Key Topic 29: Displays

Question 1

8-29D1: Modern liquid crystal displays have a pixel count of:

A. Greater than 200 pixels per inch.
B. Greater than 50 pixels per inch.
C. Can have no more than 125 pixels per inch.
D. Can implement 1,000 pixels per inch.

Answer 1

A. Greater than 200 pixels per inch.

Question 2

B. 8-29D2: Voltages used in CRT anode circuits are in what range of value?

A. 0.5-10 mV.
B. 10-50 kV.
C. 20-50 mV.
D. 200-1000 V.

Answer 2

B. 10-50 kV.

Question 3

8-29D3: The purpose of the aquadag coating on the CRT is:

A. To protect the electrons from strong electric fields.
B. To act as a second anode.
C. To attract secondary emissions from the CRT screen.
D. All of the above.

Answer 3

D. All of the above.

Question 4

8-29D4: LCD patterns are formed when:

A. Current passes through the crystal causing them to align.
B. When voltage is reduced to the raster scan display.
C. When the deflection coils are resonant.
D. When the ships antenna’s bearing is true North.

Answer 4

A. Current passes through the crystal causing them to align.

Question 5

8-29D5: In a raster-type display, the electron beam is scanned:

A. From the center of the display to the outer edges.
B. Horizontally and vertically across the CRT face.
C. In a rotating pattern which follows the antenna position.
D. From on specified X-Y coordinate to the next.

Answer 5

B. Horizontally and vertically across the CRT face.

Question 6

8-29D6: Select the statement, which is most correct regarding a raster scan display.

A. Raster displays are the same as conventional TV receivers.
B. The scan rate for a RADAR system is 30 frames per second.
C. Raster scanning is controlled by clock pulses and requires an address bus.
D. Raster scanning in not used in RADAR systems.

Answer 6

C. Raster scanning is controlled by clock pulses and requires an address bus.