If the 360 degree sweep were divided into only 255 digitized segments then the minimum resolution would be just over 1.4 degrees per segment:
360 / 255 = 1.4
This resolution must be better than one degree per segment, so Answer D. with 4,096 segments (and a resolution of 5.5 minutes per segment) is the right answer.
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The term "Raster Scan" indicates the memory problem lies with the RADAR's video diplay.
DRAM - Dynamic Random Access Memory is the working memory used by video cards to store the image that is being displayed on-screen, so Answer B. is the right one.
SRAM - Static Random Access Memory is a much faster, more expensive and more power-hungry memory that is used by microprocessor chips for high-speed low latency cache memory access, thus Answer A. is incorrect.
ROM - Read-Only Memory is only suitable for storing unmodifiable data or software (e.g. firmware), thus Answer C. is incorrect.
PROM - Programmable Read-Only Memory is re-writable ROM (e.g. suitable for updatable firmware,) thus Answer D. is incorrect.
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Sea clutter is due to the RADAR picking-up returns from nearby waves. Since waves usually move relative to the ship they will never be in the same position from one RADAR sweep to the next and can therefore be easily identified as such and not be rendered on-screen, thus Answer A. is the right answer.
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For this exam "the primary purpose of display system memory" is used to store the last two RADAR sweeps so as to detect and eliminate fluctuating targets, so Answer A. is the correct answer.
Outside the scope of this exam, "the primary purpose of display system memory" is to be able to display an image on a computer display.
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