Semester Final Flashcards
5 major losses in a motor
- resistance loss
- Core Loss
- Bearing Loss
- Windage loss
- Sound loss
Four primary sources of power losses in the core of an electric motor.
- Eddy Current
- Hysteresis
- Saturation
- Flux Linkage
Three Requirements for Induction
- Relative motion
- A conductor
- a magnetic field
Four Common methods of reduced voltage starting
- Primary Resistor
- Autotransformer
- Part winding
- Wye-delta
The primary difference between single phase and three phase motors is the_____
Start winding
Capacitor Motors are mainly used on ______.
Fairly hard-to-start loads.
3 different types of control utilized in a wound rotor motor
- Drum Switches
- Three pole rheostat
- Silicone controlled Rectifiers
List the Four Limit Switch Actuators
- Lever
- Fork Lever
- Push Roller
- Wobblestick
The Three Basic Parts of an AC Solenoid
- Plunger
- Housing
- Coil
What are Three Basic types of overload relays
- Melting Alloy
- Magnetic
- Bimetallic
What are two types of thermal overload relays
- Melting Alloys
2. Bimetallic strip
Level Devices are commonly referred to as ______ switches.
Float
Magnetic lines of flux surround a conductor as a direct result of the _____ running through the conductor.
Current
The three rules for reading a schematic
- Left to right, top to bottom
- All components are drawn in a deenergized state
- No more than one load per rung
4 Components of an electric circuit
- Source
- Load
- Path
- Switch
List three basic methods that times use to control timing
- Dashpot
- Synchronous
- Solid State (programmable)
The number of closed contact positions per pole
Throw
A number of completely isolated circuits a relay can switch at one time
Pole
The number of separate places on a contact that open or close an electric circuit
Break
The number of separate places on a contact that open or close an electric circuit
Break
What are the four types of timing functions that electronic timers are capable of?
- On-Delay (Timed Closed)
- On-Delay (Timed Open)
- Off-Delay (Timed Closed)
- Off-Delay (Timed Open)
4 types of Hall-Effect sensor actuation
- Hand-on
- Slide-by
- Pendulum
- Vane
List 3 advantages of operational amplifiers
- High Input Impedance
- Low Output Impedance
- High Gain
7 considerations for selecting a scanning method
- Position
- Ambient Light
- Distance
- Size
- Color
- Ambient Air/environment
- Relectivity
Switches that us NEN transistors to switch the output circuit are ______ devices.
Current sinking
Which sensor uses a resistance reading in Ohms to get a temperature reading?
RTD
A____ is a device constructed of two dissimilar metals that generates a small current when one end is heated.
Thermocouple
_____ scan is a scanning technique that uses a special lens to filter the emitter’s beam of light so that it projected on one plane only.
Polarized
_____ scan is a scanning technique that places the transmitter and receiver at equal angles from highly reflective surfaces.
Specular
_____ scan is a scanning technique used in high vibration applications.
Retroreflective
____ scan is a scanning technique generally used in color mark detection.
Diffuse
A ____ sensor is a proximity sensor that detects the proximity of a magnetic field.
Hall
Flow detection sensor operates on the principle of ______.
Thermal conductivity
With a ____ thermistor, an increase in temperature causes the resistance of the thermistor to increase.
PTC (positive temp coefficient)
2 reasons for photocell failure
- contamination
2. Moisture
2 factors that determine the effective range of a capacitive proximity sensor
- physical characteristics
2. Electrical characteristics
A ____ sensor is a proximity sensor that detects conductive materials.
Inductive
Which lead controls or triggers an SCR to conduct?
Gate
3 parts of an AC Driver
- Inverter
- Converter
- DC Bus
5 parts of an SSR
- input circuit
- output circuit
- Control circuit
- optocoupler
- photodiode
- LED
