Q.

For a NAND gate, struck-at 1 fault in second input line cannot be detected if

A. q is 1
B. q is 0
C. q changes from 1 to 0
D. q changes from 0 to 1
Answer» B. q is 0
Explanation: in a nand gate, struck-at 1 fault in the second input line cannot be detected if the output q is reset (q=0) prior to applying the test sequence.
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