive provides position information.

A

Outer

24
Q

By using the programming capabilities of some variable speed drives, it is possible to undersize the .

All provided answers
drive
motor

A

either drive or all provided answer

25
Q

AC drives cause the speed of an AC induction motor to change by.

changing the number of poles
varying the armature current
varying the bus voltage
varying the applied frequency

A

applied freq

26
Q

Match the following names of the VFD sections with the appropriate circuit function that they perform
inverter

converter

intermediate circuit

A

converts into simulated sine wave

rectifes AC into pulsing DC

Filters pulsating

27
Q

Name A method of producing the feed back signal for the following control loops in a vector drive.

Speed feedback

Current feedback

A

?

28
Q

The auto boost circuit is used to help accelerate an AC motor when it is starting or running at a low speed.

T/F

A

TRUE

29
Q

One common method of slowing the speed of an AC motor is to reduce the applied voltage.

T/F

A

False

30
Q

The control function of an AC drive is used for stopping the load quickly.
braking
deceleration
speed

A

deceleration

31
Q

Separation occurs when a mixture is

cooled
heated
both

A

either both or cooled

32
Q

The value for a standard transmission current signal is _____ when it is zero during calibration.

A

4 ma

33
Q

In some applications, ingredients can be mixed in a shorter amount of time by

A

increaseing

34
Q

_____ Thermal energy is supplied to heat exchangers

both answers
Cold
Hot

A

both

35
Q

Which of the following statements describes the control requirements that must be achieved to ensure product quality?

Quantity of raw materials
Controlling the process variable during the reaction cycle
All provided answers
Controlling each step of the sequence
A

all provided

36
Q

The two functions of a are to convert the output of a _______sensor into a standardized signal and to send a signal to a distant location.

A

transmitter

37
Q

The purpose of a square root extractor is to___ .

Linearize a signal.
Multiply the magnitude of a signal
remove noise from the signal
A

multiply magnitude or

linearize a signal

38
Q

A I/P transducer converts ___ to ___

A

current to pressure

39
Q

The boiling point of a liquid can be increased if the pressure of the container in which it is heated is

All provided answers
Inverted
decreased
Increased

A

increased

40
Q

The characteristics of a sensor refers to the time at which its output reaches a steady state after a signal is applied to the input.

static or dynamic

A

dynamic

Motion Control (4 decks)

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