Chap 17 -27
Hall voltage varies depending on how close the magnet is to the whole generator, which acts as a _______ signal
Analog
The operation of a thermistor is based on the ___________ hole theory
Electron
_________ and contamination are the primary causes a photocell failure
Humidity
_______ Is the property of matter by which of mass persists in its state of rest or motion until acted upon by an external force
Inertia
A photoconductive cell is a device that conducts current when energized by
Light
Hall effect of sensors are also used to replace mechanical ______ switches and applications that require the detection of an objects position
Limit
In auto transformer starting, the motor terminal voltage does not depend on the ______ current
Load
_________ Current and the resulting torque produced in the motor shaft in addition to load requirements determine whether the motor can be connected across the line or whether the current must be reduced through reduce the voltage starting
Locked rotor
Friction brakes are normally controlled by a____________, which activates the brake shoes
Solenoid
______ time Is the time it takes a programmable controller to make a sweep of the program
Scan
______ I/O's are the most common inputs and outputs
Discrete
Without light, the _______ of the photo diode is high
Resistance
To aid and interfacing and monitoring a programmable-based system, a ______ Port is used for monitoring and programming a system using a computer
Serial
A flow detection sensor is a sensor that detects the movement of liquid or gas using a
Solid-state device
A flow detection sensor operates on the principle of ________ conductivity
Thermal
A voltage output pressure sensor typically outputs 0 VDC to ___ VDC proportional to the rating of the pressure sensor
10
A current output pressure sensor typically output is 4mA to _____ mA proportional to the rating of the pressure sensor
20
The high-frequency sound waves of them ultrasonic sensor are typically in the ______ kilohertz range
200
The majority of industrial applications normally use ________ motors
3o/ induction
Standard primary resistor starters provide two point acceleration with approximately ____ of the line voltage at the motor terminals at the instant of motor starting
70%
A motor cannot be used for plugging if it cannot be reversed _________
At full speed
The main advantage of programmable _______________ is that they combined the latest technologies, programming methods, and communication networks of PCs with the latest technologies of PLCs
Automation controller's
The motor stator windings must be divided into two or more equal parts for a motor to be started using part winding starting
Stator
Auto transformer starting uses an _____ 3o/ auto transformer to provide an reduced voltage starting
Tapped
A thermistor is a ________ sensitive resistor
Temperature
The first programmable controllers were developed to eliminate individual control relays and _______ by consolidating them into one unit that could be programmed and re-programmed as required by the application
Timers
_______________ Should always be used on electrical breaking circuits
Total interlocking
Care must be taken when using the ________ command because it overrides all safety features design for the program
Force
Extreme caution must be used at any time a programmable controller's ________ lamp is energized
Forced I/O
Electro mechanical ________ brakes are often use along with dynamic braking in applications that require the load to be held
Friction
________ Starting is the least expensive and most efficient means of starting a motor for applications involving small horsepower motors
Full voltage
A __________ sensor detects the proximity of the magnetic field
Hall effect
Generally, any material with a __________ constant greater than 1.2 may be detected
Dielectric
___________ Mode is a method of ultrasonic sensor operation in which the emitter and receiver are placed opposite of each other so that the sound waves from the emitter are received directly to the receiver
Direct
A _____ bit is the controlled contact or output that changes from open or closed ON to OFF after the present time or number of accounts has been reached
Done
____________ Fuses are normally required when using part whining starting
Dual element
__________ braking is a method of motor breaking in which a motor is reconnected to act as a generator immediately after it is turned off
Dynamic
Inductive proximity sensors operate on the _____________ principle
Eddy current killed oscillator
A proximity sensor is a solid-state sensor that detects the presence of an object by means of a _________ sensing field
Electronic
________ Actuation is an active method of hall affect sensor activation in which a magnet is oriented perpendicular to the surface of the sensor and is usually centered over the point of maximum sensitivity
Head on
A programmable controller's power supply may provide power for the _____modules
I/O
Most hardware problems are found in the ____ sections of the controller and usually can be found using standard DMM's
I/O
Friction brakes normally consist of two friction services (shoes or pads) that come in contact with a rotor (wheel) mounted on
Motor shaft
Voltage and current readings are taken when troubleshooting _______ circuits
Power
A programmable controller's_________ Lamp should normally be energized
Power
______ processing blend Sequential, step-by-step functions with continuous close the loop control
Batch
The ________ circuit includes the motor starter mechanical or solid-state overload contacts and timing circuit
Control
Because there is a small delay usually less than 30 seconds before a flow detection sensor heats enough to signal no flow, the sensor acts like a ________________, which allows for a short time delay to pass before signaling a problem
Motor started overload
Every time and I/O device on a programmable controller is programmed, the device must be assigned an __________
Address
Dynamic braking is normally applied to DC motors because there must be access to the _________ via the brushes to take it vantage of the generator action
Armature
Examples of _________ inputs and outputs are potentiometers, rheostats, encoders, barcode readers, temperature, level, pressure, humidity and wind speed transducers
Data
The amount of reduced torque is adjustable when using the ___________ starting method, which has taps
Autotransformer
DC electric braking circuits, like most DC breaking circuits, use and circuit to change the AC into DC
Bridge rectifier
The current drawn by a motor when starting is excessive due to the lack of _______ at the instant of starting
CEMF
_________ sensors can detect material such as plastic, glass, water, moist wood, etc.
Capacitive
A ______ operation is an operation that has feedback from the output to the input
Closed loop
Pressure sensors are suited for a wide variety of pressure measurements on ____________, pumps, and other similar equipment
Compressors
When an output device does not operate, the problem may lie in the output module, Output device, or _________
Controller
Plugging is a method of motor breaking in which the motor connections are reversed so that the motor develops an _________ that acts as a breaking force
Countertorque
The ________ flowing through a photo diode increases as the resistance decreases
Current
_______ Readings can be taken at the incoming power leads or motor leads
Current
Part winding starting is usually classified as reduced voltage starting because of the resulting reduced ___________
Current and torque
A ______ file is a group of data values, such as inputs, timers, counters, and outputs, that are displayed as a group and whose status may be monitored
Data
Reduced voltage starting provides ______ current draw over a long period of time then for voltage starting
Incremental
A __________ proximity sensor is a sensor that detects only conductive substances
Inductive
When any motor started, high _________ current is produced
Inrush
The primary difference between a photo diode and a regular diode is that a photo diode has an addition of a ____ in its housing for focusing light on the PN junction
Lens
Like PLCs, POR's are designed to be programmed using __________ programming or function blocks
Line
The first programmable controllers used ______ diagrams as a language to input information
Line
Electrical _______ is unwanted signals that are present on a power line
Noise
__________ programming is the use of a PC to program a programmable controller that is not in the run mode
Off-line
The input status indicator located on the input module should turn off and the input symbol should no longer be highlighted in the control circuit on the monitor screen when a NC input device is ________
Open
WYE delta starters have the disadvantage of being transition
Open
A ______ can be used if a control system requires remote monitoring, HMI's, data acquisition of process conditions, motion control, servo/stepper motor control and vision control
PAC
In general, a ________ is considered the first choice for controlling industrial electric circuits and systems
PLC
The _______ starting method requires a nine lead WYE motor
Part winding
A motor and load would start to run in the opposite direction without stopping if a ________ switch were not present in breaking a motor using plugging
Plugging
Typical hall affect sensor package configurations include cylinder, proximity, vane, and
Plunger
The ____________ starting method is used when it is necessary to restrict and rush current to pre-determined increments
Primary resistor
A PLC consist of a power supply, ____________ section, and put section and output section
Processor
The ______ section is the brain of a programmable controller and can be referred to as the central processing unit
Processor
In the _________ mode of a programmable controller, a circuit is monitored and the program is edited, changed, saved and transferred
Program
A ___________ diagram as a line diagram that better matches the language of the programmable controller
Programming
The larger the horsepower size of a DC motor, the less _________ and the higher the current
Resistance
A photocell is, in effect, a variable _____
Resistor
The leakage current problem caused by using a two wire thyristor output can be corrected by placing a load _____ across the input device
Resistor
The purpose of a starting _______ is to reduce the voltage and thus current and torque during starting
Rheostat
When using electric breaking an AC induction motor's, the opposing magnetic fields are induced from the state of windings into the _________ windings by a transformer action
Rotor
Materials such as form, fabric, and _______ are difficult for ultrasonic sensors to detect and a better detected by photo electric or proximity sensors
Rubber
An induction motor ask much like a ______ in the secondary of a transformer when it started
Short circuit
A _______ Circuit is used to suppress a voltage spike
Snubber
A _______ is provided in the control circuit of a primary resistor starting circuit to short the resistors after the motor accelerate to a specified pointer
Timer
Auto transformer starting may use its ______ advantage to provide more current on the load side of the transformer then on the line side
Turns ratio
When a WYE Delta starter is energized, _______ contactors close
Two
A typical controllers can start in the ______ corner of the line diagram
Upper left
A ________ voltage tester (Wiggy) must never be used to measure voltage levels on a programmable controller
Vibrating
Primary resistor starting as a reduced voltage starting method that uses a resistor connected in each motor line to produce a
Voltage drop
WYE delta starting accomplishes produced a voltage starting by first connecting the motor leads in a ______ configuration for starting
WYE
