Electrical & Electronics Flashcards
PCB
Printed Circuit Board
A board on which components such as transistors, resistors, and microprocessors can be mounted and contains all the circuitry that electronically manipulates the data that enters and leaves the electronic component.
PCB
A PCB specifically designed to provide interfacing between external devices and the component’s central processing unit or microprocessor.
Input/Output (I/O) card
CPU
Central Processing Unit
The computing part or brains of the electronic component.
CPU
The CPUs are contained on a single chip known as ____
Microprocessors
The ___ allow systems to be configured to the specific needs of a particular application.
I/O cards
In systems with spare I/O cards, the spare cards can be used to ___
Replace a bad card and restore the system to full operation temporarily
An electronic device that lights up when electricity passes through.
LED
LED
Light Emitting Diode
Often used to indicate the operational status of an electronic component.
LED
An attachment device that allows for the connection of many different types of electrical and electronic components to a common rail and provides for easy addition and replacement of system components. Also used to provide for a common ground.
DIN or Mounting Rail
A fully enclosed component housing.
Electronic module
Packages a PCB into a shockproof module
Electronic module
Allow the packaging of multiple PCBs, providing flexibility in configuration.
Fully enclosed housings
PIM
Peripheral Interface Module
An insulating base or slab equipped with terminals for connecting wiring.
Terminal strip
A terminal strip is also called a ___
Terminal board
Each terminal strip has at least one ___ under which a wire or component lead may be secured.
Machine screw or other fastener
Terminal blocks come in a variety of types such as ___, ____, or ____
Screw-fastened, Plug-in, or Rail-mounted
Terminal blocks may be numbered to identify ____
Test points that correspond to schematics
Screw-fastened and plug-in terminal blocks are commonly found in ___
Terminal connection boxes
___ are used in locations where it would not be practical to use a terminal block, such as bridge control panels
Mounting rails
To insert or remove a wire from a connection point with a clamping spring, ___
Ensure power is secured, then place a small screwdriver directly into the hole located above the connection point.
Many of the connections for a system can be collocated using a ___
Terminal connection box
Allow users to configure devices or change their operation by connecting or breaking circuits to implement different functions
Jumper
Small piece of plastic and metal that is placed across two circuit ends to make a connection, or removed to break a connection
Jumper
When power is applied to the device, it detects which circuits have been opened or closed
Jumper
A cable that connects one device to another device or power source
Pin connector
Wires in a pin connector can be tested for continuity by ___
putting a jumper between two wires on one end and using a multimeter to test the respective leads on the other end
A thin, flat, multiconductor cable that is widely used in electronic systems for connecting devices within the system
Ribbon cable
Because of their shape, ___ are ideal for situations where space is limited
Ribbon cable
___ in a printed circuit board provide the connection point for additional printed circuit boards such as I/O cards to be inserted
Slots and pin connections
Used to identify test points and component locations
Schematics
When tracing schematics, begin with ___
A single component that can be located on both the schematic and the equipment
The front sheet in a series of schematics will usually contain ___
General notes about the system or the schematics, a list of revisions, and a sheet index/table describing the contents of the subsequent sheets
Each sheet in the series has an ___
Identification block
An ID block contains ___
Title Drawing number Sheet number Scale Revision Manufacturer Platform
CG drawings are divided into ___
Zones with alphanumeric designators
When a drawing continues on another sheet, the schematic will tell you ___
The sheet and if necessary the zone on which the drawing continues
To determine test points you should use the ___
Technical publication or manual
ESD
Electrostatic discharge
The term used to describe the sensitivity of electronic components such as LEDs and circuit boards to static electrical charges
ESD
Created when you rub two nonconducting materials together
Static electricity
Causes a charge to build up on the surface of the material
Friction
A static shock transmits at least ___ volts
3000
Many components will be damaged with charges less than ___ volts
1000
ESD sensitive components may be protected by what methods?
Grounding
Isolation
Prevention
A means of draining the static charges on your body by use of an antistatic wrist strap
Grounding
The purpose of a antistatic wrist strap is to ___
Make sure the operator is at the same potential as the work and the work surface
A ___ is included in the antistatic wrist strap to reduce the possibility of a fatal shock occurring if accidental contact with a high-voltage source should occur
10-megohm resistor in the ground wire
The wrist strap is conductive and should not be brought into contact with ___
The component
___ may be used in addition to antistatic wrist straps
Antistatic mats
___ involves the packing of components and assemblies during storage and transportation
Isolation
Static charges cannot penetrate containers that are made of ___ or have a ___
Conductive materials
Conductive layer
These bags have an inner layer to prevent charge buildup and an outer layer designed to provide static shielding to protect contents from external sources of static charge
Static shield bag
Never remove a board from its antistatic packaging unless ___
You are personally grounded
Process of elimination
Troubleshooting
Involves collecting clues about the problem and using the clues to eliminate the parts of the system that are not the problem
Troubleshooting
Two types of checks in troubleshooting
Visual
Operational
Fault isolation may be accomplished by ___
Standard wire tracing methods
DCV measurements
Continuity checks
If the problem is isolated to the card level, then the faulty card must be ___
Removed and replaced
___ in its simplest for, is an electrical switching device that applies voltage to or removes it from a single load
Control device
Used to control electrically driven pumps and regulate liquid levels in tanks
Float switches
Pressure and temperature controls have been grouped together because ___
The switching is the same for both controls
The difference between pressure and temperature controls
The operation
A temperature element in the switch is arranged so that ___
Changes in temperature cause a change in the volume of a sealed-gas or air-filled bulb or helix, which is connected to the actuating device by a small tube or pipe
A pressure sensor is also known as ___
A pressure transducer
Converts pressure into an electrical signal
Pressure sensor
