Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
119 Cards in this Set
- Front
- Back
|
A/D stands for? |
Analog to Digital |
|
|
D/A stands for? |
Digital to Analog |
|
|
Simultaneous A/D converter compares? |
Analog input voltage to a reference voltage with many comparators and an encoder |
|
|
Stairstep A/D converter compares? |
Output to D/A converter using up counter and one comparator |
|
|
Tracking A/D uses? |
Up/down counter and one comparator |
|
|
Binary weighted D/A converter uses? |
Different values of resistors (Disadvantage) |
|
|
Ladder (R/2R) uses? |
2 resistors of different values |
|
|
Selector data chooses? |
One of several inputs for an output |
|
|
Distributor data circuit chooses? |
One of several outputs for one input |
|
|
Multiplexing |
Accomplished by placing all inputs to a single output line (used in data selector) |
|
|
Multiplexing is the process of? |
Adressing each input during one clockpulse |
|
|
Demultiplexing |
Process of separating data from a single line to different outputs |
|
|
A=? B=? C=? D=? |
A=00 B=01 C=10 D=11 |
|
|
Data selector has how many inputs and outputs? |
7 inputs and 1 output |
|
|
A1 and A2 compose what? |
The adress |
|
|
Rpm and Cemf are _____ proportional |
Directly |
|
|
When Rpm and Cemf are up |
Torque, power, and load are down |
|
|
Rpm is another name for |
Speed |
|
|
A rotating Machine is |
Any device that has a spinning or rotating shaft and uses mostly electricity as input or output. |
|
|
Rotating machinery is divided into what two general categories? |
Motors and generators |
|
|
Motors have what input and what output? |
Electrical input and mechanical output |
|
|
Incremental motor |
Shaft rotates a specific distance in degrees depending on electrical input |
|
|
Continuous motor |
Shaft rotates all the time |
|
|
Speed is... |
The rotation of the shaft and is measured in Rpms or Rps |
|
|
Torque is... |
The twisting force that causes the shaft to rotate |
|
|
Torque is measured in _______ and is max in_______ |
Ft x Lbs, Newton meters, or the product of field current and armature current. It is max in locked condition. |
|
|
Two basic components of motors are? |
Poles and armature |
|
|
It is an electromagnet if it is? |
An inductor |
|
|
What are the 3 types of DC motors? |
Shunt, Series, and Compound |
|
|
What are the 2 types of DC compound motors? |
Long and short shunt |
|
|
CEMF is inversly proportional to ______ and opposes? |
Torque and opposes armature voltage |
|
|
Starting current of a series field motor is higher than that of a? |
Shunt field motor |
|
|
IA and IF have the same voltage drop for field coil and armature |
They equal EA |
|
|
A compound motor has a higher starting torque than a shunt motor and a lower starting torque than a ________ |
Series motor |
|
|
Opposing series and shunt fields causes? |
DC compound motor to lose armature mag field |
|
|
Adding series and shunt fields causes? |
DC compound motor to gain armature |
|
|
The two types of controllers are? |
PWM and AM (time and amplitude) |
|
|
Duty cycle of a pulse train is? |
The ratio of "ON" time to the total cycle |
|
|
DC motor responds to... |
The average DC voltage applied |
|
|
Human controlled feedback utilizes |
A person making decisions |
|
|
A loaded DC motor needs High positive to maintain_____ |
RPM |
|
|
Loaded circuit = ? |
Higher torque |
|
|
Control signal goes to the? |
Control circuit |
|
|
When troubleshooting begin with what? |
Begin with a macroscopic approach and work your way down |
|
|
The first step in troubleshooting is? |
Recognize problem |
|
|
The second step in troubleshooting is? |
Eliminate human error |
|
|
If motor runs and no signal is detected at the input then... |
The circuitry is bad |
|
|
Closed loop feedback utilizes motor output to create... |
Control signals |
|
|
To isolate controlling circuit you have to |
Check input and output |
|
|
Large starting torque in a DC motor requires... |
Large starting current |
|
|
2 types of DC motor control are? |
Time and amplitude control |
|
|
Digital Motor controller (D/A converter) converts... |
A digital signal into its analog equivalent |
|
|
What is undesirable and controlled in a DC motor? |
Large currents |
|
|
What determines manual from auto |
A manual switch |
|
|
Motion: |
A change of position of an object per time |
|
|
Fixed velocity is a constant velocity where? |
Between each point |
|
|
When measuring RPM what is unimportant? |
The distance between sensing edges |
|
|
Velocity of a point on a rotating disk is not affected by what? |
The number of sensor makers of a disk |
|
|
Electrical differentiator circuit will sense changing voltage and disregard... |
Absolute values |
|
|
The TS process includes.... |
Assessment, ID, and repair |
|
|
What is the best method of localizing a fault? |
Signal tracing |
|
|
Localization determines... |
The faulty stage |
|
|
Isolation determines... |
The faulty component |
|
|
Localization requires... |
Signal tracing or signal injection |
|
|
What is the function generator used for? |
Signal injection |
|
|
Use function generator or signal generator for? |
A path that is too low |
|
|
Signal injected is used to? |
Detect speed |
|
|
The square wave from the speed detector changes voltage by the? |
F/V controller |
|
|
For closed loop effect the output has the same effect as the... |
Input |
|
|
The position is the... |
Location of an object |
|
|
Prime movers are also known as... |
Position generators |
|
|
Power is the force that turns a shaft times the distance that the... |
Shaft moves |
|
|
The set point is... |
The optimum operating parameter or reference |
|
|
Proportional control uses... |
Adjustable gain as the means to increase the rise time and manage error signal |
|
|
PD control reduces... |
Overshoot but doesn't aid in reaching set point value |
|
|
PI control allows... |
Set point value to be reached but rise time is degraded |
|
|
PID uses... |
A band-pass or band reject filter. It has a fast rise time and low overshoot |
|
|
AC induction motors are... |
Continuous rotating machines requiring current as ouptut |
|
|
AC motors are most popular because |
AC power is readily available |
|
|
Stator magnetic field generates... |
Rotor current in a AC induction motor |
|
|
Slip speed equals... |
Field RPM - Shaft RPM it is the difference between the two) |
|
|
Stator field is also know as... |
Synchronious |
|
|
Shaft speed is also know as... |
Rotor rotational speed |
|
|
All generators and rotating machinery operate on... |
Magnetism |
|
|
The principles of magnetism... |
Motors operate on attraction and repulsion. Generators operate on passing a conductor through a magnetic field producing voltage. Generators power it's own stator windings. |
|
|
AC generator is also know as... |
An alternator |
|
|
AC generators need _________ and _________ to operate... |
Sinusoidal waveform and AC current |
|
|
AC inductions motor operates on |
Induction |
|
|
Synchronious AC motor operates on... |
Principle of induction |
|
|
Stator field RPM= |
Slip speed + Shaft RPM |
|
|
AC motors are described as... |
1,2, or 3 phase motors |
|
|
Stator field is equal to |
Synchronous speed |
|
|
When load increases then RPM |
Decreases |
|
|
The purpose of a synchro is... |
To transfer angular info in the form of voltage |
|
|
The two basic components of synchros are... |
Stator and Rotor |
|
|
A rotor is a... |
Rotatable winding |
|
|
The 2 classes of synchros are... |
Control and torque |
|
|
Torque differential transmitter provides... |
Rotational correction to torque receiver |
|
|
Control System provides... |
The drive signal for a servo system |
|
|
When synchronized the output from a control transformer is... |
Out of phase |
|
|
How does transolver differ from a transformer? |
It has additional rotor winding |
|
|
Positional derived by mechanical coupling to the... |
CT |
|
|
There are ___ steps to TS synchros |
FOUR |
|
|
The first step in TS is to... |
Duplicate the symptom |
|
|
The most important step in TS is... |
Removing the power |
|
|
In order to isolate the components |
Flip switches, Disconnect cables,and desolder |
|
|
Ohmeters measure... |
Resistance |
|
|
What is affected in a shorted state |
All devices |
|
|
Gyroscopes have two basic properties |
Rigidity and precision |
|
|
For rigidity if no force is applied |
The axis remains in fixed direction |
|
|
For the precession mode the axis turns right at |
90 degrees |
|
|
The factors that determine rigidity |
Rotor weight, speed and shape |
|
|
Precession provides basis for |
Rate-gyro |
|
|
Rate gyro consists of a |
Spinning rotor in single gimbal |
|
|
Accelerometer operation is based on |
Inertia |
|
|
A free gyro is... |
2 gimbals in a universally mounted gyro |
|
|
Navigation systems primarily use... |
Accelerometers |
|
|
Pulse accelerometer is designed to provide output signal in______ form |
Digital |
|
|
The purpose of annerection is to |
Maintain vertical or horizontal |
