ELECTRIFICATION Flashcards
This refers to the part of the control system to be controlled or monitored, it can also be referred to as a process.
PLANT
Certain books refer to this term as (the controlled output CO) and is defined as the signal of interest, the desired result to be obtained from the system.
OUTPUT
A physical interconnection of devices that influences the behavior of other devices or systems.
ELECTRICAL CONTROL SYSTEM
A physical interconnection of devices that influences the behavior of other devices or systems.
ELECTRICAL CONTROL SYSTEM
This can either be a device inside the system or outside the system which regulates the plant or the process. –
CONTROLLER
This is the signal injected into the system from an external energy source. It is majorly referred to as the reference input.
– INPUT
This can be seen as an alien symbol, which can be generated either externally or internally that affects the system in a negative manner. –
DISTURBANCE
System where one in which the output does not feedback to the input to correct variations.
– OPEN LOOP CONTROL SYSTEM
System where one in which the output has an effect upon the input to maintain a desired output value. –
CLOSED LOOP CONTROL SYSTEM
Types of control where the system uses no automatic controls, the link is provided by the human operator. –
MANUAL CONTROL
Types of control where the sequence of operations is carried out automatically after being started by a human operator. –
SEMI-AUTOMATIC CONTROL
Types of control where the human operator is replaced by a controller which monitors the system in comparison with a desired value, using feedback loops to take corrective action if necessary. –
AUTOMATIC CONTROL
Types of control where a level, hand wheel or other attachment fixed on the unit ‘locally’ is used as a means of alteration and control.
– LOCAL CONTROL
Types of control where the regulating unit is connected to an actuating device mounted some distance away by means of power transmission through electrical linkages.
– REMOTE CONTROL
Types of control where the regulating unit can occupy only one of the two available positions of ‘on’ or ‘off’. –
ON/OFF CONTROL
Types of control where more than two positions can be occupied by the regulating unit but the action occurs in steps rather than being continuous. –
STEP-BY-STEP CONTROL
Factor in selecting electric motor where electricity may be direct current (d.c) or alternating (a.c). It may be one of the several voltages. –
TYPE OF ELECTRIC POWER AVAILABLE
Part of a motor where is consists of a slotted core, made up of thin sections of a special soft steel, exercise pet squirrels –
ROTOR
Part of a motor where is consists of a slotted core also made of special laminated steel. Insulated copper wire is wound in the slots in such a way as to form one or more pairs of definite magnetic poles. –
STATOR
type of motor where motor consists of a squirrel-cage rotor and a stator in which are found two different sets of windings. –
SPLIT-PHASE
A Type of motor where motor will operate an either direct or alternating current of the correct voltage –
UNIVERSAL MOTORS
A Type of motor where the direction of rotation of a determined by the way the three line wires are connected to the motor. Interchanging the connections of any two line leads will cause the motor to rotate in the opposite direction, so reversing is a very simple process. –
THREE-PHASE MOTORS
A Characteristic of a Good Electrical System where there are grounding, proper size of conductors and ratings of circuit breakers. –
SAFE
A Characteristic of a Good Electrical System where the design is ready for future expansion. –
EXPANDABLE
A Characteristic of a Good Electrical System where the one that fulfills its needs at the least expense over the lifetime of the system. –
EFFICIENT
Type of grounding where it can be a grounding electrode or any conductive material connected directly or indirectly to earth –
EQUIPMENT GROUNDING
Type of grounding where the main function is to prevent electric shock to persons or animals coming in contact with metallic objects, which themselves have come in contact with a hot conductor due to some electric fault –
EQUIPMENT GROUNDING
electrons at the outermost shell, farthest from the nucleus
valence electrons
rate of charge flow past a given point in an electric circuit
current
the work required to move a unit charge from one location to another
voltage
the relative difficulty with which current can be transmitted in a material
resistance
most conductors ____ in resistance with an increase in temperature
increase
components are connected end-to-end in a line to form a single path for electrons to flow
series circuit
all components are connected between the same set of electrically common points
parallel circuit
AC stands for____
altenating current
this is the basic operating principle of an AC generator
alternator
has the ability to step voltage up or step voltage down from the powered coil to the unpowered coil
transformer