Electronics

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Flashcards	474
Language	Deutsch
Category	Electronics
Level	Primary School
Created / Updated	12.01.2015 / 21.01.2020
Weblink	https://card2brain.ch/box/electronics_
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The connection in parallel of two 12 volt/40 Ah batteries, will create a unit with the following characteristics:

12 V / 80 Ah

24V / 40 Ah

The connection in series of two 12 volt/40 Ah batteries, will create a unit with the following characteristics:

24 V/ 40Ah

12 V/ 80 Ah

The voltage of a fully charged lead-acid battery cell is approximately

2,2 V

1,4 V

1,8 V

When a conductor cuts the fiel lines of a magnetic field:

a Lorentz force is induced in the conductor

the field will collapse

When a conductor cuts the fluy of a magnetic field:

an electromotive force (emf) is induced in the conductor

current will flow in accordance with Fleming's left hand rule

Usually, in conductive materials:

the resistance increases with increasing temperature

the resistance decreases with increasing temperature

The most widely used AC frequency in aircraft is:

400 Hz

200 Hz

115 Hz

Which of teh following parts is a typical semiconductur part?

Transistor

Resistor

One indication of inadequate electrical bonding of aircraft components may be:

static noise on the radio

a circuit breaker popping out

electrica power ?

P
V
I

P = V x I

P = V / I

A thermal circuit breaker?

protects the system in the event of a prolonged overcorrect

protects the system in the event of any overheating

The international symbol of electrical power is:

P and its measured in watts

I and its measured in amperes

The primary purpose of bonding the metallic parts of an aircraft is to:

provide safe distribution of electrical charges and currents

provide a single earth for all electrical devices

Circuit breakers protecting circuits may be:

used in AC and DC circuits

Reset at any time

A trip free type circuit breaker is a circuit protection device which:

will not allows the contacts to be held closed while a current fault exists in the circuit

can be reset at any time

will allows the contacts to be held closed in order to clear a fault in the circuit

The rating of electrical fuses s expressed in :

Amperes

Ohms

A relay is...

an electrical switch

a connector

Fuses are rated to a value by ...

the number of amperes they will carry

their resistance measured in ohms.

What figure is fuses and circuit breakers rated in?

Ampere

Ohm

Watt

Volt

Where is a solenoid often used?

engaging starter motor

switching small currents

Circuit breakers are fitted in...

Series with the load

Parallel with the load

Across the load

Between the load terminals

What is the result when current passes through a rectifier?

AC becomes pulsating DC

AC becomes constant DC

A transformer is a device for:

Stepping up or stepping down AC voltages

Stepping up or down either AC or DC

In a two generator system, a differential relay will ensure that

generator voltages are almost equal before the generators are paralleled.

only one generator can supply the bus-bar at a time.

generator voltages are not equal, dependent on load.

Full wave rectification of a single phase AC supply requires an arrangement of:

four diodes

one diodes

two diodes

The rating of an AC generator is usually given in...

kVA

kVAR

An air-driven generator (RAT) supplies

A constant frequency AC output

A constant frequency AC output via a hydraulic pump or converter

A frequency wild AC output

Heaters and electrical de-icing systems can be supplied by frequency-wild AC with voltage regulation because...

Resistance is independent of frequency

Impedance does not change with frequency

Inductive Reactance is not affected by frequency

Capacitive Reactance is not affected by frequency

The advantages of alternating current on board an aircraft are :
1. simple connection
2. high starting torque
3. flexibility in use
4. lighter weight of equipment
5. easy to convert into direct current
6. easy maintenance of machinesThe combination of correct statements is

1,2,3,4,5,6

1,2,3,4,6

3,4,5,6

In an aircraft electrical system where AC generators are not paralleled mounted, the changeover relay allows

power supply to the faulty AC generators busbar.

connection of the AC generator to its distribution busbar.

Two AC voltage levels are available in...

a Star system

a Delta system

a Commutator system

The induction motor has...

No slip rings and brushes

Slip rings and brushes

A voltage regulator

A commutator

When load sharing AC generators, real and reactive loads are adjusted by controlling

Frequency and voltage

CSD speed

Field excitation of an AC generator when running is provided by...

A DC supply

A constant frequency AC supply

A frequency wild AC supply

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