EASA Part 66 Digital
Questions and Complete
Solutions Graded A+
Question Number. 1. The inside of a CRT consists of.
Option A. an oxide coating and rare mercury gas.
Option B. a phosphor coating and rare mercury gas.
Option C. iodine and rare mercury gas. - Answer: Correct Answer is. a phosphor coating and rare
mercury gas.
Explanation. Pallett - Aircraft Instruments Page 284.
Question Number. 2. CRT horizontal beam control is achieved by a.
Option A. sinusoidal wave.
Option B. square wave.
Option C. sawtooth wave. - Answer: Correct Answer is. sawtooth wave.
Explanation. NIL.
Question Number. 3. In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction
of the electron beam movement?.
Option A. Horizontal.
Option B. Vertical.
Option C. No movement. - Answer: Correct Answer is. Vertical.
Explanation. The Y plates lie horizontal. Use the right hand rule to work out the direction of electron
beam movement. Aircraft Instruments & Integrated Systems, Pallett, page 287.
Question Number. 4. Primary colours of a CRT are.
Option A. red, green and yellow.
Option B. red, blue and yellow.
Option C. red, green and blue. - Answer: Correct Answer is. red, green and blue.
, Explanation. NIL.
Question Number. 5. What are the effects of the X and Y plates on a CRT?.
Option A. Y plates move the beam vertically, X plates move the beam horizontally.
Option B. X plates move the beam vertically, Y plates move the beam horizontally.
Option C. X and Y plates can move the beam in either direction. - Answer: Correct Answer is. Y plates
move the beam vertically, X plates move the beam horizontally.
Explanation. NIL.
Question Number. 6. EADI sky and ground display is provided by.
Option A. synthetic TV signals.
Option B. stroke pulse.
Option C. raster scan. - Answer: Correct Answer is. raster scan.
Explanation. NIL.
Question Number. 7. What frequency creates the raster effect on a CRT?.
Option A. 50/60 Hz.
Option B. 250Hz.
Option C. 400 Hz. - Answer: Correct Answer is. 50/60 Hz.
Explanation. NIL.
Question Number. 8. The sweep waveform used on a electromagnetic CRT is.
Option A. trapezoidal.
Option B. sinusoidal.
Option C. sawtooth. - Answer: Correct Answer is. trapezoidal.
Explanation. Do not get confused with an electrostatic CRT. Electromagnetic CRT uses trapezoidal
waveform to overcome the impedance of the coil.
Question Number. 9. What shape does the waveform take to counter the impedance effect of the coils
in an electromagnetic controlled CRT?.
Questions and Complete
Solutions Graded A+
Question Number. 1. The inside of a CRT consists of.
Option A. an oxide coating and rare mercury gas.
Option B. a phosphor coating and rare mercury gas.
Option C. iodine and rare mercury gas. - Answer: Correct Answer is. a phosphor coating and rare
mercury gas.
Explanation. Pallett - Aircraft Instruments Page 284.
Question Number. 2. CRT horizontal beam control is achieved by a.
Option A. sinusoidal wave.
Option B. square wave.
Option C. sawtooth wave. - Answer: Correct Answer is. sawtooth wave.
Explanation. NIL.
Question Number. 3. In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction
of the electron beam movement?.
Option A. Horizontal.
Option B. Vertical.
Option C. No movement. - Answer: Correct Answer is. Vertical.
Explanation. The Y plates lie horizontal. Use the right hand rule to work out the direction of electron
beam movement. Aircraft Instruments & Integrated Systems, Pallett, page 287.
Question Number. 4. Primary colours of a CRT are.
Option A. red, green and yellow.
Option B. red, blue and yellow.
Option C. red, green and blue. - Answer: Correct Answer is. red, green and blue.
, Explanation. NIL.
Question Number. 5. What are the effects of the X and Y plates on a CRT?.
Option A. Y plates move the beam vertically, X plates move the beam horizontally.
Option B. X plates move the beam vertically, Y plates move the beam horizontally.
Option C. X and Y plates can move the beam in either direction. - Answer: Correct Answer is. Y plates
move the beam vertically, X plates move the beam horizontally.
Explanation. NIL.
Question Number. 6. EADI sky and ground display is provided by.
Option A. synthetic TV signals.
Option B. stroke pulse.
Option C. raster scan. - Answer: Correct Answer is. raster scan.
Explanation. NIL.
Question Number. 7. What frequency creates the raster effect on a CRT?.
Option A. 50/60 Hz.
Option B. 250Hz.
Option C. 400 Hz. - Answer: Correct Answer is. 50/60 Hz.
Explanation. NIL.
Question Number. 8. The sweep waveform used on a electromagnetic CRT is.
Option A. trapezoidal.
Option B. sinusoidal.
Option C. sawtooth. - Answer: Correct Answer is. trapezoidal.
Explanation. Do not get confused with an electrostatic CRT. Electromagnetic CRT uses trapezoidal
waveform to overcome the impedance of the coil.
Question Number. 9. What shape does the waveform take to counter the impedance effect of the coils
in an electromagnetic controlled CRT?.
