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B2 MODULE 5 > Subsection 11 Electronic Displays > Flashcards

Subsection 11 Electronic Displays Flashcards

1
Q

‘Submarining’ is caused by the inability of some LCD screens to?

A

Respond to fast moving images on screen

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2
Q

A ‘Starburst’ LED has a minimum of?

A

14 segments

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3
Q

Beam deflection on EFIS displays are?

A

Electromagnetic

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4
Q

A circular waveform is produced by?

A

2 AC voltages out of phase by 90 degrees

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5
Q

A colour LCD which is backlit has?

A

3 colours

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6
Q

A colour LCD which is back lit is constructed of pixels, each of which has?

A

3 subpixels

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7
Q

A CRT display has the advantage oover an LCD display of a?

A

Large viewing angle

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8
Q

A digital meter LCD display has?

A

One segment at a time

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9
Q

A dot matrix/LED construction is

A

5x9 or a 4x7 rolling end display

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10
Q

A liquid crystal display has?

A

The advantage over a CRT

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11
Q

A segment type LED display usually comprises of?

A

Seven individual LED’s

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12
Q

A segmented configuration for the display of alphanumerical data requires?

A

16 segments to display the full range of capital letters and numerals

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13
Q

A seven segment display is used to display?

A

Octal and decimal numbers only

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14
Q

A shadow masks CRT works by one layer of RED,GREEN and BLUE dot matrix excited by?

A

Their own electrode guns

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15
Q

An LCD display has?

A

Three colours

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16
Q

An LCD display uses what type of power supply?

A

Continuous AC

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17
Q

An LED central warning panel on an aircraft has the advantage over a conventional filament bulb type central warning panel in that they are?

A

Lower maintenance and lower power consumption

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18
Q

An LED display is?

A

Monochrome only

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19
Q

An LED will emit light when it is?

A

Forward biased

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20
Q

At low ambient temperatures an LCD screen is?

A

Slower to update as data changes

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21
Q

Colour CRT shadow mask screen resolution is?

A

84 triads

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22
Q

CRT horizontal beam control is achieved by a?

A

Sawtooth Wave

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23
Q

EADI sky and ground display is provided by?

A

Raster scan

24
Q

Electronic CRT beam display is used typically in?

A

Weather radar indicators

25
Q

How are alphanumerical displays produced on a CRT?

A

By stroke pulse

26
Q

How are colours produced on an active matrix LCD (AMLCD)?

A

By controlling the intensity of the tri-colour emitters in each pixel

27
Q

If a magnetic field is parallel to the X plates in a CRT, which way will the beam move?

A

Horizontally

28
Q

If the magnetic deflection coils produce a magnetic field which is parallel to the horizontal then the trace is deflected in the?

A

Vertical Axis

29
Q

In a colour cathode ray tube, how is the phospher arranged arranged in the tube?

A

A single phospher layer containing Red, Green and Blue

30
Q

In a CRT if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?

A

Vertical

31
Q

In an ES CRT the focus is controlled by an?

A

Electrostatic field between the Anodes

32
Q

Intensity of a CRT is controlled by varying the grid voltage with respect to the?

A

Cathode voltage

33
Q

LED’s can give?

A

Monochrome displays only

34
Q

LCD screens are driven by?

A

AC volage

35
Q

Magnetic deflection in a CRT is achieved by a?

A

Trapezoidal waveform

36
Q

Primary colours of a CRT are?

A

RED,GREEN and BLUE

37
Q

Regarding CRT monitors the brilliance of a colour CRT compared to a Monochrome CRT is?

A

LOWER

38
Q

The deflecting waveform supplied to the plates of an electrostatic display is a?

A

Ramp wave

39
Q

The inside of a CRT consists of a?

A

Phospher coating and rare mercury gas

40
Q

The most common CRT control for an EFIS system screen is a?

A

Combined system

41
Q

The release of a photon by another photon is the principle of?

A

An LED

42
Q

The shorter lead near the flat portion of an LED is?

A

The cathode

43
Q

The supply to an LCD is?

A

AC

44
Q

The sweep waveform used on a electromagnetic CRT is?

A

Trapezoidal

45
Q

The timebase in a CRT consists of ?

A

An amplifier and an oscillator

46
Q

The trace of an oscilloscope begins when the input level is approximately 10 volts but the peak values indicate 20 volts. What can be done to cause the trace to begin at zero volts?

A

Adjust the trigger level to zero volts trigger

47
Q

To deflect the beam of a CRT horizontally, coils are placed on the neck of the tube?

A

Top and bottom

48
Q

To display a circle on a CRT you use 2 sine waves?

A

90 degrees out of phase

49
Q

What are the advantages of an LCD display over an LED?

A

Uses less current

50
Q

What are the effects of the X and Y plates on a CRT?

A

Y plates move the beam vertically, X plates move the beam horizontally

51
Q

What controls the image on the screen of a cathode ray tube?

A

Symbol generators

52
Q

What creates the raster effect on a CRT?

A

Sawtooth frequency

53
Q

What frequency creates the raster effect on a CRT?

A

50/60 Hz

54
Q

What shape does the waveform take to counter the impedance effect of the coils in an electromagnetic controlled CRT?

A

Trapezoid

55
Q

Which of the following electronic displays are commonly used in aircraft?

A

Cathode ray tube and light emitting diodes

B2 MODULE 5 (17 decks)

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