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WorksheetsBlock 4 Study Guide(New)
Total questions: 56
Worksheet time: 28mins
The smallest particle of matter that can exist and still retain its identity is a:
Element
Molecule
Compound
The particles that make up matter are always moving. This is described by:
Atomic motion principle
The kinetic theory
Molecular fusion
Ionization is defined as:
The process by which an atom gains or loses neutrons
The loss or gain of electrons by an atom
The bonding of two different atoms
The outermost electrons are called:
Free electrons
Atomic shells
Energy bands
Electrons at rest are:
Bound charge
Neutral particles
Static
Electrons in motion are:
Moving charges
Dynamic
Atomic flow
A field of force around a charged body is called:
Electrostatic field
Electric impulse
Magnetic resistance
Parts that are ESD sensitive are typically shipped in:
Insulated plastic containers
Specially designed bags
Anti-shock foam boxes
The measure of opposition to the lines of force is known as:
The magnetic field around a conductor will increase with:
Greater current flow
Increasing resistance
Reducing voltage
Electrons in motion are known as:
Moving charges
Current or Current Flow
Electrical particles
Conductors offer ______ resistance to current flow.
Moderate
Variable
Insulators offer ________ resistance to current flow.
Negligible
Intermittent
If the area of a conductor is doubled, its resistance will:
Increase exponentially
Be reduced by half
Remain unchanged
A variable resistor with 3 terminals that varies voltage is known as a _______.
Transformer
current
A resistor used to vary current is called a:
Fixed resistor
Rheostat
Circuit limiter
A circuit in which the same voltage source is applied across two or more resistances or loads is called:
Open circuit
Parallel
Series connection
How does Alternating Current change voltage when transmitted over long distances?
Voltage equalizers
Rectifier circuits
Transformers
When a bar magnet is moved through a coil of wire, a voltage is induced and can be measured with a voltmeter. This is known as:
Electrical flux
Faraday’s Law
Ohm’s principle
The ratio of true power to apparent power is called:
Power factor
Efficiency rating
Load coefficient
What device consists of two coils that are not electrically connected but are arranged so that the magnetic field surrounding one coil cuts through the other coil?
Electromagnet
Transformer
Motor winding
If a transformer steps up the voltage, it steps down the current by the same ratio. What happens to power?
Power is lost as heat
Power efficiency increases
Power will remain the same
In a DC generator, what causes the current to flow always in the same direction through the external circuit?
Rotating stator
Commutator action
Magnetic flux stabilizer
When resistors are connected in parallel, the total resistance of the circuit will _______
The function of the ohmmeter is to measure
If a transformer steps up the voltage, it steps down the current by the same ratio, what happens to power?
Power remains the same
An open circuit represents ____ resistance.
infinitely large
medium amount of
low
A short circuit usually creates ______ current flow.
high
When reading amperage in a circuit, the meter should be connected in _______ with load.
parallel
relation
How can you charge a dry cell battery
The charge of battery is not reversible
Battery life cycle is defined as
the process of charging/discharging cylces
The state of charge of a lead-acid is indicated by
Specific gravity or density of electrolyte with hydrometer
Which battery uses potassium hydroxide as an electrolyte?
To check the electrolyte level in a Ni-Cad battery
Use Hydrometer
Fully charge battery then check fluid level
This type of battery has replaced Ni-Cad batteries due to it's "memory effect"
Sealed Lead-Acid
Which describes a direct short in an electrical circuit?
Where full system voltage comes in contact with the ground or return side of the circuit
The schematic symbol for a current limiter?
A SPST Switch
The same as that for a fuse
What type of switch has an LED bulb to illustrate function?
microswitch
lighted push button switch
rotary switch
The amount of EMF(Electromotive Force) is depended on:
number of wires , strength of magnetic field, speed of rotation.
The relationship between voltage and current in a AC circuit is known as:
Phase
When a wire is formed into a coil is becomes a:
Impedance is the combined effects of what 3 things:
Resistance, inductive reactance, and capacitive reactance
When are three-phase induction motors are used:
Where large amounts of power are required
The three-phase AC induction motor is also called
The most common alternator used in aircraft systems today is the
3 phase alternator
Among the factors, which determine the voltage output of a generator, only one, ______can be conveniently controlled.
strength of the field current
The purpose of the reverse current cutout relay is to
disconnect the battery from the generator when generator voltage is lower that battery voltage
The purpose of the vibrator-type current limiter is to
limit the output current of the generator automatically to its maximum
Since the speed of an aircraft engine varies, what keeps the alternator output steady
Constant speed drive
Electrons flow at what speed?
drift velocity
speed of light
proton mass is greater than electron
Permeability is known as?
the each which magnetic flux can penetrate a material
Ni-Cads have an undesirable characteristic caused by constant overcharge and infrequent discharge, and known technically as
voltage depression
The lead acid battery is made up of a series of cells, each containing positive plates of _________, and negative plates of __________.
lead dioxide, spongy lead
Since inductive reactance causes voltage to lead the current, the total current which contains a component of inductive current __________ the applied voltage
One amp of current is equivalent to one coulomb, one coulomb of charge is equal to
drift velocity
one farad
6.28 billion electrons
Nearly all fractional horsepower motors in use today are of what type
capacitor start motor
dc start motor
synchronous
