Electricity test 2, part 2

44問 • 2年前

問題一覧

In some designs, an AC synchronous motor will have ____ flow through its stator (armature) while _____ flows through its rotor.

Alternating current Direct current

A three unit voltage regulator is made up of?

Voltage regulator Current limiter Reverse current relay

How many magnetic fields are there in an AC motor?

What electrical equipment changes the voltage amount and voltage type to operate the different electrical aircraft loads?

Transformer rectifier

A “Rotary inverter” uses a ___ motor to drive an AC generator?

A static inverter uses transistors to change DC into a _____ before it’s modified into a _____?

Square wave, sine wave

What do corporate jets and light aircraft use inverters for?

Full time “AC” Power

A reverse current relay is sometimes called a _____?

Reverse current cutout relay

The purpose of the reverse current cutout relay is to prevent a generator from _____ the battery when the generator output is ___ than battery voltage.

Over charge, less

In a 3 phase alternator, the input is ____ and the output is____?

Input = alternating current Output = direct current

A machine that changes direct current into alternating current is called an ____?

Inverter

Slip rings are components found in?

Alternators

Commutators are found in ____?

Generator

How would a generators output voltage be affected by a stuck “closed” contact in a vibrating voltage regulator?

Generator output voltage would increase and remain high

Generator voltage regulation is important to providing aircraft electrical equipment a constant voltage to operate efficiently. Regulating generator output voltage also is required to protect the generator and its various loads from damaged. “What methods to control generator output voltage”?

4 methods •increase or decrease the strength of the magnetic field by adding or removing magnets, conductors in armature. •4 methods •increase or decrease the strength of the magnetic field by controlling the field current •increase/ decrease frequency

What type of power does an alternator produce?

The stator magnetic field in an induction AC motor induces a ____ in the rotor that produces a second _____ field.

Current, magnetic

Large transport category aircraft use inverters when they have lost power from ?

AC power sources

What type of power does a “generator”normally produce?

Direct current, DC

CSD operating condition for “under drive”

Input engine speed greater than 6000rpm

CSD operating condition “straight drive”

Input engine speed is 6000 rpm

CSD operating condition for “overdrive”

Input engine speed is less than 6000 rpm

Motor slip calculation

(Synchronous speed - rotor speed) / (synchronous speed) x 100

If a problem develops in the number 2 IDG identify the switch used by the flight crew or maintenance personal to disconnect it from associate engine gear case. What button would you hit to do this?

Flick “disconnect switch”

How many “power sources” can a synchronous AC motor have?

One

How many magnetic fields are there in a synchronous AC motor?

Two

To prevent arcing in an aircraft alternator the brush and slip ring assembly is replaced with ___ devices called ____?

Solid state devices, diodes

Electrical arcing becomes a greater problem as the aircraft flies _____ in altitude because the air becomes _____ of an insulator.

Higher, less

This type of alternator is called a brushless alternator and requires _____ maintenance than a brushed alternator

Less

Two phase motor produces ?

Rotating magnetic field

A three phase motor produces?

A rotating magnetic field

A single phase motor produces

A pulsating magnetic field

On a large transport aircraft where is a static inverter most likely installed?

Electronics equipment bay, avionics bay

Growling sounds?

A disconnected lead in a three phase motor

Knocking sound

Loose armature coil, a shaft out of alignment, or a worn bearings

Grunting sound?

Overloaded motor

Humming sound

No issue, motor in good condition

What does a field circuit control?

Field current

How would a generators output voltage be affected by a stuck open contact in a vibrating voltage regulator?

Generator output voltage would “decrease” and remain “low”

Single phase synchronous motors are used to power precision equipment such as ?

Electric clocks, engine instruments

While I’m flight the easiest method of controlling generator output voltage is to ?

Vary the strength of the field current

“Not all generators use slip rings or commutators” to carry current to a load. What semi-conductor can be used to replace slip rings and commutators?

Diodes

AC generators and DC generators use slip rings assemblies and commutators assemblies to carry current to the load. What other components are needed to complete these assemblies?

Housing, springs, carbon brushes

What is the frequency of a generator with 4 poles and spinning at 3,100 rpm?

103

Composites test 2

Zachary Halycz · 54問 · 2年前

Composites test 2