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159 Cards in this Set

  • Front
  • Back

Relay Motor controllers perform what key function?

High Circuit Isolation

The following circuit is nothing more than a ____________

The following circuit is nothing more than a ____________

Emitter follower circuit

The current to the motor is amplified by the _____________

Driver

A loaded DC motor produces __________

Less CEMF

How is acceleration or deceleration symbolized?

a

When plotting velocity and distance traveled, what would the graph look like for a fixed velocity over time?

Straight line increasing over time

What is not a popular motion sensor used in industry?

Photo Induction

In measuring RPM on a spinning shaft, the distance between the sensing edge is ___________


Unimportant

A closed loop motor system regulates motor speed by ______________

Comparing feedback information with a base speed

What is the force that turns the shaft of a Prime Mover called?

Torque

In a PID controller the D stands for ________

Derivate

The output of the proportional control signal is the input to the ________

Summing amplifier

A PID controller is operating properly when the output of he PID circuitry has a/an _______ and reaches the set point value.

Constant DC level, PWM and controller output


The PID controller input is the error signal from the __________

Window Decoder

The __________ control reaches the set point value but degrades rise time

PI

With a PID control system, if the process variable changes due to the loading or unloading condition, the motor will __________

Be regulated back to the set point value

A closed loop motor system regulates motor speed by ____________

Comparing feedback information with a base speed

What type of digital position sensor uses four sensors?

Code

Which is usually undesirable and is also controlled in a DC motor?

Large currents

The series and parallel starters change ______, _________, ________________.

Resistance, current to the motor, and voltage applied to the motor

What are the major components of a feedback system?

Driver, PWM, Motor, and Voltage Source

The current to a motor is amplified by the __________

Driver

The relationship between voltage and speed of the motor is that as voltage increases, speed ___________

Increases

As the load is increased on a motor, current __________

Increases

An electronic feedback system utilizes a ___________ in place of a human operator.

Comparator

What types of feedback are used in closed loop motor systems to regulate speed?

Source current, CEMF and External RPM sensors

What factors would affect a motor's speed, if a closed loop feedback system were not implimented?

Physical loading temp, source voltage

What is the weight that one horsepower can lift one foot in one second?

550

The __________ is the actual operating parameter or actual measured value.

Process variable

Stabilization is reached as the ________ reduces the overshoot of the signal.

Derivative control mode

What is the condition which indicates that the values of a circuit have settled and tend to remain constant?

Steady-state

Which control system provides a fast rise time, minimal overshoot, and quick response to outside influences?

PID

In a PID controller, the D stands for _________


Derivative

With a PID controller, integral action takes place anytime there is a deviation between the _____________ and process variable.

Set point

What does the "P" in PID stand for?

Proportional

What does the "I" in PID stand for?

Integer

If the input to the controlling circuitry is bad and the motor is producing an output, what is the valid problem?

Sensing Circuitry Malfunction

What can a technician do to troubleshoot a signal path with a signal that is too low for an oscilliscope to read?

Inject a signal with a function or signal generator.

How many complete stator cycles does it take to produce one complete revolution of a stepper rotor that has a step of 9 degrees?

10

What causes a torque up - torque down action?

One phase energized sequence

What disadvantage does a stepper motor have with two stator coils energized at once?

Twice the current is drawn from the power supply

What is the primary difference between a 1¢ and 2¢ full step generator?

Input data signal "ON" duration

How are BLDC motors characteristically different from their conventional permanent magnet DC motor counterparts?

The BLDC is used in applications that require smaller dimensions.

What part is used in AC motors only?

Squirrel cage

What induces current in the rotor of an induction motor?

Stator magnetic field

What induces a rotor magnetic field in an induction motor?

Rotor current

What level of voltage is produced in an AC generator when the armature movement is perpendicular to the strator field?

Maximum

In a revolving field AC generator, DC from a seperate source is passed through the __________ via the slip rings and brushes.

Field windings on the rotor

To isolate the controlling circuitry, one must check the output from the circuit and the ________

Input to the circuit

Human error in troubleshooting could be related to _________, _________, ___________,

Input signals, motor parameters, equipment setup

Localization is used to __________

Determine which stage or section contains the fault

The process of determining the bad component in a particular stage or section as _________

Isolation

During signal injection, the generated signal should _________

Be as small as possible to prevent circuit damage

The square wave signal from the speed detector is changed to a voltage by the ___________

F/V Converter

In most cases, system fault localization will require either __________ or ___________ to narrow the problem to a specific circuit or stage

Signal tracing, signal injection

A system block diagram will help a troubleshooter seperate the system into _________

Stages

What is the term used to describe the number of degrees that a stepper motor rotates for each input pulse?

Step

If a stepper mode operates in the step mode but does not operate in the run mode, what is the probable faulted area?

Oscillator circuit

Given the following stepper motor with a coil activation sequence of QA → QD. What direction will the rotor rotate?

Given the following stepper motor with a coil activation sequence of QA → QD. What direction will the rotor rotate?

Clockwise

A two phase full step generator is __________ to a single phase generator

Nearly identical

What is the following circuit called?

What is the following circuit called?

Ramp up - Ramp down

What the relationship of torque to acceleration?

Directly proportional

What is the basic purpose of a photodiode array of an optical sensor?

Convert light to data

What principle of magnetism do motors operate on?

Attraction and repulsion

In a delta connected alternator, the line voltage equals the ____________

Phase voltage

A closed loop feedback system utilizes motor output to create a __________

Control signal

Which component is faulty if the input to the motor checks out fine and the motor does not run?

Bad motor

What term is used to describe the highest PPS that a stepper motor can use?

SR

Which circuit in a stepper motor system develops the power necessary to energize the stators?

Driver

Why is the BLDC easier to examine and repair than a conventional DC motor?

The electric windings do not rotate.

A device that has a spinning shaft and uses electricity as the input or output is called ___________

Rotating machinery

How does an incremental motor operate?

The shaft rotates a specific distance for each input

What type of power is produced by a generator?

AC or DC

What term is used to describe speed in a motor or generator?

RPM

What best describes torque?

A twisting action

CEMF and speed are ______

Proportional

One horsepower is the power rate according to _____________

33,000 ft-lb/min

Electrical power is defined in terms of ___________

Watts

What principal of magnetism do motors operate on?

Attraction and repulsion

What principal of magnetism allows a generator to power its own stator windings and still generate an output voltage?

Retentivity

What is the primary difference between a DC motor and a DC generator?

The power to the rotor is replaced in a generator with a load.

A DC motor operates using what?

Direct Current, DC Voltage, The principal that electric energy produces mechanical energy.

How many types of compound motors are there?

2

When a schematic diagram shows a field coil, you instantly know that the motor is what type?

Electromagnet

Where is the shunt field coil placed in parallel with a series field motor in a schematic?

There is not shunt field coil in series field motor

In a shunt field motor, output power is equal to __________

Speed x torque x (0.1047)

How is CEMF related to torque?

Inversely proportional

If motor speed increases but the applied voltage remains constant, the only thing unaffected is ____________

Field current

In a series motor, how many paths are there for a current?

1

Starting current of a DC series field motor is ________ than an equivalent DC shunt field motor.

Higher

If a series field motor is loaded, what happens to the electrical input power?

Remains the same

Opposing series and shunt fields cause a DC compound motor to __________

Lose armature magnetic field

Which type of compound motor is common in small DC motors?

Short shunt

Which type of compound motor is pictured?

Which type of compound motor is pictured?

Long shunt

PWM stands for __________

Pulse width modulation

Sinusoids are generally examined by the conduction angle and the ____________

Firing angle

The instant a signal turns "ON" is determined by the _____________

Firing angle

By controlling the firing angle, the _________, ____________, __________ is also effected

RPM of the motor, average voltage, conduction angle

What signal is the output of a pulse width modulator?

Varying width pulse

What determines the period (or time) between output pulses?

Input clock pulses or triggers

The ____________ determines the width of the pulse width modulated signal.

Amplitude of the DC input.

In the experiment, when the motor speed control is increased from 30 to 40, the positive pulse ___________

Increased in length

Synchronous speed is the same as ___________

Stator field speed

During disassembly, which part of the motor is most fragile and easily damaged?

Stator windings

An overloaded motor will most likely display which symptom?

Overheated

An open stator will usually cause what?

Failure to start

The megger is used for testing _______ and the clamp on meter is used for ____________

Insulation deterioration, stator current

What is a common frequency of the ac supply voltage to a synchro system?

60

What is a common phase of the AC supply voltage to a synchro system?

Single

In a torque synchro system, which component has a rotor with rotational position driven by electrical voltage and phase?

TR

What is the biggest difference between torque systems components and control synchro systems components?

Current requirements

Which system component is most like a torque receiver?

Control transformer

The term ____________ means, the axis of rotation of the gyro wheel tends to remain in a fixed direction in space if no forces are applied.

Rigidity

What stabalized platform is mostly mechanical and is susceptible to errors?

Gimbalized INS

What stabalized platform requires up to 4 hours to allign?

Gimbalized INS

The AC induction motor uses what type of motor?

Squirrel cage

Slip speed is __________

The difference between stator field RPM and shaft RPM

An AC motor is typically described as a one, two, or three _________ motor.

Phase

Strator field rotation is also called _______

Synchronous speed

What is slipspeed?

Synchronous speed - shaft speed

Given the following circuit, what type of motor is this?

Given the following circuit, what type of motor is this?

Split inductive motor

Given the following circuit, what type of motor is it?

Given the following circuit, what type of motor is it?

Split capacitive start motor

Always _________ and tag out the circuit prior to performing any maintenance on electrical wiring, motors or loads.

De-energize

What troubleshooting stage allows the technician to locate the most difficult and hidden problems of a motor?

Performance test

What defect is normally found when measuring air gap?

Bearing wear

What type of connection is shown?

What type of connection is shown?

WYE

How many wires are used for a 3, WYE alternator?

4

Two basic components of a synchro are the stator and the ___________

Rotor

The purpose of a synchro system is to transfer ______________

Angular information

A CT synchro is a control _________

Transolver

The mechanical movement of a synchro produces a voltage that represents ____________

Angular information

What is the function of the torque differential transmitter?

Provides rotational correction to the torque receiver

While flying on a heading of 110°, another aircraft is detected on a heading of 120° How much correction is applied to the radar tracking by the torque differential transmitter in this situation?

10°

The torque differential transmitter always adjusts a synchro system according to ___________

The current compass heading

What is the symbol for a control differential transmitter?

CDX

What is this?

What is this?

A control transformer

What is the symptom of a shorted receiver stator winding?

The receiver rotor locks up on the good windings

When troubleshooting a synchro system, how is a multimeter used?

Measuring resistance

A shorted stator winding on a transmitter affects what devices?

Single receiver, transformer

What gyro property causes the gyro to remain in a fixed position?

Rigidity

What factors determine the rigidity of a gyro?

Rotor speed, rotor weight and rotor shape

What gyro characteristically provides the basis of the operation of a rate gyro

Precession

What type of accelerometer is designed to provide an output signal in digital form?

Pulse

What does an AC motor need as an electrical input signal?

Sinusoidal waveform, alternating current (AC)

What type of AC motor is used for large horse power or special applications?

Synchronous

The three stages of AC motor troubleshooting process are ____________

Visual inspection, operational check, performance test

What defect is normally found when measuring air gaps?

Bearing wear

What type of 3 connection can also power single phase appliances?

WYE

How many wires are used for a 3, WYE alternator?

4

How many stator windings does this synchro have?

How many stator windings does this synchro have?

3

The two classifications of synchros are control synchros and _________________

Torque synchros

(T/F) A torque differential transmitter must be used on every synchro system.

False

What is the function of the torque differential transmitter?

Provides rotational correction to the torque receiver

The torque differential transmitter always adjusts a synchro system according to ___________

The current compass reading

What is this?

What is this?

Torque differential transmitter

When synchronized, what is the output from a control transformer?

Out of phase

Which device in the control synchro system performs the same function as the torque transmitter?

Control transmitter

The fuse is open that supplies power to the synchro system. What is the most likely defect in the system?

Shorted rotor

How are components isolated for troubleshooting in a synchro system?

Flipping switches, disconnecting cables, and desoldering