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# UGC-NET | UGC NET CS 2018 July – II | Question 8

• Last Updated : 23 Sep, 2020

A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately :
(A) 16 frames per second
(B) 19 frames per second
(C) 21 frames per second
(D) 23 frames per second

Explanation:

Total pixels in the frame buffer = (width  x height)= 640 x 480 px = 307200

Here, color depth is 1 bit.

Memory required by frame buffer = Memory required for total pixel =

Total pixels in the frame buffer x (Color depth) = 307200 x 1

If access time for each pixel on the average is 200 ns

Time required to refresh  “frame buffer” = Memory required by frame buffer x 200 ns = 61440000 nano second = 61440000 x 10−9 second

Then, refresh rate of frame buffer =

number of frame changes per second = 1 / 61440000 x 10−9 second = 100,00,00,000 / 61440000 = 100,000 / 6144 = 16.2760 = 16 (Approximately)

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