NIMCET Computer Organization And Architecture (COA) Previous Year Questions (PYQs)
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Showing 4 questions
Let the memory access time is 10 milliseconds and cache access time is 10 microseconds. Assume the cache hit ratio 15%. The effective memory access time is
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Solution
Incorrect Answer
Micro programmed control unit is:
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Solution
Microprogrammed control units are slower than hardwired units but make it easy to add or modify instructions.
A CPU has an arithmetic unit that adds bytes and then sets its V, C and Z flag as follows:
V-bit is set if arithmetic overflow occurs
C-bit is set if carry-out is generated from the most significant bit
Z-bit is set if the result is zero
What are the values of V, C and Z flag bits respectively after the 8-bit bytes
1100 1100 and 1000 1111 are added?
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Solution
11001100 + 10001111 = 1 01011011
Carry-out occurs → C = 1
Signed overflow occurs → V = 1
Result is not zero → Z = 0
The main disadvantage of direct mapping of cache organization is that
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Solution
In direct mapping, multiple memory blocks may map to the same cache line, causing frequent replacement (conflict misses), which degrades the hit ratio.
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