Question { IBM, 12949 }

Bird is flying 120 km/hr between B to R. Two trains at B to R
at 60 kmph. The distance traveled by the bird
before it is killed?

Answer

Each train steams at 60 kph, so the distance between them closes at the rate of 120 kph.
They are 60 km apart when our saga begins, so the crash occurs after (60/120) = 1/2 hour.
The bird flies at 120 kph, so logs 60 km in the 1/2 hour before it expires in the fiery collision.

Question { 32810 }

what is tandem isolator ??????????

Answer

It is a isolator where the three pole phases are aligned
digonally ie. all the pole phases are connected one behind
another so that the jumpering can be done on the bus bar