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MCA NIMCET Previous Year Questions (PYQs)

MCA NIMCET Computer Organization And Architecture (COA) PYQ


MCA NIMCET PYQ
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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MCA NIMCET Previous Year PYQ MCA NIMCET NIMCET 2018 PYQ

Solution

Incorrect Answer

MCA NIMCET PYQ
Micro programmed control unit is:





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MCA NIMCET Previous Year PYQ MCA NIMCET NIMCET 2009 PYQ

Solution

Microprogrammed control units are slower than hardwired units but make it easy to add or modify instructions.

MCA NIMCET PYQ
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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MCA NIMCET Previous Year PYQ MCA NIMCET NIMCET 2008 PYQ

Solution

11001100 + 10001111 = 1 01011011
Carry-out occurs → C = 1
Signed overflow occurs → V = 1
Result is not zero → Z = 0

MCA NIMCET PYQ
The main disadvantage of direct mapping of cache organization is that





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MCA NIMCET Previous Year PYQ MCA NIMCET NIMCET 2008 PYQ

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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