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EASA QUESTIONS > M4 B2 > Flashcards

M4 B2 Flashcards

1
Q

What is done to an element to make it a semiconductor material?

A

The lattice of pure element is doped with elements that contain 3 or 5 valence electrons.

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2
Q

What is most commonly used as rectifiers in electrical circuits?

A

Diodes

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3
Q

When a PN junction is forward biased, the depletion zone …

A

narrows

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4
Q

The voltage applied to a reversed biased diode that causes the diode to breakdown and allow current flow is known as …

A

Avalanche Voltage

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5
Q

A typical application for Zener diodes is as …

A

Voltage regulators.

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6
Q

A rectifier Diode is used in applications that require … current

A

High

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7
Q

Name three dangers of diodes

A

Heat, over-voltage and over-current diodes.

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8
Q

A diode offers … to current flow which causes a … drop

A
  1. resistance
    2.Voltage
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9
Q

A sillicon controlled Rectifier (SRC´s) use a … to control when current flow through the device

A

gate

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10
Q

UJT´s (unijunction) and FET´s(Field Effect) are types of …

A

Transistors

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11
Q

Complementary MOSFET(CMOS) devices are used to make … to build digital logic gates

A

transistors

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12
Q

What logic gate will provide an active high output only when all inputs are different?

A

Exclusive Or

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13
Q

The board of a printed circuit board is made of what material?

A

non-conductive

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14
Q

what is a conductive path on a printed circuit board is called

A

Trace

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15
Q

True or false
An open loop system uses feedback to ensure that controlled mechanisms have been moved to the proper position.

A

False. Closed loop systems have feedback, an open loop system does not.

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16
Q

Which describes the basic operation of a synchro system for
remote position indication?
1. A transmitter sends varying voltages to an indicator
motor which moves a pointer.
2. Resistances are compared in the transmitter and the
result is sent to the indicator motor to position a pointer.
3. A magnetic field in the transmitter is mirrored in the
indicator where a magnetic rotor aligns with the
magnetic field.

A
  1. A magnetic field in the transmitter is mirrored in the
    indicator where a magnetic rotor aligns with the
    magnetic field.
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17
Q

What three factors affect the amount of electricity that a capacitor can store?

A

Area of the plates, Distance of the plates and the Dielectric constant of the material between the plates.

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18
Q

The relationship between frequency and wavelength is …

A

inversely proportional

19
Q

radio waves are directional and propagate out into space at …

A

186,282 miles per second (speed of light)

20
Q

The electric field component and the … component of a radio wave are oriented 90° to each other, and at 90° to the direction that the wave is traveling

A

electromagnetic field

21
Q

Ground waves or surface radio waves follow the curvature of the earth and are

A

low frequency waves

22
Q

VHF communication radios are the primary communication radios used in aviation. They operate in what frequency range?

A

118.0 MHz to 136.975 MHz

23
Q

To transmit and receive useful information, a radio wave is altered or modulated by …

A

an information signal

24
Q

In an AM radio transmission, the radio wave is altered to carry useful information by modulating the …

A

Amplitude of the wave.

25
Q

Since the transmitter oscillator output fluctuates during modulation to represent the information signal, FM bandwidth is

A

Greater than AM bandwidth

26
Q

When two AC signals are mixed together, such as when a carrier wave is modulated by an information signal, three main frequencies result, what are they?

A

The original carrier wave frequency, the carrier wave frequency plus the modulating frequency, and the carrier frequency minus the modulation frequency.

27
Q

what does radio transmitters and receivers are electronic devices manipulate, resulting in the transmission of useful information through the atmosphere or space

A

they manipulate electricity

28
Q

The basis of a transmitter in an precise … that creates an AC carrier wave frequency and amplifies it

A

oscillator

29
Q

What isolates the desired carrier wave with its information

A

a receiver

30
Q

What is a communication radio that transmits and receives?

A

A transceiver

31
Q

Three characteristics are of major concern when considering antennas are?

A

Length, polarisation and directivity.

32
Q

what can help make an antenna effectively shorter by being placed in series with the transmission line from the transmitter or receiver?

A

a capacitor

33
Q

The electric field caused by the voltage in a conductor is parallel to the … of an antenna and is caused by the voltage difference between each end of the antenna

A

polarization

34
Q

The three basic types of antennas used in aviation are the

A

Dipole, macron and loop antenna.

35
Q

Transmission lines from transmitters to receivers are

A

coaxial cables

36
Q

ADS-B stands for

A

Automatic dependent surveillance broadcast.

37
Q

ADS-B OUT combines the positioning information available from … receiver with on-board flight status information. exp: location including altitude, velocity and time

A

GPS

38
Q

Name 3 advantages of ADS-B over conventional ground-based radar

A

lower expense to cover entire airspace, more accurate,
weather dies not interferer with GPS signals

39
Q

ELT stands for

A

Emergency Locator transmitter

40
Q

An ELT is activated by excessive

A

G-forces

41
Q

Second generation 406 MHz gidital ELT signals are loaded with …

A

GPS location coordinates

42
Q

Any purposeful activation of an ELT signal by maintenance personnel is required to only be done

A

between the top of each hour and 5 minutes after the hour.

43
Q

name 3 advantages to the 406 MHz ELT format over the original 121,5MHz system

A

Improved coverage
Improved location accuracy
Identification of false alerts
Shortened response times.

EASA QUESTIONS (1 decks)

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