Subsection 11 Electronic Displays

Question 1

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

Answer 1

Respond to fast moving images on screen

Question 2

A ‘Starburst’ LED has a minimum of?

Answer 2

14 segments

Question 3

Beam deflection on EFIS displays are?

Answer 3

Electromagnetic

Question 4

A circular waveform is produced by?

Answer 4

2 AC voltages out of phase by 90 degrees

Question 5

A colour LCD which is backlit has?

Answer 5

3 colours

Question 6

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

Answer 6

3 subpixels

Question 7

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

Answer 7

Large viewing angle

Question 8

A digital meter LCD display has?

Answer 8

One segment at a time

Question 9

A dot matrix/LED construction is

Answer 9

5x9 or a 4x7 rolling end display

Question 10

A liquid crystal display has?

Answer 10

The advantage over a CRT

Question 11

A segment type LED display usually comprises of?

Answer 11

Seven individual LED’s

Question 12

A segmented configuration for the display of alphanumerical data requires?

Answer 12

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

Question 13

A seven segment display is used to display?

Answer 13

Octal and decimal numbers only

Question 14

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

Answer 14

Their own electrode guns

Question 15

An LCD display has?

Answer 15

Three colours

Question 16

An LCD display uses what type of power supply?

Answer 16

Continuous AC

Question 17

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

Answer 17

Lower maintenance and lower power consumption

Question 18

An LED display is?

Answer 18

Monochrome only

Question 19

An LED will emit light when it is?

Answer 19

Forward biased

Question 20

At low ambient temperatures an LCD screen is?

Answer 20

Slower to update as data changes

Question 21

Colour CRT shadow mask screen resolution is?

Answer 21

84 triads

Question 22

CRT horizontal beam control is achieved by a?

Answer 22

Sawtooth Wave

Question 23

EADI sky and ground display is provided by?

Answer 23

Raster scan

Question 24

Electronic CRT beam display is used typically in?

Answer 24

Weather radar indicators

Question 25

How are alphanumerical displays produced on a CRT?

Answer 25

By stroke pulse

Question 26

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

Answer 26

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

Question 27

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

Answer 27

Horizontally

Question 28

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

Answer 28

Vertical Axis

Question 29

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

Answer 29

A single phospher layer containing Red, Green and Blue

Question 30

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

Answer 30

Vertical

Question 31

In an ES CRT the focus is controlled by an?

Answer 31

Electrostatic field between the Anodes

Question 32

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

Answer 32

Cathode voltage

Question 33

LED's can give?

Answer 33

Monochrome displays only

Question 34

LCD screens are driven by?

Answer 34

AC volage

Question 35

Magnetic deflection in a CRT is achieved by a?

Answer 35

Trapezoidal waveform

Question 36

Primary colours of a CRT are?

Answer 36

RED,GREEN and BLUE

Question 37

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

Answer 37

LOWER

Question 38

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

Answer 38

Ramp wave

Question 39

The inside of a CRT consists of a?

Answer 39

Phospher coating and rare mercury gas

Question 40

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

Answer 40

Combined system

Question 41

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

Answer 41

An LED

Question 42

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

Answer 42

The cathode

Question 43

The supply to an LCD is?

Answer 43

AC

Question 44

The sweep waveform used on a electromagnetic CRT is?

Answer 44

Trapezoidal

Question 45

The timebase in a CRT consists of ?

Answer 45

An amplifier and an oscillator

Question 46

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?

Answer 46

Adjust the trigger level to zero volts trigger

Question 47

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

Answer 47

Top and bottom

Question 48

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

Answer 48

90 degrees out of phase

Question 49

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

Answer 49

Uses less current

Question 50

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

Answer 50

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

Question 51

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

Answer 51

Symbol generators

Question 52

What creates the raster effect on a CRT?

Answer 52

Sawtooth frequency

Question 53

What frequency creates the raster effect on a CRT?

Answer 53

50/60 Hz

Question 54

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

Answer 54

Trapezoid

Question 55

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

Answer 55

Cathode ray tube and light emitting diodes