Interview Questions Engineers Struggle to answer.

Most of them barring one or two are technical questions rather than logical , so I am not able to grasp  them all.. But I guess it should not be difficult for Engineering graduates !

I too could not understand some questions.  May be some engineering graduates able to answer some. I'm a science graduate. Very less knowledged in Engineering subjects.

This is out of my reach so it's better to leave it for the techs but I wonder, how did they fail in solving it? 

All Engineering graduates may not behaving same caliber. I know some very meritorious Engineering Graduates fumble in interviews simply out of nervousness and fear. This is what I guess.