Display & Control Systems
Subelement D
Section 29
Displays
Modern liquid crystal displays have a pixel count of:
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Correct AnswerGreater than 200 pixels per inch.
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Greater than 50 pixels per inch.
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Can have no more than 125 pixels per inch.
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Can implement 1,000 pixels per inch.
Modern liquid crystal displays have a pixel count of:
(A). Greater than 200 pixels per inch.
It must have been a long time since the 200 pixels displays were used. An easy answer to pick as other choices limit the number of pixels well below what is in use.
A good discussion on radar displays is listed on the Practical Sailor site, article Entry-Level LCD Radars
For historical and technical overview, please see Zoboko site for the article 2.8 The Radar Display and User Controls
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Voltages used in CRT anode circuits are in what range of value?
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0.5-10 mV.
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Correct Answer10-50 kV.
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20-50 mV.
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200-1000 V.
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The purpose of the aquadag coating on the CRT is:
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To protect the electrons from strong electric fields.
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To act as a second anode.
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To attract secondary emissions from the CRT screen.
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Correct AnswerAll of the above
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LCD patterns are formed when:
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Correct AnswerCurrent passes through the crystal causing them to align.
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When voltage is reduced to the raster scan display.
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When the deflection coils are resonant.
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When the ships antenna's bearing is true North.
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In a raster-type display, the electron beam is scanned:
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From the center of the display to the outer edges.
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Correct AnswerHorizontally and vertically across the CRT face.
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In a rotating pattern which follows the antenna position.
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From one specified X-Y coordinate to the next.
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Select the statement, which is most correct regarding a raster scan display.
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Raster displays are the same as conventional T.V. receivers.
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The scan rate for a RADAR system is 30 frames per second.
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Correct AnswerRaster scanning is controlled by clock pulses and requires an address bus.
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Raster scanning is not used in RADAR systems.
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